Answer:
4.4 m
Explanation:
Given:
v = 0 m/s
a = -9.8 m/s²
t = 2.0 s
Find: Δy
Δy = vt − ½ at²
Δy = 0 − ½ (-9.8) (2.0)²
Δy = 4.4 m
Which option correctly identifies the graph that represents an object increasing its position with a constant velocity and describes why?
A --It is Graph D because a vertical line indicates the object is increasing its position, and a straight line means it is moving with a constant velocity.
B--It is Graph C because curving upward indicates the object is increasing its position, and a positive slope means it is moving with a constant velocity.
C--It is Graph A because a horizontal line indicates the object is moving with a constant velocity, and the positive value means it is increasing its position.
D--It is Graph B because a straight, diagonal line indicates the object is moving with a constant velocity, and a positive slope means it is increasing its position.
Answer: D
Explanation:
The graph that represents an object increasing its position with a constant velocity is Graph B because a straight, diagonal line indicates the object is moving with a constant velocity, and a positive slope means it is increasing its position. Hence, option (D) is correct.
What is velocity?The rate at which a body's displacement changes in relation to time is known as its velocity. Velocity is a vector quantity with both magnitude and direction. SI unit of velocity is meter/second.
Mathematically:
velocity = ( final position - initial position)/time interval
Hence,
Final position = initial position + velocity ×time interval
Hence, the x-t graph of a object with constant velocity, is linear in nature with a positive slope. Hence, graph (B) is the correct option.
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What is the gravitational force exerted on an object called?
Answer:
mass
Explanation:
The gravitational force exerted on an object is called its weight. Weight can change based on the strength of the gravitational pull where the object is located. The weight is calculated by multiplying the object's mass by the gravitational acceleration.
Explanation:The gravitational force exerted on an object is referred to as the object's Weight. This should not be confused with Mass, which is a measure of the amount of matter in an object and remains constant regardless of an object's location. Weight, however, can change depending on the gravitational pull of the surroundings. For instance, an object would weigh less on the moon than on Earth due to the moon's weaker gravitational pull.
Calculating the weight of an object is done by multiplying the mass of the object by the gravitational acceleration (approximately 9.8 m/s^2 on Earth). The typical unit of weight in the International System of Units (SI) is the Newton (N).
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A 0.250 kg mass is attached to a spring with k=18.9 N/m. At the equilibrium position, it moves 2.89 m/s. What is the amplitude of the oscillation? (Unit=m)
Answer: the frequency of the oscillation is given by ω=√(k/m)=√(18.9/2.5)=2.75. Keep in mind this is angular frequency, i.e. radians per second, not wavelengths per second. So the displacement can be written in the form
y = R*sin(2.75*t - δ)
Here δ is just the time offset and for our purposes is pretty irrelevant. You can in fact set it to zero since we can say we begin timing when the mass crosses equilibrium. So
y = R*sin(2.75*t)
We want to find a way to use the information "At the equilibrium position, it moves 2.89 m/s." I am going to use some calculus here since it makes things so much easier. If you haven't taken calculus yet, most likely your course has given you a formula to use instead.
We know y=0 when t=0, so y is at equilibrium when t=0. To say it moves 2.89 m/s is then to say that
y'(0) = 2.89.
From here we can differentiate the displacement function, set t=0 and solve for R. Using the chain rule:
y'(t) = 2.75*R*cos(2.75*t)
y'(0) = 2.75*R
2.75*R = 2.89
R = 1.051
Explanation: Since this is harmonic motion we can assume there is no damping force
Answer:
its .33
Explanation:
trust me
which of these changes does a submarine encounter as it returns from the bottom of the ocean to the surface of the ocean
Which changes?
Explanation:
What are your options?
What is the mechanical energy of a 1-kg ball that is rolling on the ground at 2 m/s?
