Wednesday

April 16, 2014

April 16, 2014

Number of results: 118,978

**physics**

when something is dropped, its potential energy is turned into kinetic energy. as the object stops [as if it is bouncing back up and starting to slow to fall back down] kinetic energy decreases and becomes potential energy again. the energy of a system is the total kinetic ...
*Sunday, May 2, 2010 at 9:44pm by Kake*

**science 8th grade**

1. The thermal energy of an object is _____. (1 point) its potential energy its average kinetic energy its potential energy minus its kinetic energy its kinetic energy plus its potential energy Thanks, jessica :)
*Tuesday, April 9, 2013 at 8:05pm by jessie*

**Physics**

Find the potential energy given to the object when the rope is pulled to the side. This is just the height difference. The new distance from the ceiling is 1.5m * sin(35). The original distance was just the rope length (1.5m). Use mgh for the potential energy gained. Now, at ...
*Thursday, January 3, 2008 at 10:48pm by Quidditch*

**Physics**

A 245 g particle is released from rest at point A inside a smooth hemispherical bowl of radius 35.0 cm, as shown in Figure 5-21. (a) Calculate the gravitational potential energy at A relative to B. 1 . (b) Calculate the particle's kinetic energy at B. 2 (c) Calculate the ...
*Thursday, October 20, 2011 at 2:15pm by Brooks*

**physics **

A. A particle is traveling without friction up and down hills and valleys. If its initial potential energy is 6 J and its initial kinetic energy is 78 J, what is its total energy, E? E: J B. If at a later point its potential energy is -14 J, what is its kinetic energy K at ...
*Saturday, October 12, 2013 at 11:12pm by carol *

**physics!-concervation of energy equations**

wait...if this is conservation of energy, better to use: convert the potential energy into kinetic energy! (sorry). potential energy is mgh, and kinetic enery is (1/2)m*v^2
*Thursday, December 4, 2008 at 9:33pm by DanH*

**physics**

a) mass*gravity*height= gravitational potential energy. 17*103*9.8= x Joules b) as the object falls the potential energy is converted to kinetic. so just before it hits the ground all of the potential energy has become kinetic.
*Friday, May 11, 2012 at 7:53pm by Jay*

**Physics**

The initial potential energy of the watermelon is mass*acceleration*height or mgh for Earth. For practical purposes assume that total energy of the watermelon is constant. So the potential energy + the kinetic energy is constant. The kinetic energy is given at the point of ...
*Monday, January 28, 2008 at 5:53pm by Quidditch*

**PHYSICS helppppp**

A 0.2 kilogram baseball is thrown vertically downwards towards to the same horizontal floor. The baseball possesses an initial velocity of 30 meters per second. The height is 10.00m. (A) Calculate the POTENTIAL GRAVITATIONAL ENERGY and KINETIC ENERGY of the baseball at the ...
*Monday, February 19, 2007 at 6:21pm by Katrina*

**Science**

Wil kinetic energy increase or decrease based on the amount of potential energy it starts with?? If potential energy is lost, KEnergy increases. Potential Energy + kinetic energy= constant.
*Monday, February 5, 2007 at 7:52pm by Linda*

**Physics**

I need help with b... I found that k=.750880 for part a but I can't figure out what y would be to get potential energy. A 52 g mass is attached to a massless spring and allowed to oscillate around an equilibrium according to: y(t) = 0.8 * sin( 3.8 * t ) where y is measured in ...
*Saturday, December 4, 2010 at 9:48pm by Anonymous*

**physics**

If a mechanical system is conservative, the loss of potential energy goes into kinetic energy and any loss of kinetic energy shows up as potential energy. In other words, the sum of potential and kinetic energy is constant in a conservative mechanical system. If energy leaves ...
*Saturday, March 15, 2008 at 1:11pm by Damon*

**Physics**

please check: Which of the following energy forms is associated with an object in motion? a. potential energy b. elastic potential energy c. nonmechanical energy d. kinetic energy i think its B Which of the following energy forms is associated with an object due to its ...
*Monday, February 9, 2009 at 5:34pm by y912f*

