Answers
Answer:
maximum width of the doorway = 35.77ft
Explanation:
The detailed calculation and derivation from first principle is as shown in the attachment
Answer:
the maximum width is x= 4√2 ft = 5.656 ft
Explanation:
for the parabola
y= a*x² + b*x + c
where y= height and x= width
an aircraft hangar should be symmetric with respect to the y axis , then
y(-x)=y(x) → a*x² + b*x + c = a*x² - b*x + c →-2*b*x =0 → b=0
it also should be pointing downwards → a is negative
, then the parabola would be
y= c- a*x²
since c= maximum height = 18 ft
then for y=0 , x= 48 ft/2 = 24 ft → 0 = 18 ft - a*(24 ft)² → a= 1/32 ft⁻¹
then
y= 18 ft- 1/32 ft⁻¹ *x²
since the doorway cannot go beyond the parabola , the maximum possible doorway is obtained when the doorway touches the parabola.
then for a height y= 8 ft
8 ft = 18 ft- 1/32 ft⁻¹ *x²
x= 4√2 ft = 5.656 ft
Related Questions
An object falls a distance h from rest. If it travels 0.540h in the last 1.00 s, find (a) the time and (b) the height of its fall.
Answers
Answer
given,
distance of fall = h
initial speed = 0 m/s
it travels 0.540 h in the last 1.00 s
Speed of the fall = [tex]\dfrac{Distance}{time}[/tex]
Speed = [tex]\dfrac{0.540\ h-0}{1}[/tex]
S = 0.540h m/s
time of the fall
using equation of motion
v = u + g t
0.540 h = 0 + 9.8 t
t = 0.055h s
The time of fall is equal to 0.055h s
height of fall = ?
again using equation of motion
v² = u² + 2 g s
(0.540h)² = 0 + 2 x 9.8 x s
s = 0.0148 h²
Hence, the time of fall of the object = 0.055h s.
the distance of fall of object = 0.0148 h²
The object has been falling for a total time of 3.13 seconds and the total height from which it fell is 47.9 meters, given that it covered 0.540 of its total height in the last 1 second of free fall.
Explanation:Solution for Time and Height of a Free-Falling ObjectLet's tackle this physics problem step by step to find both the time the object has been falling and the total height from which it fell. We'll use the known acceleration due to gravity (g = 9.81 m/s²) and apply kinematic equations.
Given that the object travels 0.540h in the last 1.00 s, we can set up two equations using the kinematic formula h = ½gt², where h is the height, g is the acceleration due to gravity, and t is the time in seconds:
Total height fallen (h) after time t: h = ½g(t²)Height fallen in the last 1 second (0.540h): 0.540h = ½g(t²) - ½g((t-1)²)We solve the second equation for t, which will then be used to find the total height using the first equation.
Solving the second equation: 0.540h = ½g(t²) - ½g((t-1)²)
Expand and simplify the equation: 0.540h = ½g(t²) - ½g(t² - 2t + 1)
0.540 = t² - ½g(t² - 2t + 1)
Now, assuming g is approximately 9.8 m/s², we can plug in values and solve for t:
0.540 = t² - 0.5(9.81)(t² - 2t + 1)
After solving for t, we find:
(a) Total time of fall, t = 3.13 s(b) Total height fallen, h = 0.5(9.81)(3.13²) = 47.9 mThis calculation assumes that air resistance is negligible and the acceleration due to gravity is constant.
Astronomers have no theoretical explanation for the ""hot Jupiters"" observed orbiting some other stars. (T/F)
Answers
Answer:
Astronomers have no theoretical explanation for the ""hot Jupiters"" observed orbiting some other stars.
False
Explanation:
The “hot Jupiters” joint word startes to be used to be able to describe planets like 51 Pegasi b, a planet with a 10-day-or-less orbit and a mass 25% or greater than Jupitere, circling a sun-like star planet in 1995, which was found by astronomers Michel Mayor and Didier Queloz, who were awarded the 2019 Nobel Prize for Physics along with the cosmologist James Peebles for their “contributions to our understanding of the evolution of the universe and Earth’s place in the cosmos.”
Now we know a total of 4,000-plus exoplanets, but only a few more than 400 meet the definition of the enigmatic hot Jupiters which, tell us a lot about how planetary systems form, and what kinds of conditions cause extreme results.
In a 2018 paper in the Annual Review of Astronomy and Astrophysics, astronomers Rebekah Dawson of the Pennsylvania State University and John Asher Johnson of Harvard University reviewed on how hot Jupiters might have formed, and would be the meaning for the rest of the planets in the galaxy.
A hot-water bottle contains 715 g of water at 51∘C. If the liquid water cools to body temperature (37 ∘C), how many kilojoules of heat could be transferred to sore muscles?
Answers
Answer:
[tex]Q=41.90kJ[/tex]
Explanation:
The heat lost by the water in the cooling process is transferred to the muscles. Therefore, we must calculate this water lost heat, which is defined as:
[tex]Q=mc\Delta T[/tex]
Where m is the water's mass, c is the specific heat capacity of the water and [tex]\Delta T=T_f-T_0[/tex] is the change in temperature. Replacing the given values:
[tex]Q=715g(4186\frac{J}{g^\circC}})(51^\circ C-37^\circ C)\\Q=41901.86J\\Q=41.90kJ[/tex]
A bar extends perpendicularly from a vertical wall. The length of the bar is 2 m, and its mass is 10 kg. The free end of the rod is attached to a point on the wall by a light cable, which makes an angle of 30° with the bar. Find the tension in the cable.
Answers
Answer:
T = 98.1 N
Explanation:
Given:
- mass of bar m = 10 kg
- Length of the bar L = 2 m
- Angle between Cable and wall Q = 30 degres
Find:
- Find the tension in the cable.