A) The Ball is on the ground, so the mechanical energy is zero
B) 1J
C) 2J
D) 4J
NEED ANSWER ASAP
I will mark the answer brainliest
I literally copied the quiz
Answer:
c. 2 J
Explanation:
since u just multply it
Find Spearman's rank correlation coefficient between X and Y for this set of data:
X 13 20 22 18 19 11 10 15
Y 17 19 23 16 20 10 11 18
y= 2.52 - 14.10x
Explanation:
Form a table as shown below
x y x² y² xy
13 17 169 289 221
20 19 400 361 380
22 23 484 529 506
18 16 324 256 288
19 20 361 400 380
11 10 121 100 110
10 11 100 121 110
15 18 225 324 270
128 134 2184 2383 2265 sum
The formula for correlation is given by;
y=a + bx
a= ( ∑y)(∑x²) - (∑x)(∑xy) / n (∑x²)-(∑x)²
a=(134)(2184) - (128)(2265) / 8 (2184)-(128²)
a=292656 - 289920 / 17472-16384
a=2.515
b= n (∑xy) -(∑x)(∑y) / n (∑x²)-(∑x)²
b=8 (226) -(128)(134) / 8 (2184) - 128²
b=1808-17152 / 17472-16384
b= -14.10
The equation is thus;
y= a+bx
y= 2.52 - 14.10x
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Final answer:
To find Spearman's rank correlation coefficient for the given data, rank the values of X and Y, calculate the differences and squared differences of these ranks, and apply the Spearman's coefficient formula. A direct calculation cannot be provided without these intermediate steps. Spearman's correlation is appropriate for non-linear relationships.
Explanation:
To calculate Spearman's rank correlation coefficient between X and Y for the provided set of data, we must first rank the values of X and Y separately from lowest to highest and then compute the differences between the ranks for each pair of X and Y. After finding the squared differences of the ranks, we utilize the formula for Spearman's rank correlation coefficient:
rs = 1 - ( (6 ∑ d2 ) / (n(n2 - 1)) )
where d is the difference between the ranks of each pair and n is the number of pairs of scores. However, with the given information and without the ordered ranks and the differences of ranks, we cannot proceed to calculate the coefficient directly. We also need to note that if the variables show a curvilinear relationship or no clear linear relationship, Spearman's correlation would be a better measure of correlation than Pearson's.
The student should rank the values, compute the differences, square those differences, and substitute into the above formula to find Spearman's rank correlation coefficient.
What is the value of x in the equation Ix - 3y = 30, when y = 15?
Answer: x= 75
Explanation:1x -3y = 30
And y = 15
Substitute y accordingly into the equation, so that
x - 3(15) = 30
x-45=30
Add 45 to both sides if the equation
x-45+45=30+45
x=75
a 2.0 kg mass is lifted 4.0 m above the ground. find the change in gravitational energy
Answer:
78.4 J
Explanation:
Given:
Mass of the object (m) = 2.0 kg
Height or displacement of the mass (h) = 4.0 m
Now, change in gravitational potential energy (ΔU) = ?
Change in gravitational potential energy of an object is the energy stored by the object when it is raised to some height above the reference ground level.
Change in gravitational potential energy of an object of mass 'm' raised to a height 'h' above the ground is given as:
[tex]\Delta U=mgh[/tex]
Where, 'g' is the acceleration due to gravity and has a value of 9.8 m/s².
Now, plug in all the given values and solve for ΔU. This gives,
[tex]\Delta U=(2.0\ kg)(9.8\ m/s^2)(4.0\ m)\\\\\Delta U=78.4\ J[/tex]
Therefore, the change in gravitational potential energy is 78.4 J.
The change in gravitational energy when a 2.0 kg mass is lifted 4.0 m above the ground is [tex]\(78.4 \, \text{J}\)[/tex].
The change in gravitational potential energy [tex](\(\Delta U\))[/tex] when a mass \(m\) is lifted to a height [tex]\(h\)[/tex] is given by the formula:
[tex]\[\Delta U = m \times g \times h\][/tex]
where:
[tex]\(m\)[/tex] is the mass of the object (in kilograms),
[tex]\(g\)[/tex] is the acceleration due to gravity (approximately [tex]\(9.8 \, \text{m/s}^2\)[/tex] on Earth),
[tex]\(h\)[/tex] is the height above the ground (in meters).
