Answer:
6 bub
Explanation:
Lifting a heavy box and placing it on a table increases its potential energy due to the work done against gravity. The box remains stationary with this added potential energy. If the box were to fall, this potential energy would be converted into kinetic energy as it accelerates towards the ground.
When you lift an object such as a heavy box and place it on a table, if the box remains stationary, it means that you have changed its energy state. Specifically, you have increased its potential energy. Potential energy is the energy stored in an object as a result of its position or height. For example, in Physics, lifting a 20 kg box of books through a vertical distance of 2m would involve an energy expenditure of approximately 400 J, signifying that the box gained 400 J of potential energy. This energy transfer occurs because of the work done against gravity: applying a force to lift the object off the ground increases its potential energy. Once the object is released, if it falls, the stored potential energy is converted into kinetic energy as it accelerates towards the ground due to the force of gravity.
It is important to note that while lifting the object, if it is done slowly so that the box's speed does not change significantly, the kinetic energy of the object remains constant (nearly zero if lifted slowly enough), although its potential energy increases. This concept is exemplified when an object is lifted using a device powered by chemical energy, such as a gasoline engine; the chemical energy is converted into gravitational energy, which is then stored in the object as potential energy. When it comes to work and energy, the work done on an object adds to its total energy. If that work is done to lift an object against the force of gravity, it is stored as potential energy.
An object has 16N of force being applied to the right, 16N of force being applied to the left, and 4N of force being applied downward. What is the net force on the object?
Answer: 4N downward
Explanation: If 16N is applied on both the right and left then the object isn't moving either way, so we are left with 4N.
"The net force on the object is 4N downward.
To find the net force acting on the object, we need to consider the vector sum of all the individual forces. Forces acting in opposite directions (to the right and to the left in this case) will cancel each other out.
Given the forces:
- 16N to the right
- 16N to the left
- 4N downward
Since the forces to the right and to the left are equal in magnitude (16N), they will cancel each other out. This leaves us with only the downward force to consider for the net force.
Therefore, the net force [tex]\( F_{net} \)[/tex]is simply the downward force:
[tex]\[ F_{net} = 4N \text{ (downward)} \][/tex]
The horizontal components of the force (to the right and to the left) have no net effect on the object's motion because they are equal and opposite, so they sum to zero in the horizontal direction. The only unbalanced force is the 4N acting vertically downward. Hence, the net force on the object is 4N downward."
9. An 800 kg police boat slows down uniformly from 50 km/h [E] to 20 km/h (E) as it enters a
harbour. If the boat slows down over a 30 m distance, what is the force of friction on the boat?
(Hint: You will need to convert the velocities into m/s.)
Answer:
2,158N
Explanation:
According to the second newtons law of motion, Force(F) = mass(m) × acceleration (a)... 1
Given mass to be 800kg.
We need to get the acceleration of the body using one of the equations of motion.
v²= u²+2as ... (2)where;
v = final velocity = 50km/hr
u = initial velocity = 20km/hr
a is the acceleration
s is the distance covered by the boat = 30m
Converting 50km/hr and 20km/hr to m/s, this gives us
50km×1000m/1hr×3600s
= 50000/3600
= 13.9m/s
Similarly,
20km/hr = 20000m/3600s
= 5.6m/s
Substituting this values into the equation 2 to get acceleration, we have
13.9²= 5.6²+2a(30)
193.21 = 31.36+60a
60a = 193.21-31.36
60a = 161.85
a = 2.69m/s²
To get the force on the both we substitute the value of mass and acceleration in equation 1
F =ma
F = 800×2.69
F= 2,158N
Therefore the force of friction on the boat is 2,158N
A clear echo is heard within 0.2 seconds when a person shouts by sitting at the ridge of a hill. Calculate the velocity of sound in air. The distance between the person and the hill is 33.2 m
To calculate the velocity of sound in air using the given information, we'll use the formula:
Speed=(distance)/(Time).Therefore, the velocity of sound in air is 332m/s.
To calculate the velocity of sound in air using the given information, we'll use the formula:
Speed=(distance)/(Time)
Given:
Time taken for the echo(t) = 0.2 seconds
Distance between the person and the hill(d) = 33.2 meters
Firstly, recognize that the sound traveled twice the distance (to the hill and back) to create the echo.