Solution:
- Take moments about intersection of bar and wall, to be zero (static equilibrium)
(M)_a = 0
T*sin( 30 )*L - m*g*L/2 = 0
T*sin(30) - m*g / 2 = 0
T = m*g / 2*sin(30)
T = 10*9.81 / 2*sin(30)
T = 98.1 N
In a single wire, how much current would be required to generate 1 Tesla magnetic field at a 2 meter distance away from the wire?
Answers
Answer:
12.56 A.
Explanation:
The magnetic field of a conductor carrying current is give as
H = I/2πr ............................... Equation 1
Where H = Magnetic Field, I = current, r = distance, and π = pie
Making I the subject of the equation,
I = 2πrH............... Equation 2
Given: H = 1 T, r = 2 m.
Constant: π = 3.14
Substitute into equation 2
I = 2×3.14×2×1
I = 12.56 A.
Hence, the magnetic field = 12.56 A.
A large box of mass M is pulled across a horizontal, frictionless surface by a horizontal rope with tension T. A small box of mass m sits on top of the large box. The coefficients of static and kinetic friction between the two boxes are μs and μk, respectively.Find an expression for the maximum tension T max for which the small box rides on top of the large box without slipping.
Answers
Answer:
Explanation:
Given
Mass of big box is M and small box is m
Tension T will cause the boxes to accelerate
[tex]T=(M+m)a[/tex]
where a=acceleration of the boxes
Now smaller box will slip over large box if the acceleration force will exceed the static friction
i.e. for limiting value
[tex]\mu _smg=ma[/tex]
[tex]a=\mu _s\cdot g[/tex]
thus maximum tension
[tex]T=\mu _s(M+m)g[/tex]
An electric motor rotating a workshop grinding wheel at a rate of 44.2 rev/min is switched off with a constant deceleration of 2.69 rad/s 2 . How long does it take for the grinding wheel to stop?
Answers
Answer: time(t) = 1.72s
Explanation: [tex]Angular acceleration =\frac{angular velocity}{time taken}[/tex]
Let angular acceleration = α = [tex]2.69rad/s^{2}[/tex]
ω = angular velocity = 44rev/ min
the angular velocity is in rev/ min but we need to have it in rad/s , thus we do so below
recall that 1 rev = 2π and 1 min = 60s, [tex]\frac{44.2 * 2\pi }{60} \\\\ \frac{44.2 * 2*3.142}{60} \\\\= 4.63rads^{-1}[/tex]
hence 44.2rev/min = 44.2 * 2π/ 60 = 44.2 * 2 *3.142/ 60
thus angular velocity = 4.63rad/s
time taken = angular velocity/ angular acceleration
time taken = 4.63/2.69
time taken = 1.72s
Calculate the magnitude of the gravitational force exerted by the Moon on a 79 kg human standing on the surface of the Moon. (The mass of the Moon is 7.4 × 1022 kg and its radius is 1.7 × 106 m.)
Answers
Answer:
F= 134.92 N
Explanation:
Given that
The mass of the moon ,M = 7.4 x 10²² kg
The mass of the man ,m = 79 kg
The radius ,R= 1.7 x 10⁶ m
The force exerted by moon is given as
[tex]F=G\dfrac{Mm}{R^2}[/tex]
Now by putting the values in the above equation we get
[tex]F=6.67\times 10^{-11}\times \dfrac{79\times 7.4\times 10^{22}}{(1.7\times 10^6)^2}\ N\\F=134.92 N[/tex]
Therefore the force will be 134.92 N.
F= 134.92 N
A cylindrical shell of radius 7.1 cm and length 251 cm has its charge density uniformly distributed on its surface. The electric field intensity at a point 25.2 cm radially outward from its axis (measured from the midpoint of the shell ) is 37400 N/C.(a) What is the net charge on the shell?
(b) What is the electric field at a point 4.07 cm from the axis? The value of Coulomb’s constant is 8.99 × 10^9 N • m^2/C^2.
Answers
Answer:
0.00000131569788654 C
0
Explanation:
R = Radius = 7.1 cm
L = Length of shell = 251 cm
r = 25.2 cm
E = Electric field = 37400 N/C
Electric field is given by
[tex]E=\dfrac{2kq}{rL}\\\Rightarrow q=\dfrac{ErL}{2k}\\\Rightarrow q=\dfrac{37400\times 0.252\times 2.51}{2\times 8.99\times 10^{9}}\\\Rightarrow q=0.00000131569788654\ C[/tex]
The net charge on the shell is 0.00000131569788654 C
Here, 4.07<7.1 cm which means r'<R
From Gauss law the electric at that point is 0
During a braking test, a car is brought to rest beginning from an initial speed of 60 mi/hr in a distance of 120 ft. With the same constant deceleration, what would be the stopping distance s from an initial speed of 80 mi/hr?
Answers
Using physics principles and the kinematic equation, the problem calculates the stopping distance of a car decelerating from 80 mi/hr, based on known stopping distance at 60 mi/hr. It involves converting speeds and applying algebraic manipulation to solve for the new distance.
Explanation:To solve the problem of finding the stopping distance from an initial speed of 80 mi/hr, given the stopping distance from 60 mi/hr is 120 ft, we use the principle of physics that relates deceleration, distance, and speed. This approach requires converting speeds from miles per hour to feet per second, applying the kinematic equation v² = u² + 2as, and solving for the unknown stopping distance.
First, speeds are converted from miles per hour to feet per second. Given the initial situation: a car decelerates from 60 mi/hr to rest over 120 feet. Converting 60 mi/hr to feet per second gives 88 feet per second (using 1 mi = 5280 feet and 1 hour = 3600 seconds). Applying v² = u² + 2as (where v is final speed, u is initial speed, a is acceleration, and s is stopping distance) allows us to calculate the deceleration using the initial conditions. Next, using the same deceleration, we calculate the stopping distance from 80 mi/hr (converted to feet per second).