**math**

kinetic energy is moving energy, or the energy possessed by an object in motion. potential energy is the the energy possessed by an object during rest. Similarity Think of a roller coaster. The chain pulls the rollercoaster full of people up the hill to the top. On the way up ...
*Monday, January 9, 2012 at 9:32pm by Jordan*

**physics**

The potential energy decreases as the kinetic energy increases. Ignoring air drag, the total mechanical (potential + kinetic) energy remains constant.
*Monday, January 9, 2012 at 7:58pm by Damon*

**Physics**

it says to use conservation of energy we know conservation of energy when not dealing with heat is u+k=u+k where u is the potential energy and k is you kinetic energy. potential energy is mass x gravity x height. kinetic energy is (1/2)(mass)(velocity)^2. from there you get ...
*Monday, November 15, 2010 at 11:57pm by jc*

**Physics**

After release, there is no more energy input, so the sum of potential and kinetic energies = constant =9.29 J At the equilibrium position, the potential energy is zero, so the kinetic energy is at its maximum and equal to ______ J.
*Thursday, December 9, 2010 at 1:10pm by MathMate*

**physics**

A 2.10-g particle is released from rest at point A on the inside of a smooth hemispherical bowl of radius R = 28.0 cm. Calculate the following: (a) Its gravitational potential energy at A relative to J (b) Its kinetic energy at B. J (c) Its speed at B. m/s (d) Its potential ...
*Tuesday, June 8, 2010 at 6:03pm by nicole*

**Genereal Physics I**

Ok, I figured it out. I find the potential energy, and subtract the potential energy from the total energy which was given in the problem. With that kinetic energy now I solve for V using kinetic energy equation. From there I'm able to find the Power with F*V. One of the ...
*Wednesday, October 13, 2010 at 5:27pm by VitaX*

**Physics**

what forms of energy are involved in the following situations? (choices: kinetic energy, potential energy - gravitational potential energy, elastic potential energy) a. a bicycle coasting along a level road b. heating water c. throwing a football d. winding the mainspring of a...
*Sunday, January 25, 2009 at 2:32pm by PB and apples*

**chemistry**

Two oppositely charged particles would accelerate as they approached one another, so their kinetic energy would increase. Since their kinetic energy would increase, and the total of kinetic energy and potential energy is constant, then the potential energy would have to ...
*Sunday, May 3, 2009 at 8:04pm by RickP*

**Physics**

a. kinetic energy b. heat and kinetic energy c. potential and kinetic energy d. potential and mechanical energy
*Sunday, January 25, 2009 at 2:32pm by Shakira*

**science**

It has kinetic energy when the CD is turning. Its potential energy depends upon its elevation. Asking "where" the energy is doesn't make a lot of sense. The kinetic energy is in any part that moves, and the potential energy is in all parts of the player.
*Monday, May 11, 2009 at 12:13am by drwls*

**Physics-energy**

work done = force * distance F = m a Change in potential energy = - m g (.52*10^3) sin 13.5 Change in kinetic energy = - (1/2) m (88-34)^2 (10^3 m/km/3600s/hr)^2 thermal energy + change in potential energy + change in kinetic energy = 0
*Tuesday, February 16, 2010 at 6:36pm by Damon*

**Physics**

I need help with part b, c, and d please! A 45 g mass is attached to a massless spring and allowed to oscillate around an equilibrium according to: y(t) = 1.4 * sin( 4 * t ) where y is measured in meters and t in seconds...
*Friday, December 3, 2010 at 1:55pm by Susan*

**physics**

at the top of the bump it stops rolling and stops going forward (teeters motionless) Thus at the top the kinetic energy is zero and the potential energy is m g (r+h) At the bottom the potential energy is m g r so it gained potential energy of m g h That is how much kinetic ...
*Sunday, March 3, 2013 at 4:56pm by Damon*