So, the actual distance the sound traveled is 2×distance=2×33.2meters=66.4meters.
Next, use the formula for speed:
Speed=(distance)/(Time)
Speed=(66.4m)/(0.2s)
Speed=332m/s
Therefore, the velocity of sound in air is 332m/s.
Which statements describe the Mercalli scale? Check all that apply.
Which statements describe the Mercalli scale? Check all that apply.
A. This scale measures seismic waves based on their size.
B. This scale rates an earthquake according to how much damage it causes.
C.This scale produces a single rating for earthquakes that reach the surface.
D. This scale uses Roman numerals to rank the damage caused by an earthquake.
E.This scale measures the magnitude of an earthquake based on the size of seismic waves.
Answer:The Mercalli scale : This scale rates an earthquake according to how much damage it causes and This scale uses Roman numerals to rank the damage caused by an earthquake.
Explanation:The Modified Mercalli scale is intended to illustrate the consequences of an earthquake, at a contracted station, on tangible characteristics, on modern fittings and human beings.
The Modified Mercalli Intensity value ascribed to a particular site subsequent an earthquake has an extra significant means of severity to the nonscientist than the magnitude because intensity assigns to the outcomes really encountered at that position. This scale is comprised of 12 growing levels of intensity, denoted by Roman numerals, arranging from gradual shaking to catastrophic impairment.
Why is it easy to get one empty cart moving but difficult to get a line of 20 empty carts moving?
Answer:
It is easier to move empty cart than of moving 20 empty carts because of surface that can affect balancing the carts in same array which makes the carts of array to move in different directions.
Final answer:
It's easier to get one empty cart moving than 20 because a single cart has less inertia and friction to overcome compared to the combined inertia and friction of 20 carts.
Explanation:
The question you've asked pertains to the subject of physics, specifically the principles of inertia and momentum. Inertia is the tendency of an object to resist changes to its state of motion. When you have one empty cart, the inertia is relatively low compared to a line of 20 empty carts. Therefore, it requires less force to get one cart moving than 20 carts because the combined inertia of all the carts is greater, hence more force is needed to overcome it.
In addition to inertia, frictional forces also play a part. Each cart adds its own frictional resistance to the total system. Thus, when you try to push 20 carts, you're trying to overcome the frictional force of 20 sets of wheels on the surface as opposed to just one. This makes it substantially more difficult to get the line of carts moving compared to just one cart.
7. What causes waves to bend?
Answer:
Refraction
Explanation:
Refraction is the change in direction of waves that occurs when waves travel from one medium to another. Refraction is always accompanied by a wavelength and speed change. Diffraction is the bending of waves around obstacles and openings.
Waves bend or 'refract' when they move from one medium to another and change speed. This bending is impacted by the properties of the mediums and the angle of the incident wave. A common example is the apparent bending of a stick immersed in water, which we see as a result of light wave refraction.
Explanation:The bending of waves, whether light, sound, or oceanic, is primarily caused by a phenomenon known as refraction. Refraction occurs when a wave moves from one medium to another, causing a change in speed and resulting in bending of the wave. A typical example of this is the apparent bending of a stick when it is partially immersed in water; what we're seeing is the refraction, or bending, of light waves as they move from water to air.
The extent of bending, or refraction angle, depends on the nature and properties of the transmitting mediums and the incident wave angle. When waves cross the boundary between different mediums at an angle, one side of the wave changes speed before the other, causing the wave to bend towards the medium that slows it down.
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What is anaerobic exercise?
Answer:
A Brief burst of intense exercise
Explanation:
Apex
In this section of a circuit, a current of 5.0 A flows across R1. Find the potential difference between point a and point b. Let R1 = 3.0 ohm, R2 = 8.0 ohm, and R3 = 10.0 ohm.
B) 37 V
The potential difference between point a and point b is equal to 37 V
Explanation:
The potential difference across a and b can be calculated by finding the equivalent resistance of the resistors R1, R2 and R3 and then by applying Ohm's law.