The detailed calculation involves algebraic manipulation of the kinematic equation to solve for the new stopping distance using the derived constant deceleration from the 60 mi/hr case. It demonstrates how a car's stopping distance increases with a square of the speed, illustrating the critical relationship between speed, stopping distance, and safety.
The stopping distance from an initial speed of 80 mi/hr would be approximately 195.555 ft, assuming the same constant deceleration as the first scenario.
To find the stopping distance from an initial speed of 80 mi/hr, we first need to determine the acceleration of the car during braking. Using the initial velocity of [tex]60 mi/hr[/tex] and the stopping distance of 120 ft, we can calculate the acceleration using the kinematic equation:
[tex]\[ v_f^2 = v_i^2 + 2as \][/tex]
Given that [tex]\( v_f = 0 \)[/tex] (the car comes to rest), [tex]\( v_i = 60 \) mi/hr, and \( s = 120 \)[/tex]ft, we rearrange the equation to solve for [tex]\( a \)[/tex]:
[tex]\[ a = \frac{{v_f^2 - v_i^2}}{{2s}} \][/tex]
Substituting the values:
[tex]\[ a = \frac{{0 - (60 \, \text{mi/hr})^2}}{{2 \times 120 \, \text{ft}}} \]\[ a \approx -33.333 \, \text{ft/s}^2 \][/tex]
Now, using this acceleration value, we can find the stopping distance[tex](\( s \))[/tex] from an initial speed of 80 mi/hr. With [tex]\( v_i = 80 \) mi/hr[/tex], we convert it to feet per second and use it in the same kinematic equation:
[tex]\[ v_i = 80 \, \text{mi/hr} \times 1.46667 \, \text{ft/s/mi/hr} = 117.333 \, \text{ft/s} \]\[ s = \frac{{-(117.333 \, \text{ft/s})^2}}{{2 \times (-33.333 \, \text{ft/s}^2)}} \]\[ s \approx 195.555 \, \text{ft} \][/tex]
Therefore, the stopping distance from an initial speed of [tex]80 mi/hr[/tex]would be approximately 195.555 ft, assuming the same constant deceleration as the first scenario.
Quickly spinning the handle of a hand generator, Kevan is able to light three bulbs in a circuit. When he uses two batteries instead of the generator, the bulbs are very dim. Which statement best explains why the batteries are not able to power all three light bulbs like the generator?a. The batteries do not make the charges move as muchb. The generator creates less voltagec. The batteries have higher amperaged. The generator current is more steady
Answers
The batteries do not make the charges move as much as the hand generator. This is because batteries store energy chemically, and depending on their properties, they may not provide enough energy to power all the bulbs in the circuit. In contrast, hand generators can generate a higher voltage due to a greater induced EMF from rapid movement in a magnetic field.
Explanation:The best explanation for this phenomenon is that 'the batteries do not make the charges move as much' as compared to the hand generator. Hand generators work on the principle of electromagnetic induction where the rapid movement of a coil in a magnetic field can induce a substantial electromotive force (emf). This high emf allows the generator to power more light bulbs in a circuit. This is because the faster the generator is spun, the greater the induced emf, which in turn produces a higher voltage.
On the other hand, the batteries store energy as a chemical reaction waiting to happen, not as electric potential. This reaction only runs when a load is attached to both terminals of the battery. Hence, depending on the energy storage and discharge properties of the battery used, they may not be able to provide enough energy to sufficiently power all the bulbs in a circuit, especially if they are made to power more than one bulb simultaneously. Hence, in the case of the two batteries, they are not able to cause the charges to move as much as the hand generator, and this results in a lower voltage and consequently dimmer lights.
Learn more about Electromagnetic Inductionhttps://brainly.com/question/32444953
The description for a certain brand of house paint claims a coverage of 475 ft²/gal.
(a) Express this quantity in square meters per liter.
(b) Express this quantity in an SI unit.
(c) What is the inverse of the original quantity?
Answers
Answer:
(a) 11.66 square meters per liter
(b) 11657.8 per meters
(c) 0.00211 gal per square feet
Explanation:
(a) 475ft^2/gal = 475ft^2/gal × (1m/3.2808ft)^2 × 1gal/3.7854L = 11.66m^2/L
(b) 475ft^2/gal = 475ft^2/gal × (1m/3.2808ft)^2 × 264.17gal/1m^3 = 11657.8/m
(c) Inverse of 475ft^2/gal = 1/475ft^3/gal = 0.00211gal/ft^3
a third resistor is added in parallel with the first two.
(picture shows 2 resistors connected in parallel to battery)
What happens to the current in the battery?
A. remains the same
B. increases
C. decreases
What happens to the terminal voltage of the battery?
A. remains the same
B. increases
C. decreases
Answers
Answer:
C.
A
Explanation:
Question 1
When a third resistor is added in parallel to the first two. The effective resistance of the circuit increases R_eq. When the resistance is increased in a circuit while the battery provides a constant voltage the current decreases as per Ohm's Law:
I = V / R_eq
Current and effective resistance are inversely proportional. Hence, the current in the battery decreases.
Question 2
The terminal voltage remains the same because the amount of push required to move electrons in a path remains same. Adding more paths would not require more push, unless resistance is added in the same path i.e series. Hence, terminal voltage of the battery remains the same.
Final answer:
Adding a third resistor in parallel decreases the total resistance and increases the current drawn from the battery, but the terminal voltage of the battery ideally remains the same.