Given:
[tex]\(m = 2.0 \, \text{kg}\)[/tex]
[tex]\(h = 4.0 \, \text{m}\)[/tex]
[tex]\(g \approx 9.8 \, \text{m/s}^2\)[/tex]
Plugging in the values:
[tex]\[\Delta U = 2.0 \, \text{kg} \times 9.8 \, \text{m/s}^2 \times 4.0 \, \text{m}\][/tex]
[tex]\[\Delta U = 78.4 \, \text{kg} \cdot \text{m}^2/\text{s}^2\][/tex]
Since [tex]\(1 \, \text{kg} \cdot \text{m}^2/\text{s}^2\)[/tex] is equivalent to [tex]\(1 \, \text{Joule}\) (J)[/tex], the change in gravitational potential energy is:
[tex]\[\Delta U = 78.4 \, \text{J}\][/tex]
3. If 2 J of wok is done in raising a 180 g apple, how far is it lifted?
Answer:
1.13m
Explanation:
From the question, we obtained the following information:
W = 2J
m = 180g
We must convert this gram (i.e 180g) to kg
1000g = 1Kg
180g = 180/1000 = 0.18kg
g = 9.8m/s2
h =?
w = mgh
h = w / mg
h = 2 / ( 0.18x9.8)
h = 1.13m
Volume (mL) Mass (g)
200 180
300 270
400 360
A liquid of unknown density is studied. Based on the data, what is the density of the liquid?
Group of answer choices
A 1.1 mL/g
B 0.9 mL/g
C 1.1 g/mL
D 0.9 g/mL
Answer:
A. 1.11[mL/g]
Explanation:
We have to remember the expression to calculate the density, which says it's the relationship between mass and volume.
We can calculate the different densities for each of the samples.
density1 = m/V = 200/180 = 1.11[mL/g]
density2 = m/V = 300/270 = 1.11[mL/g]
density3 = m/V = 400/270 = 1.11[mL/g]
According to the initial data, we can determine that the density corresponds to 1.11 [mL/g]
⚠Heeeeleleleeleleppppp⚠
Which phrase describes conduction?
A.Transfer of heat by the actual movement of warmed matter.
B.Transfer of heat between two objects that are touching.
C.The process in which energy is released by molecules breaking apart.
D.The process in which energy is emitted by one object, transmitted through space, and absorbed by another.
Yo sup??
the correct answer is option B ie
B. transfer of heat between two objects that are touching .
Hope this helps.
A cylinder contains 12liters of O2 at 20°c and 15atm. The temperature is raised to 35°c and volume is reduced to 8.5L. Calculate the final pressure. What will be the new pressure if the volume is doubled
Pressure : 11 atmosphere
Explanation:
According to gas equation P₁V₁/T₁ = P₂V₂/T₂
Where P₁ is the initial pressure , V₁ is the initial volume and T₁ is the initial temperature
P₂ is the final pressure , V₂ is the final volume and T₂ is the final temperature
Thus P₁ = 15 atmosphere , V₁ = 12 liters and T₁ = 273 + 20 = 293 K
P₂ = ? , V₂ = 8.5 liters , T₂ = 273 + 35 = 308 K
From gas equation P₂ = P₁V₁T₂/T₁V₂ = 15 x 12 x 308/ 293 x 8.5
= 22.3 atmosphere .
If the volume is doubled
The gas equation will be P₁V₁ = P₂V₂ ; because temperature is constant
Here V₂ = 2 V₁ therefore pressure P₂ = P₁/2 = 22.3/2 = 11.1 atmosphere
the force is the sum of all the forces that act upon an object
Answer:
net force
Explanation:
The net force is the vector sum of all the forces that act upon an object. That is to say, the net force is the sum of all the forces, taking into account the fact that a force is a vector and two forces of equal magnitude and opposite direction will cancel each other out.
Which of the following statements describe the transfer to energy?
1. Collisions of atoms causing nuclear reactions
2. A car speeding up from 5 mi/hr to 40 mi/hr
3. A transformer stepping down the voltage of electricity in power lines
4. A weightlifter lifting 100 lb. bell bar from his chest to a certain height
Answer: The answer is 1
Explanation:
because the atoms and nuclear
Find the momentum of a 25kg object traveling at a speed of 4m/s
Answer:
100Kg.m/s
Explanation:
From the question, we obtained the following information:
M= Mass = 25kg
V = Velocity = 4m/s
Momentum =?
