Monday

April 21, 2014

April 21, 2014

Number of results: 117,453

**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**

A 5.36 kg object falls freely (ignore air resistance), after being dropped from rest. Determine the initial kinetic energy, the final kinetic energy, and the change in kinetic energy for the following. (a) first meter of fall initial kinetic energy 0 J final kinetic energy ___...
*Saturday, March 8, 2014 at 3:16pm by George*

**Physics**

Two objects are mocing about so that their total momentum is zero. What can be said about their kinetic energy? Choose the most descriptive answer. a. the kinetic energy must be greater than zero b. the kinetic energy must be negative c. the kinetic energy must be equal to or ...
*Monday, March 21, 2011 at 5:05pm by Paige*

**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*

**physics**

Her initial kinetic energy must be greater than her kinetic energy at the top, by an amount equal to m g H, where H = 1.95 m. The m's cancel out when you write the kinetic energy terms.
*Wednesday, March 3, 2010 at 3:15pm by drwls*

**physics**

I don't understand why 16.7 J of kinetic energy has to be added to the initial kinetic energy of the mass instead of the final kinetic energy of the two split masses. Anyone have a good explanation ?
*Sunday, October 18, 2009 at 4:09pm by ghostanime2001*

**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*

**Physics**

(Braking Force) x distance = Initial Kinetic Energy Force times distance is work done against friction, which must equal the initial kinetic energy. Change 100 km/h to m/s before calculating Kinetic Energy For the Kinetic Energy formula, read my answer to your previous question.
*Saturday, July 17, 2010 at 12:47pm by drwls*

**PHYSICS**

A hollow tube (I = MR2) rolls without slipping along the surface. The ratio of its translational kinetic energy to its rotational kinetic energy is a. 1 b. 2 c. 3 d. 1/2 e. 1/3 I say A becasue both add up to get the total kinetic energy.
*Wednesday, April 22, 2009 at 1:15pm by Sandy*

**COLLEGE PHYSICS**

You seem to have omitted some words of the question, along with the coefficient of kinetic friction. Subtract the work done crossing the rough patch from the initial kinetic energy, and then add the additional kinetic energy gained when going down the frictionless hill. From ...
*Wednesday, June 9, 2010 at 11:31pm by drwls*

**Physical Science**

Can someone please check these answers for me? Write T for True or F for False for each statement: 1.Kinetic energy is the energy of motion - T 2.Kinetic energy doesn't depend on an object's direction. - T 3.When an object stops moving, its kinetic energy is zero. - T 4.As the...
*Monday, April 20, 2009 at 7:03pm by mysterychicken*

**physics**

Initial kinetic energy = (1/2)mv² Final kinetic energy = 0 Work done to dissipate this kinetic energy = F.d where d = 0.59 m 0.59F = (1/2)41 kg *(69/3.6)² Solve for F. (hint: > 10000 N.)
*Monday, September 28, 2009 at 3:18pm by MathMate*

**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 help**

1. Twice the speed requires 4 times the kinetic energy. What does that tell you about the height or the top of the track? 2. Forget about the bumps. The car that starts out with kinetic energy (from the push) has more kinetic energy at the bottom.
*Friday, November 7, 2008 at 11:51pm by drwls*

**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**

compute the kinetic energy of an 1800 lb automobile traveling at 30 mi/hr. how many times as great is the kinetic energy if the velocity is doubled? compute the kinetic energy, in erg and in joules, of a 2 gram bullet travelling at 500 m/sec.
*Thursday, April 17, 2014 at 6:37pm by Anonymous*

**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**

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 bowling ball has a mass of 8kg. if it rolls down the alley, without slipping, at 7m/s, calculate a) the linear kinetic energy, b) the rotaional kinetic energy, c) the total kinetic engergy
*Wednesday, January 12, 2011 at 1:22am by vanessa*

**physics**

Use the fact that kinetic energy = (1/2)MV^2. For half the kinetic energy, the V^2 term must be reduced from 400 to 200, in this case. That means V = 14.14 m/s If you reduce speed by half, you have 1/4 the kinetic energy
*Monday, March 21, 2011 at 11:59pm by drwls*

**Physics**

The work done equals the increase in kinetic energy, if there is no friction. They should have told you to assume that. In the real world, there will be some friction. I assume you know how to calculate the kinetic energy. When at rest, the kinetic energy is zero.
*Sunday, February 27, 2011 at 6:20pm by drwls*

**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**

You also need to consider the kinetic energy, unless you are thinking of using a giant space elevator (in that case you get the kinetic energy free of charge from the Earth's rotational energy).
*Friday, March 20, 2009 at 1:09pm by Count Iblis*

**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**

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-energy conservation**

when you apply the brakes of a car its kinetic energy or energy of motion decreases. a)to what form of energy is the kinetic energy converted? b)where does the resulting energy end up? Do the brake drums on the wheels heat up? so does it convert into heat energy?and the ...
*Tuesday, May 8, 2007 at 4:32am by Emma*