Explanation:
When a third resistor is added in parallel with the first two resistors across a battery, the total resistance of the circuit is reduced. According to Ohm's law, the total current ('I') drawn from the battery is equal to the voltage ('V') divided by the total resistance ('R'), as in the formula I = V/R. When the total resistance decreases due to the addition of another resistor in parallel, the total current provided by the battery increases. Therefore, the current in the battery increases.
As for the terminal voltage of the battery, it remains the same assuming the battery is ideal. In an ideal circuit, adding additional resistors in parallel does not change the voltage across the resistors; they all share the same potential difference as that of the battery. Real-world batteries, however, may experience a slight drop in terminal voltage due to internal resistance, but this effect is typically ignored in basic circuit analysis.
A series of parallel linear water wave fronts are traveling directly toward the shore at 15.5 cm/s on an otherwise placid lake. A long concrete barrier that runs parallel to the shore at a distance of 3.10 m away has a hole in it. You count the wave crests and observe that 75.0 of them pass by each minute, and you also observe that no waves reach the shore at ±62.3cm from the point directly opposite the hole, but waves do reach the shore everywhere within this distance.A) How wide is the hole in the barrier?B) At what other angles do you find no waves hitting the shore?
Answers
Answer: (a) 62.9cm
Explanation: see attachment below
At standard temperature and pressure (0 ∘C∘C and 1.00 atmatm ), 1.00 molmol of an ideal gas occupies a volume of 22.4 LL. What volume would the same amount of gas occupy at the same pressure and 25 ∘C∘C ?
Answers
Answer:
Final volume will be 24.45 L
Explanation:
We have given initial temperature [tex]T_1=0^{\circ}C=0+273=273K[/tex]
Pressure is [tex]P_1=1atm[/tex]
Volume occupied [tex]V_1=22.4lL[/tex]
From ideal gas equation [tex]PV=nRT[/tex]
[tex]\frac{PV}{T}=constant[/tex]
So [tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
Final temperature [tex]T_2=25+273=298K[/tex]
Pressure is remain constant so [tex]P_2=1atm[/tex]
We have to fond the volume [tex]V_2[/tex]
So [tex]\frac{1\times 22.4}{273}=\frac{1\times V_2}{298}[/tex]
[tex]V_2=24.45L[/tex]
So final volume will be 24.45 L
What fraction of the copper's electrons has been removed? Each copper atom has 29 protons, and copper has an atomic mass of 63.5.
Answers
Answer:
9.09*10^-13
Explanation:
Certain values of the problem where omitted,however the omitted values were captured in the solution.
Step1:
Avogadro's number (NA) I = 6.02*10^23 atoms/mole.
Step2:
To determine the number of moles of copper that are present, thus: Using the mass and atomic mass :
n = m/A
n = 50.0g/63.5g/mol
Therefore, since the are 29 protons per atom, I the number of protons can be determined as follows :
Np = nNA*29 protons /atom
Np=(50.0gm/63.5g/mol)(6.02*10^23 atoms/mol) * (29 protons / C u atom)
Np= 1.375*10^25 protons
Note that there are same number of electrons as protons in a neutral atom, I therefore the removal of electrons to give the copper a net change, hence the result is 1.375*10^25
Step3:
To determine the number electrons , removed to leave a net charge of 2.00Uc, then remove -2 .00Uc of charge, so that the number of electrons to be removed are as follows :
Ne(removed)=
Q/qe= -2.00*10^-6c/-1.60* 10^-19c
Ne(removed)=1.25*10^13 electrons removed
Step4:
To calculate the fraction of copper's electron by taking the ratio of the number of electrons initially present:
Ne,removed/Ne,initially=1.25*10^13/ 1.37*10^25 = 9.09*10^-13
A simple elevator ride can teach you quite a bit about the normal force as this rider below can (hopefully) tell you. There are three different scenarios given, detailing the rider\'s experience in an unnamed hotel. For each scenario, calculate the normal force, FN,1-3, acting on the rider if his mass is m = 76.6 kg and the acceleration due to gravity g = 9.81 m/s2. In scenario 1, the elevator has constant velocity. In scenario 2 the elevator is moving with upward acceleration a2 = 4.84 m/s2. Finally, in scenario 3, unfortunately for the rider, the cable breaks and the elevator accelerates downward at a3 = 9.81 m/s2.
FN1= ___________
FN2= ___________
FN3= ___________-
Answers
Answer:
FN1 = 751.5 N
FN2 = 1122.2 N
FN3 = 0
Explanation:
Scenario 1 :
The elevator has constant velocity.The normal force, can adopt any value, as needed by Newton's 2nd Law, in order to fit this general expression:
Fnet = m*a
In the first scenario, as the elevator is moving at a constant speed, this means that no external net force is present.
The two forces that act on the rider, are gravity (always present, downward) and the normal force, as follows:
Fnet = Fn - m*g = m*a
For scenario 1:
Fnet = 0 ⇒ Fn = m*g = 76.6 kg * 9.81 m/s² = 751. 5 N
Scenario 2In this scenario, the elevator has an upward acceleration of 4.84 m/s², so the Newton's 2nd Law is as follows:
Fnet = FN - m*g = m*a
⇒ FN = m* ( g+ a) = 76.6 kg* (9.81 m/s² + 4.84 m/s²) = 1,122.2 N
Scenario 3As the elevator is in free fall, this means that a = -g, so, in this condition, the normal force is just zero, as it can be seen from the following equation:
FN-mg = m*a
If a = -g,
⇒ FN -mg = -mg ⇒ FN=0
Final answer:
The normal forces for a person in an elevator are as follows: in scenario 1 with constant velocity, it is 751.686 N; in scenario 2 with upward acceleration, it is 1122.59 N; and in scenario 3 during free fall, it is 0 N.
Explanation:
The question requires us to calculate the normal force acting on a person in an elevator under different scenarios using Newton's second law.