Given:
R1 = 3.0 Ω
R2 = 8.0 Ω
R3 = 10.0
Current = I = 5 A
To calculate equivalent resistance of the circuit:
R2 and R3 are connected in parallel configuration. The equivalent resistance of R2 and R3 can be calculated as
[tex]\frac{1}{R_p} =\frac{1}{R_2} + \frac{1}{R_3} \\\\\frac{1}{R_p}=\frac{1}{8} + \frac{1}{10}= \frac{5+4}{40} = \frac{9}{40} \\\\ \frac{1}{R_p}=\frac{9}{40} \\\\R_p=\frac{40}{9}\ ohms[/tex]
Resistance R1 is in series with Rp. The equivalent series resistance is calculated as
[tex]R_s = R1+R_p = 3+\frac{40}{9}= \frac{27+40}{9} = \frac{67}{9} = 7.44\ ohms[/tex]
Thus the given 3 resistor circuit can be written as an equivalent resistance Rs equal to 7.44 Ω through which current I passes.
By Ohm's law;
If V is the potential difference between a and b
Potential difference across points a and b = Current flowing through the circuit × Resistance between points a and b
[tex]V = I\times R_s = 5\times 7.44 = 37.2\ V[/tex]
37.2 V ≈ 37 V
Therefore, the potential difference between point a and point b is equal to 37 V
Answer:
Explanation:
37V
What is the gravitational force between two objects, one with a mass 2.0×10^4 kg and the second with a mass of 3.0×10^4 kg, that are 1.5 M apart?(G=6.673
Answer: A. 1.77x10-² N
Explanation: Newton's Law of Universal gravitation is expressed in the following formula:
F= G x ( m1 x m2 ) / r²
= 6.673x10-¹¹ N.m²/kg² ( 2.0x10⁴ kg x 3.0x10⁴ kg) / (1.5m )²
= 0.0177 N or 1.77x10-² N
A construction worker drags a box across the floor. If the frictional force between the floor and the box is 12.2 newtons, how much work does friction do as the box moves 11.5 meters?
The work done is 140.3 J
Explanation:
The work done is defined as the amount of force required or used to move an object over a particular distance. Hence, work done is the product of force in Newton and the distance in which the object moved in meters. Here, in the question, it is given that there is a frictional force acting on the box by the floor and the distance it moves. Hence, to get the answer to multiply frictional force and the distance. So, will get the work done as 140.3 J.Final answer:
The work done by the frictional force as the box moves 11.5 meters is -140.3 joules, indicating the force is opposing the box's motion.
Explanation:
To calculate the work done by friction as a box moves across a floor, we need to use the equation for work, which is work done (W) = force (f) × distance (d) × cos(θ), where θ is the angle between the force and the direction of motion. Since friction always acts opposite to the direction of motion, the angle θ here is 180 degrees, and cos(180°) is -1. Therefore, the work done by the frictional force is negative, indicating that it's in the opposite direction to the displacement of the box.
The frictional force between the box and the floor is given as 12.2 newtons, and the box moves 11.5 meters. Substituting the given values into the work equation gives:
W = f × d × cos(180°) = 12.2 N × 11.5 m × (-1) = -140.3 joules.
The negative sign indicates that the work done by the frictional force is in the opposite direction of the displacement, meaning it resists the motion of the box.
QUESTION 2
Sally and Bill are on identical swings. (Fill in "Sally", "Bill", or "Neither" into the fields)
Assume they weigh the same: If Sally is pushed harder than Bill,
________ would come back sooner, _______
has a greater amplitude.
Assume Bill is heavier than Sally: If both are pushed equally hard,
_______would come back sooner,______
has a greater amplitude
Assume they weigh the same: If Sally is pushed harder than Bill, Bill would come back sooner, Bill has a greater amplitude. Assume Bill is heavier than Sally: If both are pushed equally hard, Bill would come back sooner, Sally has a greater amplitude
Explanation:
The amplitude of a wave refers to the maximum amount of displacement of a particle on the medium from its rest position. In a sense, the amplitude is the distance from rest to crest. Similarly, the amplitude can be measured from the rest position to the trough position.
In simpler terms, amplitude stands for the maximum extent of a vibration or oscillation, measured from the position of equilibrium. Amplitude is proportional to the energy of a wave, a high energy wave having a high amplitude and a low energy wave having a low amplitude.