**PHYSICS**

They presumably want to to assume total mechanical energy (kinetic + potential) is constant, even though that is not the case. At the top of the 95 m hill, all of the energy is potential, and equals M g H = 744,800 J. Use the height or velocity at the other location, and the ...
*Wednesday, June 6, 2012 at 1:44am by drwls*

**Physics**

it's (A). As the cheerleader is thrown upwards, speed and kinetic energy is lost. As mechanical energy is the sum of both kinetic and potential energy, this is taken out of the question. The cheerleader will also be decelerating, so acceleration is not the case. Therefore, the...
*Wednesday, November 21, 2007 at 4:55pm by James*

**Physics (Potential & Kinetic energy)**

A 2.0 kg rock falls from a height of 25 m to a point 20 m above the ground. a) how much potential energy does it lose? b) How much kinetic energy does it gain? Thanks.
*Monday, January 11, 2010 at 7:32pm by Anna*

**Physics**

(a) (Force) x (stopping distance) = kinetic energy converted to heat = (1/2) M V^2 Solve for F (b) In this case, the initial kinetic energy is converted to both gravitational potential energy and heat. The horizontal force will be whatever you get in Part (a), multiplied by ...
*Wednesday, December 5, 2007 at 4:16pm by drwls*

**Integrated Physics and Chemistry**

The internal energy of a material is determined by.. A)its temperature B)the kinetic energy of its molecules C)the potential energy of its molecules D)the combined amount of kinetic and potential energy of its molecules
*Tuesday, April 19, 2011 at 10:05am by Ashley*

**Physics Help!!**

Suppose the kinetic energy of an object moving is 15 J and the potential energy is 25 J at some point in time. Then I measure the potential energy some time later and find it to be 10 J. What is the new kinetic energy?
*Friday, October 8, 2010 at 12:54pm by Liz*

**physics**

Subtract the kinetic energy at the bottom from the potential energy loss. The remainder becomes frictional heat. Potential energy loss: M g H = 21.7*9.81*3.5 = 745.1 J Kinetic energy at bottom of slide: = (1/2) M v^2 = 52.5 J
*Thursday, November 12, 2009 at 7:51pm by drwls*

**Physics Help Please**

You know that kinetic energy is 1/2*mass of box*velocity squared and that potential energy is mass of box*gravity*height. Conservation of energy says that kinetic energy initial plus the initial potential energy = final kinetic energy plus initial potential energy. you set ...
*Monday, November 28, 2011 at 12:22pm by Kayla*

**Physics**

Actually, I believe the answer is c - kinetic energy. Kinetic energy is energy that is in use, and as she rises, that is what is happening. It wouldn't be choice a because she is moving. (Potential energy is energy that has not yet been used.)
*Wednesday, November 21, 2007 at 4:55pm by Michael*

**Science**

A ball has a potential energy of 180 J and a kinetic energy of 0 J. After falling 2m, it has a potential energy of 135J. What is its kinetic energy at this point? PLEASE ANSWER THIS I'M STUCK!
*Thursday, January 19, 2012 at 9:07pm by Micheal*

**college physics**

Explain each of the following questions. ( a) Can an object– Earth system have kinetic energy and not gravitational potential energy? ( b) Can it have gravitational potential energy and not kinetic energy? ( c) Can it have both types of energy at the same moment? ( d) Can it ...
*Tuesday, October 5, 2010 at 11:33am by matt *

**Physics**

height = x sin theta potential energy = m g h = m g x sin theta assuming x is zero at the bottom and positive up ramp potential energy + kinetic energy = total energy = constant if ignoring friction potential = m g x sin theta kinetic = (1/2) m v^2 sum is constant so as x ...
*Thursday, March 13, 2014 at 6:19pm by Damon*

**physics**

Explain each of the following questions. ( a) Can an object– Earth system have kinetic energy and not gravitational potential energy? ( b) Can it have gravitational potential energy and not kinetic energy? ( c) Can it have both types of energy at the same moment? ( d) Can it ...
*Tuesday, October 5, 2010 at 11:14am by matt *