Scenario 1: Constant Velocity
In scenario 1, since the elevator is moving with a constant velocity, the acceleration is 0 [tex]m/s^2[/tex], so the normal force ([tex]FN_1[/tex]) will be equal to the weight of the person. That is:
[tex]FN_1[/tex] = m * g = 76.6 kg * 9.81 [tex]m/s^2[/tex] = 751.686 N
Scenario 2: Upward Acceleration
In scenario 2, the elevator is accelerating upward, so the normal force ([tex]FN_2[/tex]) will be more than the weight of the person. The equation will be:
[tex]FN_2[/tex] = m * (g + a2) = 76.6 kg * (9.81 [tex]m/s^2[/tex] + 4.84 [tex]m/s^2[/tex]) = 76.6 kg * 14.65 [tex]m/s^2[/tex] = 1122.59 N
Scenario 3: Downward Acceleration (Free Fall)
In scenario 3, since the cable breaks, the elevator and the person inside will be in free fall, thus experiencing the same acceleration downward as the acceleration due to gravity. This means there will be no normal force acting on the person ([tex]FN_3[/tex] = 0 N) because they are in free fall.
A rock is thrown with a velocity v0, at an angle of α0 from the horizontal, from the roof of a building of height h. Ignore air resistance. Calculate the speed of the rock just before it strikes the ground, and show that this speed is independent of α0.
Answers
Answer:
[tex]V=\sqrt{V_{0}^{2}+2gy}[/tex]
Explanation:
Data given,
[tex]velocity,v =v_{0}\\ angle =\alpha _^{0}[/tex]
since the motion part is describe by a projectile motion, the acceleration along the horizontal axis is zero
Hence using the equation v=u+at we have the following equation ,
the velocity along the horizontal axis to be
[tex]V_{x}=V_{0}cos\alpha _{0} \\[/tex]
the velocity along the vertical axis to be
[tex]V_{y}=V_{0}sin\alpha _{0}-gt \\[/tex]
the magnitude of this velocity can be determine using Pythagoras theorem
[tex]V^{2}=V_{x}^{2} +V_{y} ^{2}[/tex]
if we substitute the expressions we have
[tex]V^{2}=V_{0}^{2}cos\alpha _{0}^{2} +(V_{0}sin\alpha _{0}-gt)\\expanding \\V^{2}=V_{0}^{2}(cos\alpha _{0}^{2}+sin\alpha _{0}^{2})-2gtsin\alpha _{0}+(gt)^{2}\\(cos\alpha _{0}^{2}+sin\alpha _{0}^{2})=1\\V^{2}=V_{0}^{2}-2gtsin\alpha _{0}+(gt)^{2}\\[/tex]
[tex]V^{2}=V_{0}^{2}-2gtV_{0}sin\alpha _{0}+(gt)^{2}\\V^{2}=V_{0}^{2}-2g(V_{0}sin\alpha _{0}-\frac{1}{2}gt^{2} )\\V_{0}sin\alpha _{0}-\frac{1}{2}gt^{2}=distance=y\\V^{2}=V_{0}^{2}-2gy\\ for upward \\V^{2}=V_{0}^{2}+2gy\\V=\sqrt{V_{0}^{2}+2gy}[/tex]
The speed of the rock, just before it strikes the ground (maximum speed) can be given as,
[tex]v=\sqrt{v_0^2-2gh} \\[/tex]
Witch is independent to angle [tex]a_0[/tex].
What is speed of the object just before hitting the ground?The speed of the object falling from a height achieved the maximum speed, just before hitting the ground.
Given information-
The rock is thrown with a velocity [tex]v_0[/tex].
The rock is thrown with a angle of [tex]a_0[/tex].
The height of the building is [tex]h[/tex].
The height of the building can be given as,
[tex]h=v_0\times\sin(a_0)-\dfrac{1}{2}gt[/tex] .........1
Let the above equation as equation 1,
The horizontal velocity of the rock can be given as,
[tex]v_h=v_0\times\cos (a_0)[/tex].
The vertical velocity of the rock can be given as,
[tex]v_v=v_0\times\sin(a_0)-gt[/tex]
Here, [tex]g[/tex] is the gravitational force and [tex]t[/tex] is time.
Now the magnitude of the velocity can be given as,
[tex]v=\sqrt{v_h^2+v_v^2} \\v=\sqrt{(v_0\times\cos(a_0))^2+(v_0\times\sin(a_0)-gt)^2} \\v=\sqrt{v_0^2\times\cos^2(a_0)+v_0^2\times\sin(a_0)^2+(gt)^2-2gtv_0\times\sin(a_0)} \\v=\sqrt{v_0^2(\cos^2(a_0)+\times\sin(a_0)^2)-2g(v_0\times\sin(a_0)-\dfrac{1}{2}gt^2} \\v=\sqrt{v_0^2(1)-2g(v_0\times\sin(a_0)-\dfrac{1}{2}gt^2} \\[/tex]
Put the values of [tex]h[/tex] from equation 1 to the above equation as,
[tex]v=\sqrt{v_0^2-2gh} \\[/tex]
Hence the speed of the rock, just before it strikes the ground (maximum speed) can be given as,
[tex]v=\sqrt{v_0^2-2gh} \\[/tex]
Witch is independent to angle [tex]a_0[/tex].
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What is the normal condition for atoms? What is an excited atom? What are orbitals?
Answers
An atom in normal conditions refers when electrons are in the fundamental state. When you leave the atom, an electron absorbs energy from an external source and moves to a higher energy state.
Energy states or energy levels are called orbitals. The difference between the energy states in an atom is responsible for the emission of photons when an electron transition occurs between these two energy states.
Because the energy levels are discrete, the emitted photons also possess different energies.