Momentum = MV = 25x4= 100Kg.m/s
If you need some help working through family problems, who would be the best choice to seek it from?
clinical psychologist
counseling psychologist
sociocultural psychologist
developmental psychologist
Answer:
counseling psychologist
A rocket, weighing 4.36 x 10^4 N, has an engine that provides an upward force of 8.90 x 10^5 N. It reaches a maximum speed of 860 m/s. What is the NET force on the rocket
The net force on the rocket is 846400 N.
Answer:
Explanation:
It is known that weight is the influence of gravitational force acting on any mass of the object. So in the present case, the weighing force given is equal to the gravitational force acting on the rocket. Thus, the gravitational force will be acting towards downward direction. But an upward force is required by the rocket for thrusting purpose and that force is given as upward force. So the net force acting on the rocket is the vector addition of all the forces acting on the rocket. As in this case, only upward and downward force is acting on the rocket. The vector addition will be equal to subtraction of downward acting gravitational force from upward force or force provided by engine.
Net force = Engine force - Gravitational force = 890000-43600=846400 N
So the net force acting on the rocket is 846400 N.
Final answer:
The net force on the rocket is the difference between the upward thrust and the weight of the rocket. However, once the rocket reaches constant velocity, the net force is zero, assuming no changes in other forces acting on the rocket.
Explanation:
The net force on the rocket can be calculated using Newton's second law of motion, which states that the net force is equal to the mass times acceleration (F = ma). To find the net force, the weight of the rocket (gravitational force acting downward) needs to be subtracted from the upward thrust provided by the engine.
Fnet = Fthrust - Fweight
If we are not given the mass of the rocket or information about changes in the velocity to calculate acceleration, it's assumed that the rocket is in a constant velocity phase of its flight, meaning the net force equals to zero, since acceleration is zero. If acceleration were to be considered, it would've been calculable only with additional information pertaining to the time it takes to reach that velocity or change in velocity over time.
In the example provided, the weight of the rocket is 4.36 x 104 N and the thrust is 8.90 x 105 N. Once the rocket reaches its maximum speed, the acceleration is zero, and therefore the net force should also be zero as it will be cruising at a constant speed, provided there is no change in the forces acting on the rocket.
I need help with this problem. It’s calculating net force.
Answer:
The net force on the frog is zero Newton.
Explanation:
Balance forces are 2 forces that is acting in opposite directions on an object, and equal in size. Anytime there is a balanced force on an object, the object stays still or continues moving continues to move at the same speed and in the same direction
In Figure , the forces exerted on the frog is equal in magnitude and opposite in direction.
Hence
The force , F1 = 200 N and F2 = -200 N since it is acting in opposite direction
Now the net force =F1 + F2 = 200 - 200 = 0
A mass of 2 kg is hung off a spring,which extends 2 cm determine the energy stored in the spring?
The Energy stored in the spring is 0.196 joules(0.2 joule)
Here mass = 2.0 kg
the length for which the spring extended 'x' = 2 cm
since 1m =100cm, therefore 2cm will be equal to 0.02 m so x=0.02m
Acceleration due to gravity or 'g'= 9.8 m/s^2
We have to find E = ? joules
Solving for the spring constant k
F = kx
F=mg
Therefore,
mg = kx
k = mg / x
k = 2.0 kg * 9.8 m/s^2 / 0.02 m = 980 N / m
Solving for the energy stored in the spring
E = 1/2 * k * x^2
E = 1/2 * 980 N / m * (0.02 m)^2
E = 0.196 joules
The energy stored in the spring will be 0.196 joules.
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A lab assistant has been given data with units from an experiment to enter into the computer. Unfortunately, there are only numbers and no labels. Which of the
following could be a wavelength?
A. 10 m/s
B. 20 Hz
C. 30 cm
D. 40 s
Answer:
the answer ia A
Explanation:
The wavelength of the given data will be 30 cm since the unit of wavelength is meter or centimeter.
What is wavelength ?The distance between two successive troughs or crests is known as the wavelength. The peak of the wave is the highest point, while the trough is the lowest.
The wavelength is also defined as the distance between two locations in a wave that have the same oscillation phase.