**Physics**

At the half-velocity point, the kinetic energy is 1/4 of the maximum value (because it is propotional to V^2). The other 3/4 of the initial energy must be potential energy. Therefore it has risen to 3/4 of its maximum height (12 meters). At maximum height, all energy is ...
*Friday, December 19, 2008 at 2:40pm by drwls*

**Science**

A ball has a potential energy of 180 J and a kinetic energy of 0 J. After falling 2m, it has a potential energy of 135J. What is its kinetic energy at this point?
*Thursday, January 19, 2012 at 3:37pm by Micheal*

**Physics**

The ground state energy of hydrogen is a sum of kinetic and potential energies. The potential energy is DEFINED to be zero when the electron and proton are infinitely far apart. As the electron gets closer, the attractive force between electron and proton makes the potential ...
*Tuesday, April 14, 2009 at 4:54am by drwls*

**Physics**

Kinetic energy at start = (1/2) m v^2 = (1/2)(3.5)(7.9)^2 = 109 Joules At the maximum displacement, it stops, so that kinetic energy has all gone into stretching the spring which stores it as potential energy Potential energy in spring = (1/2) k x^2 so (1/2) ( 725) * x^2 = 109...
*Tuesday, February 26, 2008 at 7:17pm by Damon*

**Physics**

The block moves up the ramp until the initial kinetic energy equals the potential energy increase PLUS the work done against friction. The initial kinetic energy equals the potential energy of the compressed spring, so (1/2)k*x_c^2 = M g L sin theta + M g (cos theta)*mu*L ...
*Sunday, March 13, 2011 at 11:14pm by drwls*

**help with physics please!**

I don't know what you mean by Us = 2.0 J This looks like a mass on a spring problem for which conservation of energy should be used. The sum of potential and kinetic energy equals a constant. At the equilibrium position, the kinetic energy is (1/2)M V^2 = (1/2)(2.5)(0.55)^ = 2...
*Thursday, June 18, 2009 at 8:53am by drwls*

**Physics**

We need to know its mass. Rearth = 6.380*10^6 meters Rorbit = 12.380*10^6 meters gain in potential energy + kinetic energy Potential: +G M m/rearth - G M m/rorbit = gain in potential energy Kinetic G M m/rorbit^2 = m V^2/rorbit V^2 = G M/rorbit Ke = (1/2) m V^2 add potential ...
*Sunday, February 16, 2014 at 4:46am by Damon*

**physics**

How much kinetic energy is gained by an electron that is allowed to move freely through a potential difference of 2.5 × 10^4 V? -- U=qV =(1.6*10^-19)(2.5*10^4) =4*10^-15 I'm not sure what other formulas i can use, or how to relate potential energy to kinetic energy because ...
*Friday, February 26, 2010 at 1:48pm by Anonymous*

**physics**

A 2.48-kg rock is released from rest at a height of 28.1 m. Ignore air resistance and determine (a) the kinetic energy at 28.1 m, (b) the gravitational potential energy at 28.1 m, (c) the total mechanical energy at 28.1 m, (d) the kinetic energy at 0 m, (e) the gravitational ...
*Monday, February 28, 2011 at 12:41pm by heather*

**physics**

A 2.48-kg rock is released from rest at a height of 28.1 m. Ignore air resistance and determine (a) the kinetic energy at 28.1 m, (b) the gravitational potential energy at 28.1 m, (c) the total mechanical energy at 28.1 m, (d) the kinetic energy at 0 m, (e) the gravitational ...
*Monday, February 28, 2011 at 12:41pm by heather*

**physics**

A 3.56-kg rock is released from rest at a height of 15.2 m. Ignore air resistance and determine (a) the kinetic energy at 15.2 m, (b) the gravitational potential energy at 15.2 m, (c) the total mechanical energy at 15.2 m, (d) the kinetic energy at 0 m, (e) the gravitational ...
*Sunday, March 31, 2013 at 8:10pm by Anonymous*