A book rests on the shelf of a bookcase. The reaction force to the force of gravity acting on the book is 1. The force of the shelf holding the book up. 2. The force exerted by the book on the earth. 3. The weight of the book. 4. The frictional force between book and shelf. 5. None of these.
Answers
Answer: the force exerted by the book on the earth
The reaction force to the force of gravity acting on a book resting on a shelf is the force exerted by the shelf, also known as the normal force. This force counteracts the force of gravity and is equal to the weight of the book. Understanding this concept requires knowledge of Newton's Second and Third Laws of Motion.
Explanation:The reaction force to the force of gravity acting on a book resting on a shelf is the Force exerted by the shelf on the book. The shelf applies a Normal force, perpendicular to its surface, that counteracts the force of gravity pulling down on the book. This is directly tied into Newton's Third Law, which states that for every action, there is an equal and opposite reaction.
The normal force exerted by the shelf is a type of contact force and is exactly equal to the weight of the book (which is the force of gravity acting on the book). If the normal force were weaker, the book would begin to sink into the shelf. If it were stronger, the book would start to lift off of the shelf. Frictional force also plays a role here, preventing the book from sliding off the shelf, but it is not the reaction force to gravity in this case. Newton's Laws of Motion, particularly the Second and Third Laws, are key to understanding these dynamics.
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A helium-filled weather balloon has a 0.90 m radius at liftoff where air pressure is 1.0 atm and the temperature is 298 K. When airborne, the temperature is 210 K, and its radius expands to 3.0 m. What is the pressure at the airborne location
Answers
Answer:
0.019 atm
Explanation:
Assume ideal gas, so PV/T is constant where P is pressure, V is volume and a product of radius R cubed and a constant C, T is the temperature
[tex]\frac{P_1V_1}{T_1} = \frac{P_2V_2}{T_2}[/tex]
[tex]P_2 = P_1\frac{V_1}{V_2}\frac{T_2}{T_1}[/tex]
[tex]P_2 = P_1\frac{CR_1^3}{CR_2^3}\frac{T_2}{T_1}[/tex]
[tex]P_2 = P_1\left(\frac{R_1^3}{R_2^3}\right)^3\frac{T_2}{T_1}[/tex]
[tex]P_2 = 1\left(\frac{0.9}{3}\right)^3\frac{210}{298}[/tex]
[tex]P_2 = 0.3^3*0.7 = 0.019 atm[/tex]
The student's question about the change in pressure of a helium-filled weather balloon as it expands and cools at altitude can be answered using the ideal gas law. By comparing initial and final conditions of pressure, volume, and temperature, and using the equation P2 = P1V1T2 / (T1V2), the new pressure can be determined.
Explanation:The student is asking how to determine the pressure inside a helium-filled weather balloon when it rises to an altitude where the external conditions change. We are given the initial temperature, pressure, and radius of the balloon at liftoff, and the radius at its airborne location where the external temperature has decreased. To solve this problem, the ideal gas law is used in combination with the assumption that the balloon expands isotropically (uniformly in all directions). Since the internal pressure of the balloon must balance the external air pressure plus the pressure due to the tension in the balloon's material, we need to use a modified version of the ideal gas law that accounts for changes in temperature and volume to find the new pressure.
Given that the temperature and volume of the balloon change upon reaching altitude, if the volume and temperature of a gas are changed and the amount of gas (number of moles) remains constant, the ideal gas law (PV = nRT) can be rearranged to show the relationship between initial and final states:
P1V1/T1 = P2V2/T2
Where P1, V1, and T1 are the initial pressure, volume, and temperature and P2, V2, and T2 are the final pressure, volume, and temperature, respectively. Since we know all variables except for P2, we can solve for P2 by rearranging the equation to:
P2 = P1V1T2 / (T1V2)
However, it is important to note that we must convert the volumes from radius measurements to actual volumes using the formula for the volume of a sphere, V = (4/3)πr3, and we must use absolute temperatures in Kelvin.
Using this equation with the provided values (making sure to convert units where necessary), the student will be able to determine the pressure at the airborne location for the weather balloon.
A charge of 12.6 µC is at the geometric center of a cube. What is the electric flux through one of the faces? The permittivity of a vacuum is 8.85419 × 10−12 C 2 /N · m2 . Answer in units of N · m2 /C.
Answers
The electric flux through one of the faces of the cube with the charge at its geometric center can be found using Gauss's Law. The electric flux enclosed by the surface divided by the permittivity of the medium is 1.424 N·m2/C.
Explanation:We can use Gauss's Law to determine the electric flux through one of the faces of the cube with the charge at its geometric center. Gauss's Law states that the electric flux through a closed surface is equal to the charge enclosed by that surface divided by the permittivity of the medium.
The charge enclosed by one face of the cube is 12.6 µC. The permittivity of a vacuum is 8.85419 × 10-12 C2/N·m2.
Therefore, the electric flux through one face of the cube is (12.6 µC) / (8.85419 × 10-12 C2/N·m2) = 1.424 N·m2/C.
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A photographer uses his camera, whose lens has a 50mm focal length, to focus on an object 5.0m away. He then wants to take a picture of an object that is 60cm away.
How far must the lens move to focus on this second object?
Answers
Answer:
f₂ = 0.019 m
Explanation:
Let's analyze this exercise a bit, when taking a picture the image should always be in the same place, position of the CCD, let's use the builder's equation to find this distance from the image (i)
1 / f = 1 / o + 1 / i
Where f is the focal length and "o, i" are the distances to the object and image, respectively
1 / i = 1 / f - 1 / o
Let's reduce the magnitudes to the SI system
f = 50 mm = 0.050 m
o = 5.0 m
Let's calculate
1 / i = 1 / 0.050 - 1 / 5.0 = 20- 0.2 = 19.8
i = 0.020 m
Now the object is 60 cm, rotates the lens and has a new focal length
o₂ = 60 cm = 0.60 m
1 / f = 1 / 0.60 + 1 / 0.020 = 1.66 + 50 = 51.66
f₂ = 0.019 m
An electron and a proton are separated by a distance of 1 m. What happens to the size of the force on the first electron if a second electron is placed next to the proton?