Can you think of a device or machine that transfers the motion of a hot gas to motion of an object?
Answer:
Turbines in coal factories
Explanation:
Turbines in coal factories use steam power to move the turbine flaps and generate static electricity as energy output.
Explanation:
a machine or a device that transfers the motion of a hot gas to motion of an object is a rocket ship.
A baseball travels a distance of 20 meter at a speed of 25m/s. How much time did it take?
The baseball takes 0.8 s to travel a distance of 20 m at a speed of 25 m/s.
Explanation:
It is known that speed is the rate at which any object covers a particular distance.
So [tex]speed =\frac{\text { distance }}{\text { time }}[/tex]
Hence, it is known that speed is directly proportional to distance covered and inversely proportionate to the time taken to cover this distance.
Similarly, the time taken by any object to cover a distance is directly proportionate to the distance and inversely proportionate to the velocity of the object.
As the distance is given as 20 m and speed is given as 25 m/s, then the time can be easily obtained by finding the ratio of distance to speed.
Here,
[tex]\text { Time }=\frac{\text {distance}}{\text {speed}}=\frac{20}{25}=0.8 \mathrm{s}[/tex]
Thus, the baseball takes 0.8 s to travel a distance of 20 m at a speed of 25 m/s.
Which particle is a form of antimatter?
A. hydrogen-1
B. photon
C. positron
D. neutrino
Answer:
C. positron
Explanation:
Antimatter particles bind with each other to form antimatter, just as ordinary particles bind to form normal matter. For example, a positron (the antiparticle of the electron) and an antiproton (the antiparticle of the proton) can form an antihydrogen atom.
There you go.
Answer:C. positron
Explanation:
Earth is surrounded by a magnetic field because of
Earth is surrounded by a magnetic field because of the rotating electric currents by the charged metallic particles in the earth crest.
What is earth's magnetic field ?On earth, electric currents are produced by the movement of liquid metal in the planet's outer core. These electric currents combine to create a magnetic field that surrounds the globe as a result of Earth rotating on its axis.
The magnetic field is crucial to keeping life on Earth alive. Without it, we would be exposed to a lot of solar radiation and our atmosphere would be unrestricted in its ability to escape into space.
A stream of charged particles emerging from the sun, interacts with the magnetic field that stretches from the interior of the earth into space. Electric currents caused by the movement of convection currents of a combination of molten iron and nickel in the earth's outer core produce the magnetic field.
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A train traveling at 27.5 m/s accelerates to 42.4 m/s over 75.0 s. What is the displacement of the train in this time period
Answer:
2621.25 meters
Explanation:
First, write down what we are given.
Initial velocity = 27.5 m/s
Final velocity = 42.4 m/s
Time = 75 seconds
We need to look at the kinematic equations and determine which one will be best. In this case, we need an equation with distance. I am going to use [tex]v_{f}^{2} = v_{i}^{2} +2ad[/tex], but you can also use the other equation, [tex]x = v_{o}t+\frac{1}{2}at^{2}[/tex]
We need to find acceleration. To find it, we need to use the formula for acceleration: [tex]a = \frac{v_{f}-v_{i}}{t}[/tex]. Plugging in values, [tex]a = \frac{42.4-27.5}{75} = .199\ m/s^{2}[/tex]
Next, plug in what we know into the kinematics equation and solve for distance. [tex]42.4^{2} = 27.5^{2} + 2(.199)(d)\\d = 2621.25\ meters[/tex]
If the speed of an object were to triple, what would be the increase of kinetic energy?
KE↓2=_____KE↓1
1. 1/3
2. 1/9
3. 3
4. 9
Answer:
4. 9
Explanation:
For instance, if the speed of an object becomes double, its kinetic energy changes to four times the initial kinetic energy.Similarly, if the speed of the object triples the kinetic energy becomes nine times the initial kinetic energy.
Therefore the answer is 9.
Which of the following is a property of all periodic waves?