**Physics**

Total energy during the fall is constant. Thus loos of potential energy = gain in kinetic energy m g h = (1/2) m v^2 so v = sqrt (2 gh) Force * distance = energy Here the energy is m g h, the loss of potential energy during the fall.
*Saturday, March 9, 2013 at 3:23am by Damon*

**physics - energy**

1) What are the 3 basic forms of energy? Since there are so many, I'm thinking of kinetic and potential, but what would be the third? 2)The increase in potential energy of any system is equal to the output ___.
*Saturday, March 5, 2011 at 6:59pm by kriti*

**physics**

please check my answers what are the SI units for momentum? kg*m/s which of the following is not involved in hitting a tennis ball? a. kinetic energy b. chemical potential energy c. gravitational potential energy d. elastic potential energy i picked B How much power is ...
*Monday, February 16, 2009 at 8:35pm by y912f*

**physics**

Kinetic energy = (1/2) m v^2 Change of potential energy = kinetic energy. Do the other problem the same way.
*Thursday, February 11, 2010 at 2:52am by Damon*

**physics**

(a) Surely your text material incudes the formula for gravitational potential energy. Use it. (b) The kinetic energy increase at the bottom equals the potential energy calculated in part (a)
*Friday, May 11, 2012 at 7:53pm by drwls*

**Physics**

How much kinetic energy does a 1 kg ball have if it has a velocity of 10 m/s? a. 100 J. b. 50 J. c. 10 J. d. 5 J. A ping pong ball and a golf ball move with the same kinetic energy. Which is moving fastest? (golf balls are heavier than ping pong balls). a. The ping pong ball ...
*Wednesday, October 19, 2011 at 6:59pm by Trinh*

**Physics**

The initial kinetic energy must be enough to increase the potential energy enough to let it reach the 12 O'clock position. The initial kinetic energy is: KE = (1/2) I w^2 = (1/2)(1/3)M L^2*(Vti/L)^2 = (1/6)M Vti^2 (I is the moment of inertia and w is angular velocity) The ...
*Friday, December 4, 2009 at 2:55am by drwls*

**Physics**

It is the friction force times the distance travelled. This is the work done against the friction force, which is work transferred to heat. If you look at the sum of kinetic and potential energy, then this quantity is not conserved, because of friction. Without friction, the ...
*Saturday, September 25, 2010 at 1:06pm by Count Iblis*

**Physics**

When there is no compression OR tension on the spring, usually we call the potential energy zero. If you either compress it or stretch it, the potential energy increases. U = (1/2)k x^2 that is + for -x and for +x The kinetic energy is only when the mass is moving Ke = (1/2)m v^2
*Thursday, June 23, 2011 at 6:28pm by Damon*

**physics**

Assuming that potential energy is defined so that the value at ground level is zero, the total kinetic energy starts at M*g*H and remains that value until it hits the ground. Potential eneergy is changed to kinetic as it falls. M = 8 kg g = 9.8 m/s^2 H = 100 m Total energy = ...
*Sunday, January 22, 2012 at 1:20am by drwls*

**physical science**

A boy with a mass of 30 kg stands motionless at the end of a diving board 3 m above the floor. The boy has: Answer no energy. kinetic energy only. potential energy only. both kinetic and potential energy.
*Saturday, September 10, 2011 at 12:05am by Allison*

**Physics**

Consider the gravitational potential, kinetic, and total mechanical energies of a cart moving down an inclined ramp. (Also, let gravitational potential energy be defined to be zero when the cart is at the bottom of the ramp. A. Write an expression for the gravitational ...
*Thursday, March 13, 2014 at 6:19pm by Tim*

**science**

1.what similarities do nuclear energy and chemical energy share?pick all that apply A.both are types of kinetic energy. B.both are types of potential energy C.both involve magnetic energy D.both involve stored energy (I PICK B AND D) 3.the energy an object has due to its ...
*Wednesday, January 22, 2014 at 8:46pm by Matt*