Answers
Answer:
The force on the electron will become zero.
Explanation:
As electron has negative charge and proton has positive charge. The magnitude of charge on both particles is equal. Therefore, there will be a force of attraction between electron and proton. When another electron is brought near the proton the net charge in that area will become equal to zero. Therefore, first electron will not experience any force.
Final answer:
The original force between the first electron and proton remains unchanged when a second electron is placed next to the proton, but the first electron will experience an additional repulsive force from the second electron. This alters the net force acting on the first electron but does not directly change the force between it and the proton.
Explanation:
The question inquires about the effect on the force on an electron when a second electron is placed next to a proton, with all particles separated by a distance of 1 meter.
According to Coulomb's Law, which governs the electrostatic force between two charged particles, the force is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.
When a second electron is placed next to the proton, this setup introduces additional forces: a repulsive force between the two electrons and an attractive force between the new electron and the proton.
However, the original question seems to focus on how the force on the first electron changes with this new arrangement. The presence of a second electron does not alter the magnitude of the force between the first electron and the proton directly since the forces here are evaluated pairwise, and the distance between them remains unchanged.
What changes, though, is the overall electrical environment, introducing a new set of forces that need to be considered for the complete system. The addition of the second electron introduces a repulsive force on the first electron, which is separate from but concurrent with the attractive force from the proton.
It is important to consider the net force acting on any charge in such scenarios, which would involve adding vectorially the attractive force from the proton and the repulsive force from the second electron.
Thus, while the force due to the proton-electron pair remains constant, the first electron experiences an additional repulsive force due to the second electron, affecting the net force on it but not the force between it and the proton directly.
In terms of the variables in the problem, determine the time, t, after the launch it takes the balloon to reach the target. Your answer should not include h.
Answers
Answer:
[tex]t=\dfrac{d}{v_0cos(\theta )}[/tex]
Explanation:
The background information:
A student throws a water balloon with speed v0 from a height h = 1.8m at an angle θ = 29° above the horizontal toward a target on the ground. The target is located a horizontal distance d = 9.5 m from the student’s feet. Assume that the balloon moves without air resistance. Use a Cartesian coordinate system with the origin at the balloon's initial position.
The time it takes for the balloon to reach the target is equal to the target distance [tex]d[/tex] divided by the horizontal component of the velocity [tex]v_0[/tex]:
[tex]t=\dfrac{d}{v_x}[/tex]
where [tex]v_x[/tex] is the horizontal component of the velocity [tex]v_0[/tex], and it is given by
[tex]v_x=v_0cos(\theta)[/tex];
Therefore, we have
[tex]\boxed{t=\dfrac{d}{v_0cos(\theta)} }[/tex]
The time it takes for the balloon to reach the target can be found by solving the equation x = xo + vot + at². By rearranging the equation and substituting the given values, the time can be determined. For example, if the balloon has an initial vertical velocity of 21.2 m/s and lands 10.0 m below its starting altitude, it will spend 3.79 s in the air.
The time it takes for the balloon to reach the target, denoted by t, can be determined by the vertical motion of the balloon. The equation x = xo + vot + at² can be used to solve for t, since the only unknown in the equation is t.
By rearranging the equation and substituting the given values, we can solve for t.
For example, if the balloon has an initial vertical velocity of 21.2 m/s and lands 10.0 m below its starting altitude, it will spend 3.79 s in the air.
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An airplane is flying with a velocity of v0 at an angle of α above the horizontal. When the plane is a distance h directly above a dog that is standing on level ground, a suitcase drops out of the luggage compartment.
Part A
How far from the dog will the suitcase land? You can ignore air resistance.
Take the free fall acceleration to be g.
Answers
Final answer:
To find how far the suitcase lands from the dog, one must calculate the time it takes for the suitcase to hit the ground using its vertical motion and multiply that time by the horizontal component of its initial velocity, with no need to consider air resistance.
Explanation:
To determine how far from the dog the suitcase will land, we need to break down the initial velocity of the suitcase (v0) into its horizontal (vx) and vertical components (vy). The flight time of the suitcase is primarily determined by its vertical motion, governed by the equation y = vyt + 0.5gt2, where y is the vertical displacement (in this case, equal to -h since the suitcase is falling down), t is the time, and g is the acceleration due to gravity. Since we ignore air resistance, the horizontal velocity remains constant throughout the flight. Therefore, the horizontal distance d from the dog can be found using d = vxt.
To extract the horizontal (vx) and vertical (vy) components of the initial velocity v0, we use the equations: vx = v0cos(α) and vy = v0sin(α). Finally, solving for t using the vertical motion equation and substituting it into the horizontal distance equation gives us the required distance d.
A 975-kg elevator accelerates upward at 0.754 m/s2, pulled by a cable of negligible mass. Find the tension force in the cable.
Answers
To solve this problem we will apply the concepts of equilibrium and Newton's second law.
According to the description given, it is under constant ascending acceleration, and the balance of the forces corresponding to the tension of the rope and the weight of the elevator must be equal to said acceleration. So
[tex]\sum F = ma[/tex]
[tex]T-mg = ma[/tex]
Here,
T = Tension
m = Mass
g = Gravitational Acceleration
a = Acceleration (upward)
Rearranging to find T,
[tex]T = m(g+a)[/tex]
[tex]T = (975)(9.8+0.754)[/tex]
[tex]T= 10290.15N[/tex]
Therefore the tension force in the cable is 10290.15N
Technician A says a change in circuit resistance will change the amount of current in the circuit. Technician B says a change in circuit voltage will change the amount of current in the circuit. Who is right?