**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**

Use conservation of energy and be sure to include the rotational kinetic energy, (1/2) I w^2 For a cylinder, the moment of inertia is I = (1/2) M R^2 w is the angular velocity, which equals V/R. M and R will cancel out. Total kinetic energy = (1/2) M V^2 + (1/2) I w^2 = (1/2)M...
*Thursday, June 2, 2011 at 9:40pm by drwls*

**physics repost**

I tried to get the answer using the kinetic energy formula, and it works (for the answer of 1.1x10^7), but the only problem is, the homework is for the pages before the kinetic energy, so I would like to know how to figure out the answer without the kinetic energy formula. ...
*Sunday, October 14, 2007 at 6:03pm by Alexis*

**physics**

Set the bullet's kinetic energy (1/2) MV^2 equal to the amount of heat energy required to do that amount of heating and melting. You do not need to know the mass M; it will cancel out later. Both the kinetic energy and the energy needed to melt 53% of the lead are proportional...
*Friday, February 19, 2010 at 11:13pm by drwls*

**Physics**

A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity of non-kinetic ...
*Wednesday, December 15, 2010 at 12:43pm by Jon*

**Physics**

A 1000kg space craft at 500m/s is on a collision course with a 400kg satellite travelling at 700m/s. Their paths are converging at a 45 degree angle. After the collision, they remain locked together. a) calculate their final speed b) calculate the quantity of non-kinetic ...
*Wednesday, December 15, 2010 at 1:41pm by Jon*

**Science PHYSICS**

Ok thanks, so the transfer of energy is work done by the body? to clarify ... As the diver walks up the steps chemical energy is transferd through work and converts into GPE and kinetic energy. what is the energy transfer to begin the dive? chemical? once the dive has begun ...
*Tuesday, April 27, 2010 at 10:35am by Alice*

**physics**

If there is just one force acting on an object, does its work necessarily result in an increase in kinetic energy? Explain. (Select all that apply.) 1.Yes, when a force does work on an object it always results in an increase in kinetic energy. 2.The work done by the force on ...
*Thursday, February 4, 2010 at 10:04pm by rad*

**physics**

If there is just one force acting on an object, does its work necessarily result in an increase in kinetic energy? Explain. (Select all that apply.) 1.Yes, when a force does work on an object it always results in an increase in kinetic energy. 2.The work done by the force on ...
*Thursday, February 4, 2010 at 10:34pm by wassuh*

**physics**

jack measured that his racquet gives a squash ball 45.0J of kinetic energy when he hits it with a particilar shot.he also measures that it has 18.0J of kinetic energy after one bounce off the court wall. what percentage of its mechanical energy does the ball lose while it ...
*Tuesday, May 8, 2007 at 7:15am by Emma*

**physics**

A neutron in a reactor makes an elastic head-on collision with a nitrogen atom that is initially at rest. (The mass of the nitrogen nucleus is about 14 times that of the neutron.) (a) What fraction of the neutron's kinetic energy is transferred to the nitrogen nucleus? (b) If ...
*Sunday, October 28, 2012 at 8:27pm by heather*

**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**

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*

**Science PHYSICS**

I am trying to gain a understanding of the transfers and conversions of energy whilst the subject (being a diver) goes through its motions. Maybe i should be clearer .... SO as the diver makes his way to the top of the steps chemical energy is transferred from the body to the...
*Tuesday, April 27, 2010 at 10:35am by Alice*

**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**

Since it is rolling you must consider both the kinetic energy of both translation (forward motion) and rotation. The rotational kinetic energy is (1/2) I w^2 where I = (2/5) M R^2 for a solid sphere, and w = V/R is the angular velocity. Put it all together and you find that ...
*Thursday, April 29, 2010 at 2:52pm by drwls*

**physics help 3 please!!**

A 2.0 kg cylinder (radius = 0.08 m, length = 0.50 m) is released from rest at the top of a ramp and allowed to roll without slipping. The ramp is 0.77 m high and 5.0 m long. (a) When the cylinder reaches the bottom of the ramp, what is its total kinetic energy? (b) What is its...
*Saturday, October 18, 2008 at 2:24am by kelsey*

**Physics**

A pitcher claims he can throw a 0.157 kg baseball with as much momentum as a 1.5 g bullet moving with a speed of 1.50 multiplied by 103 m/s. (a) What must the baseball's speed be if the pitcher's claim is valid? m/s (b) Which has greater kinetic energy, the ball or the bullet...
*Saturday, November 6, 2010 at 2:24pm by matt*

**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 HELP**

A 10.0 kg cylinder rolls without slipping on a rough surface. At an instant when its center of gravity has a speed of 16.0 m/s, determine (a) the translational kinetic energy of its center of gravity.(b) the rotational kinetic energy about its center of gravity, and (c) its ...
*Tuesday, November 6, 2012 at 3:44pm by Sarah*