**PhYsIcS**

The initial stored potential energy in the spring, (1/2) k X^2, is initial converted to 3/4 (cos 30)^2 kinetic energy of horizontal motion and 1/4 (sin 30)^2 kinetic energy of vertical motion. That means (1/8) k X^2 is available to be converted to potential energy. That tells ...
*Sunday, November 2, 2008 at 10:29pm by drwls*

**Physics**

Your guess is correct. Where potential energy is a maximum (at maximum height) the kinetic energy (and speed) must be a minimum. Where potential energy is a minium (a ground level) the kinetic energy (and speed) must be a maximum. If the ball went over a cliff, the speed would...
*Sunday, January 4, 2009 at 8:54pm by drwls*

**science(answer please)**

please answer these 1.what similarities do nuclear energy and chemical energy share?pick all that apply A.both are types of kinetic energy. B.both are types of potential energy C.both involve magnetic energy D.both involve stored energy 3.the energy an object has due to its ...
*Wednesday, January 22, 2014 at 8:27pm by Matt*

**physics to be conceptualize**

Which of the following statements are FALSE? Select all that apply. In an isolated system where only conservative forces cause energy changes, the kinetic energy and potential energy of the system can change, but the mechanical energy of the system cannot change. When the ...
*Tuesday, October 23, 2012 at 12:37am by member of physics*

**Physics**

You don't need to know the period. The sum of the kinetic (1/2) M V^2 and potential energy (1/2) kX^2 is constant. When X is half the maximum value, the P.E. is 1/4 of the maximum value. That means the kinetic energy is 3/4 of its maximum value, since energy shifts from all-...
*Wednesday, January 30, 2008 at 5:38pm by drwls*

**physics**

Use the potential energy and momentum. mommentum = mass times velocity So 2kg x 60m/s Take that answer and set it equal to the formula for potential energy. This works because when the rocks velocity is zero all the energy will be converted from kinetic energy to potential ...
*Saturday, March 23, 2013 at 10:02pm by Jared*

**Physics**

The electric potential energy of an object at point A is known to be 60 J. If it is released from rest at A, it gains 20 J of kinetic energy as it moves to point B. What is its potential energy at B?
*Saturday, May 5, 2012 at 10:56am by Hunter*

**physics**

Equate potential and kinetic energies: The pendulum at 30° is raised by a height of h=1.0 m *(1-cos(30°)) = (1-√(3)/2) m Let the velocity, v at the lowest be v, where the gravitational potential energy will be transformed to kinetic (motion) energy: mgh = (1/2)mv...
*Monday, November 22, 2010 at 2:03pm by MathMate*

**Physics**

You need to consider gravitational potential energy, spring potential energy, and block kinetic energy. The sum of the three is constant. I will refer gravitational P.E. to the equilibrium position (-0.2 m) M*g + (1/2)k(0.2)^2 + (M/2)(2.16 m/s)^2 = (-0.27 m)M*g + (1/2)k(0.27)^...
*Saturday, July 7, 2012 at 5:11pm by drwls*

**john tyler**

Base on the law of conservation of energy, energy cannot be created nor destroyed. Knowing this, potential energy=kinetic energy. Find the potential energy. PE=mgh m=mass, g=gravity, h=height
*Thursday, December 9, 2010 at 8:16pm by TutorCat*

**physics**

An electron will have more potential energy at the negative terminal. As it goes to the positive terminal that potential energy will be released to do work, increase kinetic energy or produce heat.
*Friday, February 13, 2009 at 11:26pm by drwls*

**Physics**

(a) (Stored slingshot potential energy) = (Kinetic energy of stone when released) (1/2)kX^2 = (1/2)MVo^2 Vo = X*sqrt(k/M) = 0.05*sqrt(400/0.1) = 3.16 m/s (which is not very fast) (b) (Maximum gravitational potential energy) = (Stored slingshot potential energy) M g H = (1/2) k...
*Thursday, December 27, 2012 at 8:19pm by drwls*