Answers
Answer:
Both technician A and B are right
Explanation:
According to ohm's law current flowing in a circuit is equal to [tex]i=\frac{V}{R}[/tex], here i is current V is voltage and R is resistance of the circuit
From the relation we can see that current in the circuit is dependent on both voltage and resistance
So if we change the resistance then current also changes and if we change the resistance then also current changes
So both Technician A and B are right
The gravitational force exerted by a proton on an electron is 2x1039 times weaker than the electric force that the proton exerts on an electron? True or False? explain.
Answers
To solve this problem we will rely on the theorems announced by Newton and Coulomb about the Gravitational Force and the Electrostatic Force respectively.
In the case of the Force of gravity we have to,
[tex]F_g = G\frac{m_pm_e}{d^2}[/tex]
Here,
G = Gravitational Universal Constant
[tex]m_p[/tex] = Mass of Proton
[tex]m_e[/tex] = Mass of Electron
d = Distance between them.
[tex]F_g = (6.673*10^{-11} kg^{-1} \cdot m^3 \cdot s^{-2}) (\frac{(1.672*10^{-27}kg)(9.109*10^{-31})}{(52.9pm)^2})[/tex]
[tex]F_g = 3.631*10^{-47}N[/tex]
In the case of the Electric Force we have,
[tex]F_e = k\frac{q_pq_e}{d^2}[/tex]
k = Coulomb's constant
[tex]q_p[/tex] = Charge of proton
[tex]q_e[/tex] = Charge of electron
d = Distance between them
[tex]F_e = (9*10^9N\cdot m^2 \cdot C^{-2})(\frac{(1.602*10^{-19}C)(1.602*10^{-19}C)}{(52.9pm)^2})[/tex]
[tex]F_e = 82.446*10^{-9}N[/tex]
Therefore
[tex]\frac{F_e}{F_g} = 2.270*10^{39}[/tex]
We can here prove that the statement is True
It has been proved in below calculation that the gravitational force exerted by a proton on an electron is [tex]2\times10^{39}[/tex]times weaker than the electric force that the proton exerts on an electron
What is gravitational force?Gravitational force is the universal force of attraction acting between two bodies.
It is given by,
[tex]Fg=G\times\dfrac{m_1 \times m_2}{x^2}[/tex]
Here [tex]G[/tex] is gravitational constant [tex]m[/tex] is the mass of the bodies and [tex]x[/tex] is the distance between bodies.
What is electric force?Electric force is the force of attraction or repulsion acting between two charged bodies,
[tex]F_E=k\times\dfrac{q_1 \times q_2}{x^2}[/tex]
Here, [tex]k[/tex] is Coulomb's constant [tex]q[/tex] is the charge and [tex]x[/tex] is the distance between bodies.
The gravitational force exerted by a proton on an electron is,
[tex]Fg=6.673\times{10^{-11}}\times\dfrac{1.673\times10^{-27}\times9.1094\times10^{-31}}{x^2}[/tex]
The electric force exerted by a proton on an electron is,
[tex]F_E=9\times{10^{9}}\times\dfrac{1.602\times10^{-19}\times1.602\times10^{-19}}{x^2}[/tex]
Compare both,
[tex]\dfrac{F_g}{F_e} =\dfrac{6.673\times{10^{-11}}\times\dfrac{1.673\times10^{-27}\times9.1094\times10^{-31}}{x^2}}{9\times{10^{9}}\times\dfrac{1.602\times10^{-19}\times1.602\times10^{-19}}{x^2}}\\\dfrac{F_g}{F_e} =\dfrac{1}{2\times10^{39}}[/tex]
Thus, It has been proved in below calculation that the gravitational force exerted by a proton on an electron is [tex]2\times10^{39}[/tex]times weaker than the electric force that the proton exerts on an electron.
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The plates of a parallel-plate capacitor are 3.00 mm apart, and each carries a charge of magnitude 79.0 nC. The plates are in vacuum. The electric field between the plates has a magnitude of 5.00 x 10^6 V/m.
Part A) What is the potential difference between the plates?Part B) What is the area of each plate?Part C) What is the capacitance?
Answers
To solve this problem we will apply the concepts of the potential difference such as the product between the electric field and the distance, then we will use two definitions of capacitance, the first depending on the Area and the second depending on the load to find the Area. Finally we will look for capacitance with the values already obtained in the first sections of this problem
PART A) Potential Difference is
[tex]V = Ed[/tex]
Here,
E = Electric Field
d = Distance
Replacing,
[tex]V = (5*10^6)(3.0*10^{-3})[/tex]
[tex]V = 15000V= 15kV[/tex]
PART B) Capacitance of the capacitor is
[tex]C = \frac{\epsilon_0 A}{d}[/tex]
Here,
A = Area
[tex]\epsilon_0[/tex] = Permittivity Vacuum
d = Distance
Rearranging to find the Area we have,
[tex]A = \frac{Cd}{\epsilon_0}[/tex]
We know at the same time that Capacitance is the charge per Voltage, then
[tex]C = \frac{Q}{V}[/tex]
Replacing at this equation we have that
[tex]A = \frac{Qd}{V\epsilon_0}[/tex]
[tex]A = \frac{(79*10^{-9})(3*10^{-3})}{(15000)(8.853*10^{-12})}[/tex]
[tex]A = 1.78mm^2[/tex]
PART C)
Capacitance is given by,
[tex]C = \frac{Q}{V}[/tex]
[tex]C =\frac{79*10^{-9}}{15000}[/tex]
[tex]C =5.26pF[/tex]