The length of a wave is measured in its propagation direction. The wavelength is measured in meters, centimeters, nanometers, and other units since it is a distance measurement.
The relationship between the wave's wavelength, frequency, and speed is given as
[tex]\rm wavelength = \dfrac{speed of light} { frequency}[/tex]
Hence the wavelength of the given data will be 30 cm
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1) When you take a turn to the left in a car, you feel "thrown" to the right. Explain, using the
language of Newton's first law, how it is incorrect to say a force is responsible for this feeling.
Finish up by explaining what's actually going on.
2) Newton's third law states that for each force acting on a body (action), there is a force of
equal magnitude and opposite direction (reaction) acting on whatever generates the force on the
body. What is the reaction force to your weight?
Explanation:
1) Newton's first law of motion states: "an object in motion stays in motion, and an object at rest stays at rest, until acted upon by an unbalanced force."
When you're riding in a car, your body is moving forward. When the car turns left, your inertia keeps you moving forward. This means the car moves left from underneath you, which makes it feel like you're moving to the right, even though there's no net force pushing you.
2) When you're standing on the ground, the Earth's gravity pulls on you with a force equal to your weight. You push back on the Earth with an equal and opposite force called "normal force".
What is the current in a 120V circuit if the resistance 10?
Explanation:
V=IR; I=V/R
V=120V, R=10
I= 120/10=12
The current in the circuit is 12A
The current in a 120V circuit with a resistance of 10 ohms is 12 amperes, as calculated using Ohm's Law.
Explanation:To calculate the current in a 120V circuit with a resistance of 10 ohms, you can use Ohm's Law, which states that current (I) is equal to voltage (V) divided by resistance (R). Thus,
I = V / R
I = 120V / 10Ω
I = 12A
The current in the circuit is therefore 12 amperes (A).
Look at the incomplete equation below. What does E k Represent?
Answer:
The kinetic energy
Explanation:
The value of Ek represents the kinetic energy of a body and it is defined by the following equation
[tex]E_{k}=\frac{1}{2} *m*v^{2} \\[/tex]
where:
m = mass [kg]
v = velocity [m/s]
Ek = kinetic energy [J]
The equation [tex]\rm \(E_k = \frac{1}{2} m \times v^2\)[/tex] represents the kinetic energy [tex]\rm (\(E_k\))[/tex] of an object in motion. In this equation, [tex]\rm \(m\)[/tex] represents the mass of the object, and [tex]\rm \(v\)[/tex] represents its velocity.
Kinetic energy is the energy an object possesses due to its motion. The term [tex]\rm \(\frac{1}{2} m \times v^2\)[/tex] calculates the kinetic energy by taking half of the product of the object's mass and the square of its velocity.
As an object's speed increases, its kinetic energy also increases, and kinetic energy is directly proportional to both the mass and the square of the velocity of the object.
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The initial speed of a body is 7.1 m/s. What is its speed after 2.23 s if it accelerates uniformly at 2.64 m/s 2 ? Answer in units of m/s. What is its speed after 2.23 s if it accelerates uniformly at −2.64 m/s 2 ? Answer in units of m/s
The final speed of a body after 2.23 s with a positive acceleration of 2.64 m/s² is 12.988 m/s. With a negative acceleration of -2.64 m/s², the speed after 2.23 s is 1.212 m/s.
Explanation:To find out the speed of a body after 2.23 s when it accelerates uniformly, we need to use the formula for calculating final velocity (v) which is:
v = u + at, where:
For the first scenario with an acceleration of 2.64 m/s², we have:
v = 7.1 m/s + (2.64 m/s² × 2.23 s) = 7.1 m/s + 5.888 m/s = 12.988 m/s.
For the second scenario with an acceleration of -2.64 m/s² (which indicates deceleration), we have:
v = 7.1 m/s + (-2.64 m/s² × 2.23 s) = 7.1 m/s - 5.888 m/s = 1.212 m/s.
Therefore, the final speed after 2.23 s with a positive acceleration of 2.64 m/s² is 12.988 m/s, and with a negative acceleration (deceleration) of -2.64 m/s², the final speed is 1.212 m/s.