**7th grade**

Energy is the ability to do work. The two main types are kinetic energy (the energy of motion) and potential energy (stored energy). Anything moving (relative to you) has energy because it has kinetic energy. But things that are not moving (relative to you) can also have ...
*Wednesday, April 15, 2009 at 7:05pm by RickP*

**Physics**

The acquired kinetic energy equals the potential energy drop, which equals the charge times the voltage decrease. That will be in Joules. Then use Kinetic Energy = (1/2) M V^2 to solve for V
*Tuesday, February 16, 2010 at 12:41am by drwls*

**Physics**

If you mean how much kinetic and potential energy, you only lose potential energy, and that loss equals M g sin 30, which is what you came up with.
*Wednesday, March 11, 2009 at 8:52pm by drwls*

**ap physics**

When the man stopped at the bottom he had minimal potential energy and no kinetic energy. He had gone down 9.5 meters so the total energy he lost was m g h = 650*9.8*9.5 The net is also not moving then so all that potential the man had went into potential energy of the net. ...
*Sunday, March 25, 2012 at 2:26pm by Damon*

**Physics HELP!!!**

Kinetic energy = (1/2) I w^2 velocity of surface of ball = w r = .2 w = 3 so w = 3/.2 = 15 radians/second now potential energy at top = kinetic energy at bottom so m g h = (1/2) (2/3) m r^2 (15)^2 m cancels, g = 9.8 h = (1/3) (.04)(225/9.8)
*Wednesday, October 27, 2010 at 8:51pm by Damon*

**physics**

when you dive from atop a tall flagpole into a swimming pool below. His potential energy at the top is 14000 J (relative to the surface of the pool).What is his kinetic energy when his potential energy reduces to 1000 J?
*Saturday, March 3, 2012 at 6:22pm by Mrs G*

**physics**

Friction converts kinetic energy to a. mechanical energy b. potential energy c. nonmechanical energy d. total energy i don't think its B,..
*Saturday, February 21, 2009 at 3:16pm by Bella*

**Conservation of energy**

Can someone explain to me what happens when you take a slap shot in hockey according to conservation of energy? I think that when you wind up you have potential energy, then when you swing the stick towards the puck you have kinetic energy, then when the stick flexes you have ...
*Monday, June 13, 2011 at 8:11pm by Kyle*

**Physics**

A single conservative force F(x) acts on a 1.6 kg particle that moves along an x axis. The potential energy U(x) associated with F(x) is given by U(x) = -2.9xe-x/3 where x is in meters. At x = 3.4 m the particle has a kinetic energy of 7.2 J. (a) What is the mechanical energy ...
*Monday, March 7, 2011 at 11:30pm by Aaron*

**Physics**

When a skydiver jumps from a plane and achieves terminal speed. Which quantity remains constant? (a) Momentum (b) kinetic energy (c) potential energy (d) both a and b (e) both a and c I say kinetic energy, am i right?
*Saturday, April 4, 2009 at 2:39pm by James*

**Physics**

in a compressed spring, energy is in the form of (a) kinetic energy (b) potential energy (c) chemical energy (d) sound energy
*Wednesday, August 18, 2010 at 6:48am by Anonymous*

**Physics ~please help me!**

1.) A car (m=1200 kg) moves form 2.0 m/s to 15.0 m/s in 100 m. a) What is the initial kinetic energy of the car? b) What is the final kinetic energy of the car? c) what is the net work applied to the car? d) what force is applied to the car? 2.) A simple pendelum is 1.5 m long...
*Sunday, February 3, 2013 at 4:30pm by Isis*

**physics**

All of the potential energy lost is converted to heat, since the kinetic energy does not change. The potential energy loss is (Weight)x(Change in Height) = 1300 N * 14 m sin 30 = __?_ Joules
*Saturday, November 13, 2010 at 12:37am by drwls*