A. They follow a repeating pattern as they propagate.
B. They oscillate in a direction perpendicular to the direction in which they propagate.
C. They tend to propagate in a circle.
D. They always return to the same place.
Answer: Option A. They follow a repeating pattern as they propagate
Explanation:
the presence of which magnetic feature best explains why a magnet can act a distance on other magnets or on objects containing certain metals
Answer:
Fields
Explanation:
The presence of a magnet's magnetic field best explains why a magnet can act at a distance on other magnets or objects containing certain metals. The magnetic field is an invisible force field that extends from the magnet, wherein other magnets or certain metals are influenced.
Explanation:The feature of a magnet that allows it to act at a distance on other magnets or on objects containing certain metals is its magnetic field. A magnet's magnetic field is an invisible force field that extends out from the magnet in a pattern similar to the pattern formed by evenly spaced, radiating lines. Within the magnetic field, other magnets or certain metals are pushed or pulled by the magnetic force. For example, if you slowly bring a piece of iron closer to a magnet, you will feel the iron being attracted towards the magnet even before it physically touches the magnet. That's the magnetic field in action.
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-A: Find the force that must be exerted on the rod to maintain a constant current of 0.156 A in the resistor? (In mN)
-B: What is the rate of the energy dissipation in the resistor? (In W)
-C: What is the mechanical power delivered to the rod? (In W)
A) Force: 0.0528 N
B) Power dissipated: 0.307 W
C) Power delivered: 0.307 W
Explanation:
A)
The force experienced by a current-carrying wire in a magnetic field is given by
[tex]F=ILB[/tex]
where
I is the current in the wire
L is the length of the wire
B is the strength of the magnetic field
In this problem, we have:
L = 0.451 m
B = 0.751 T
I = 0.156 A
Therefore, the force is
[tex]F=(0.156)(0.451)(0.751)=0.0528 N[/tex]
B)
The rate of energy dissipation in the resistor is the power dissipated in the resistor, and it is given by
[tex]P=I^2R[/tex]
where
I is the current in the resistor
R is the resistance
For the wire in this problem,
I = 0.156 A
[tex]R=12.6\Omega[/tex]
Therefore, the power dissipated is
[tex]P=(0.156)^2(12.6)=0.307 W[/tex]
C)
The mechanical power delivered to the rod is given by
[tex]P=VI[/tex]
where
V is the potential difference across the rod
I is the current in the rod
The potential difference across the rod must be equal to the potential difference across the resistance, which can be found by using Ohm's law:
[tex]V=RI=(12.6 \Omega)(0.156 A)=1.97 V[/tex]
Therefore, the power delivered to the rod is
[tex]P=(1.97 V)(0.156 A)=0.307 W[/tex]
This power is equal to the power dissipated on the resistor: this is due to the law of conservation of energy, in fact the total energy must remain constant, so here the electric energy is transformed into mechanical energy of motion of the rod.
8. If the speed of a wave is 1500 m/s and its frequency is 200 Hz, what is the wavelength?
formula for wavelength = speed/frequency
So 1500/200 = 7.5 meters
The wavelength of the wave is 7.5m.
What is Wavelength?The wavelength of light is described as "the distance between two consecutive peaks or troughs of a light wave" which is denoted by the Greek letter lambda (λ). Therefore, the distance between one crest or trough of one wave and the next wave is known as wavelength.
Wavelength can be expressed as:
[tex]\lambda=\frac{v}{f}\\\lambda = wavelength\\{v} = velocity\\{f} = frequency[/tex]
λ represents wavelength which is expressed in meters. The v is wave velocity that is calculated as meters per second (mps) and the f stands for frequency, which is measured in hertz (Hz).
For above given information,
speed of a wave is 1500 m/s
frequency is 200 Hz
So, wavelength= 1500/200= 7.5m
Thus, the wavelength of the wave is 7.5m.
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A crane uses an average force of 5,200 N to lift a girder 25 m. How much work does the crane do on the girder?
Answer: 130000 J
Explanation: Work is the product of force and distance.
W = F x d
= 5200 N x 25 m
= 130000 J
What relationship between the gravitational force and distance is shown in the graph above?
Answer:
The less distance between the objects, the more force there is between them.
Relationship between the gravitational force and distance shown in the graph is
>increases, decreases.
What is the relationship between force of gravity and distance?As most gravitons exist in a cloud around any object so when distance from the object increases, the density of the graviton cloud goes decreases. There is less gravitational attraction due to this.