Storms are caused by. I WILL MARK BRAINLIEST
A. radiation
B. convection
C. conduction
D. hurricanes
Answer:convection
Explanation:
Convection can cause convection
Answer:
conduction is the answer
Explanation:
the particle in the atom with a negative charge is the blank
Answer:
the electron.
Explanation:
the atom has 3 types of particles: protons, neutrons, and electrons. protons have a positive charge, neutrons have a neutral charge, and they are both located in the nucleus. the electron is negatively charged, and it's located in the electron cloud, outside the nucleus.
Look at the data table and graph for the 50-coil electromagnet. With the 1.5 V battery, the electromagnet picked up an average of 13 paper clips, while the 25-coil electromagnet picked up an average of 6 paper clips.a.What is the ratio of the number of turns of the 50-turn electromagnet to the number of turns of the 25-coil electromagnet? b.What is the approximate ratio of the number of paper clips pickedup by the 50-coil electromagnet?
1) The ratio between the number of turns of the two electromagnets is 2
2) The ratio between the number of paper clips picked up is 2.2
Explanation:
1)
An electromagnet is a device consisting of a coil of wire wrapped around an iron core. Such a device is able to create a magnetic field, and in this problem this is used to attract and pick up the paper clips.
In this problem, we have two electromagnets:
- The first one has 50 turns
- The second one has 25 turns
Therefoore, the ratio of the number of turns of the 50-turn electromagnet to the number of turns of the 25-coil electromagnet is:
[tex]\frac{N_1}{N_2}=\frac{50}{25}=2[/tex]
2)
The strength of the magnetic field produced by an electromagnet is directly proportional to the number of turns in the coil wrapped on the electromagnet:
[tex]B\propto N[/tex]
This means that the electromagnet with more turns will produce a stronger magnetic field, and therefore it will be able to pickup more paper clips.
In this problem, in fact:
- The electromagnet with 50 turns can pick up 13 paper clips
- The electromagnet with 25 turns picks up 6 paper clips
Therefore, the ratio of the number of paper clips picked up is:
[tex]\frac{p_1}{p_2}=\frac{13}{6}=2.2[/tex]
And we see that this ratio is approximately equal to the ratio of the number of turns, which is 2.
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solve these please I really need help
The correct answer for 5 is Electrons
Choose each that apply
Which ones of the following are designed to interrupt the current flow of electricity when unsafe conditions arise
•gfcis(ground fault circuit interrupters
•transformers
•circuit breakers
•regulators
•fuses
Answer:
Circuit breakers
Explanation:
This is an automatic device designed for stopping the flow of current in an electric circuit as a safety measure.
Ground Fault Circuit Interrupters (GFCIs), circuit breakers, and fuses are designed to interrupt the current flow of electricity when unsafe conditions arise.
Explanation:Ground Fault Circuit Interrupters (GFCIs), circuit breakers, and fuses are all designed to interrupt the current flow of electricity when unsafe conditions arise. GFCIs are specifically designed to detect ground faults, which occur when current leaks to the ground, and they quickly shut off the power to prevent electric shocks. Circuit breakers monitor the current flowing through a circuit and trip when the current exceeds a certain threshold, protecting against overloads and short circuits. Fuses also protect against overloads and short circuits by melting and interrupting the current flow.
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Explain why a reference points that are stationary are usually chosen to determine whether an object is in motion.
Answer: Stationary reference points are used to determine if a object is in motion because if the reference point is still,you will be able to see if the object is in motion. If you had a reference point that wasn't stationary, you wouldn't be able to tell if the object was in motion.
Explanation:
Stationary reference points are used to determine if a object is in motion because if the reference point is still,you will be able to see if the object is in motion. If you had a reference point that wasn't stationary, you wouldn't be able to tell if the object was in motion.
Choosing a stationary reference point is important to determine motion because motion is relative and can appear differently from different reference frames.
Explanation:A stationary reference point is usually chosen to determine whether an object is in motion because motion is a relative term. When we observe motion from a reference point that is stationary, we can easily identify the displacement and velocity of the object. For example, if we are in a car that is moving at a constant velocity, it may be difficult to determine whether an object inside the car is moving or not. However, if we observe the same object from outside the car, from a stationary reference point, we can clearly see whether it is in motion or not.
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