**Physics**

A ping pong ball and a golf ball move with the same kinetic energy. Which is moving fastest? (golf balls are heavier than ping pong balls). a. The ping pong ball is moving faster than the golf ball. b. The ping pong ball is moving slower than the golf ball. c. The ping pong ...
*Wednesday, October 19, 2011 at 6:59pm by Trinh*

**physics**

No matter what the angle is, the ball will gain kinetic energy M g H, the potential energy decrease. The kinetic energy per mass is V^2/2. Therefore V^2 will increase by 2gH, from 169 m^2/s^2 to 169 + 2*9.8*5.1 = 269 m^2/s^2. The new velocity = 16.4 m/s
*Friday, September 11, 2009 at 10:03pm by drwls*

**physics**

I can't visualize what is going on from your description but, when the spring is unstretched, the potential energy initially stored in the spring will be converted to kinetic energy of both masses and an increase in potential energy of the mass that slides back up the incline.
*Wednesday, April 7, 2010 at 5:24am by drwls*

**Physics kinetic energy**

Okay the equation for kinetic energy is = 1/2mv^2 so how would i figure this out?? If a semi-truck decreases its speed from 10 m/s to 5 m/s, its new Kinetic Energy is: a)4 times its old Kinetic Energy b)2 times its old Kinetic Energy c)1/2 its old Kinetic Energy d)1/4 its old ...
*Saturday, October 30, 2010 at 2:17am by Aisumi*

**physics**

The International Space Station, or any satellite, has both potential energy and kinetic energy. Without getting into the derivation of the relationships, sufficeth to say that the the ability of a unit mass at a distance r to perform work, with respect to infinity, is Ep = - ...
*Wednesday, October 17, 2007 at 10:16am by tchrwill*

**physics**

Use energy: gravitational potential energy: GPE = mgh kinetic energy: KE = (1/2)m*v^2 By conservation of energy, GPEi+KEi = GPEf + KEf. (Final energy = initial energy). At the bottom of the hill, GPEf = 0 (h=0). At the top of the hill, KEi = 0(v=0). Find the final kinetic ...
*Sunday, January 2, 2011 at 5:47pm by Marth*

**physics**

A quick way to do this is to use conservation of energy. The potential energy of the moving charge in the E-field of the fixed charge is: P.E. = k Q q/R where k = 8.99*10^9 N m^2/C^2 The kinetic energy of the particle is (1/2) m V^2 The initial energy, which is all potential, ...
*Monday, January 28, 2008 at 10:23pm by drwls*

**Physics**

Work is definitely not zero for launching a satellite. The kinetic energy must increase to reach orbital velocity. The potential energy also increases because you are raising it farther above the Earth's surface. The formula Epi = -G*m1*m2/R can be used for the potential ...
*Thursday, February 28, 2013 at 10:17pm by drwls*

**physics**

When a ball falls down from a height h, its P.E is transformed into K.E as it's free-falling, BUT..... wot abt objects not falling freely? So... What happens to the potential energy of an aeroplane when it lands, does it change to K.E (well it already has tht, doesn't it?) + ...
*Wednesday, June 29, 2005 at 3:07pm by Mike*

**physics**

Let R be the initial separation and r be thr radius of each. The initial potential energy is PE1 = -GM^2/R When the separation is R/2, the potential energy is PE2 = -2GM^2/R The reduction in potential energy, GM/R^2, is converted to kinetic energy equal to 2 *(1/2) M V^2, ...
*Sunday, March 16, 2008 at 9:56pm by drwls*

**Physics**

Starting potential energy less the work done on the way down equals the final kinetic energy. From the final kinetic energy, you can compute the final velocity.
*Monday, March 29, 2010 at 7:43pm by bobpursley*

**physics**

It will be at a value of the separation distance R such that the initial kinetic energy, 2*(1/2)M V^2, is equal to the potential energy k e^2/R. Note that you have to add the kinetic energies of the two particles, but the potential energy only has to be counted for bringing ...
*Sunday, March 15, 2009 at 11:28pm by drwls*

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