The relationship between the force of gravity and distance between the objects is explained by inverse square law. This implies that the force of gravity between objects is inversely proportional to the square of the distance.
Any influence that causes an object to undergo a change is called force. Distance implies how far an object travels over a period of time. When the force applied is greater on an object, it will travel more distance.
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Does sand stay sand forever?
Answer:
No sand doesn't stay sand forever.
Explanation:
We may have a thought that the sand we see on the beach areas are always the same one for eternal, but it is not true.Due to different activities like beach nourishment, sand replenishment etc. the sand in the beach areas are changed and replaced.If the sand remained there for long time, it also affects the sand eating organisms and plants.Matter with a density that is less than water will____ when placed in a container of water?
Answer:
float
Explanation:
a less dense material will float when placed in a material that is more dense than itself. The reverse is also true, that a denser material will sink when placed into into a less dense material.
The amount of carbon dioxide released into the atmosphere is balanced by the release of:
A)nitrogen
B)carbon
C)oxygen
D)phosphorous
PLZZZZ hurry
Answer:
carbon
Explanation:
What is the difference between kinetic and potential energy and how do they work?
To explain, I will use the equations for kinetic and potential energy:
[tex]PE = mgh\\KE = \frac{1}{2}mv^{2}[/tex]
Potential energyPotential energy is the potential an object has to move due to gravity. An object can only have potential energy if 1) gravity is present and 2) it is above the ground at height h. If gravity = 0 or height = 0, there is no potential energy. Example:
An object of 5 kg is sitting on a table 5 meters above the ground on earth (g = 9.8 m/s^2). What is the object's gravitational potential energy? (answer: 5*5*9.8 = 245 J)
(gravitational potential energy is potential energy)
Kinetic energyKinetic energy is the energy of an object has while in motion. An object can only have kinetic energy if the object has a non-zero velocity (it is moving and not stationary). An example:
An object of 5 kg is moving at 5 m/s. What is the object's kinetic energy? (answer: 5*5 = 25 J)
Kinetic and Potential EnergySometimes, an object can have both kinetic and potential energy. If an object is moving (kinetic energy) and is above the ground (potential), it will have both. To find the total (mechanical) energy, you can add the kinetic and potential energies together. An example:
An object of 5 kg is moving on a 5 meter table at 10 m/s. What is the objects mechanical (total) energy? (answer: KE = .5(5)(10^2) = 250 J; PE = (5)(9.8)(5) = 245 J; total: 245 + 250 = 495 J)
How can you best identify quackery in a health service provider?
A. The provider does not provide success claims or testimonials.
B. The provider has only one doctor on staff.
O
C. The provider's success claims seem too good to be true.
O
D. The provider is not well known.
SUBMIT
Answer:
C. The provider's success claims seem too good to be true.
Find the momentum of a train with a mass of 850 kg and forward velocity of 15 m/s
Answer:
12,750
Explanation:
P = mv
Momentum = Mass x Velocity
Plug it in and finish equation
Answer:
P=12,750kgm/s
Explanation:
Momentum (P) = mass x velocity
Where velocity =15m/s
Mass=850kg
Therefore, momentum(P) = (850kg) x (15m/s)=12,750kgm/s
Hence,the momentum of the train is 12,750kgm/s
What is the final velocity of an object that is dropped if it falls a distance of 100 m?
Answer:
[tex]44.27m/s[/tex]
Explanation:
The kinematic equation
[tex]v_f^2=v_0^2+2ad[/tex]
gives the final velocity [tex]v_f[/tex] of the object given the initial velocity [tex]v_0[/tex], the acceleration [tex]a[/tex], and the distance traveled [tex]d[/tex].
For our case, the object is dropped; therefore,
[tex]v_0=0[/tex]
I.e. the initial velocity is zero. The acceleration due to gravity is
[tex]a=9.8m/s^2[/tex],
and the distance traveled is [tex]d=100m[/tex].
Putting the values into the equation we get:
[tex]v_f^2=0+2(9.8ms^{-2})(100m)\\\\v_f^2=1960\\\\v_f=\sqrt{1960} \\\\\boxed{v_f=44.27m/s}[/tex]
The final velocity of the object is 44.27 m/s.