**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 do not understand your work. HE started with Kinetic energy and potentail energy. He ended with some kinetic energy. change= intial energy-final energy = 1/2 m Vi^2 + mg*h -1/2 m vf^2 where Vi=112000/3600 m/s Vf= 5.21m/s m=79.7kg I have no idea what conversions you might ...
*Saturday, June 18, 2011 at 4:39pm by bobpursley*

**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*

**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*

**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 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**

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**

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**

Since it is an elastic collision, total kinetic energy is conserved. They give you enough information to compute the initial kinetic energy of both balls and the final kinetic energy of the 10 kg ball. You don't need all the data about directions to solve for the 15 kg ball's ...
*Sunday, November 2, 2008 at 10:32pm by drwls*

**Physics-Kinetic energy**

Two 2.0 g bullets are fired with speeds of 40.0 m/s and 80.0 m/s, respectively. What are their kinetic energies? Which bullet has more kinetic energy? What is the ratio of their kinetic energies? A car has kinetic enery of 4.32* 10^5 when traveling at a speed of 23m/s. What is...
*Saturday, October 30, 2010 at 10:14pm by Pablo*

**physics**

A particle has a kinetic energy equal to its rest energy. (a) What is the speed of this particle? (b) If the kinetic energy of this particle is doubled, does its speed increase by more than, less than, or exactly a factor of 2? (c) Explain (d) Calculate the speed of a particle...
*Saturday, April 28, 2012 at 2:57am by martini*

**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!**

There seems to be some information missing here. If the impact is NONconservative, one needs to know how much of the batter's work is converted to kinetic energy of the ball. One also needs to know what fraction of the ball's initial kinetic energy is retained after it bounces...
*Tuesday, December 11, 2007 at 8:49pm by drwls*

**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 kinetic energy**

a) if a particle's speed decreases by a factor of four, by what factor does its kinetic energy change? b) particle A has three times the mass and twice the kinetic energy of particle B. What is the speed ratio VA / VB?
*Friday, October 31, 2008 at 2:36am by joyce*

**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*

**physics**

The work will equal the final kinetic energy, no matter how long it takes. I assume you know the formula for kinetic energy.
*Thursday, May 26, 2011 at 1:26pm by drwls*

**Physics 2010**

The rolling ball has additional rotational kinetic energy. It makes the total kinetic energy 0.6 M V^2 instead of 0.5 M V^2.
*Friday, August 12, 2011 at 2:38pm by drwls*

**physics**

kinetic energy gained = Qelectron * 10 volts (1/2)(mass of electron) v^2 = that kinetic energy you just found
*Tuesday, February 18, 2014 at 3:34pm by Damon*

**Physics - important**

a) e E x b) Assume the work done (above) equals the increase in kinetic energy c) It will travel until E e x = intial kinetic energy
*Tuesday, April 21, 2009 at 7:46pm by drwls*

**Physics**

I forgot to add one more part. d) Determine the ratio of her final kinetic energy to her initial kinetic energy.
*Thursday, December 2, 2010 at 1:17pm by Tarren*

**physics**

A motorcycle, an automobile and a bus are all traveling at the same speed. Which has the least kinetic energy? The greatest kinetic energy?
*Sunday, November 27, 2011 at 11:32pm by Anonymous*

**physics**

suppose an automobile has a kinetic energy of 2900J. when it moves with 3 times the speed, what will be its kinetic energy? answer in the units of joules
*Sunday, October 28, 2012 at 8:33pm by Emily*

**physics**

Use the formula for kinetic energy. (1/2) M V^2 with V = 12.0 m/s. The kinetic energy and velocity will decrease as the rock rises.
*Thursday, December 6, 2012 at 1:43am 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 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**

Assuming the car has no kinetic energy at the top... energy at the bottom = energy at the top energy at the bottom = kinetic energy kinetic energy = (1/2) * m * (v^2) So, (1/2)*m*(v^2)=20,000J Solve for v
*Tuesday, October 9, 2007 at 11:51pm by Quidditch*

**Physics**

A physics textbook is launched up a rough incline with a kinetic energy of 200 joules. When the book comes momentarily to rest near the top of the incline, it has only gained 180 joules of gravitational potential energy. About how much kinetic energy will it have when it ...
*Thursday, May 10, 2012 at 7:22pm by Bob *

**Physics**

Did you add the translational kinetic energy (1/2) M V^2 and the rotational kinetic energy (1/2) I w^2? I = (1/2)MR^2 and w = V/R, so Total KE = (3/4) M V^2
*Thursday, October 21, 2010 at 9:08pm by drwls*

**Physics**

hint Kinetic energy at bottom = kinetic energy at top + m g h where h = 8.81 sin 27.3
*Wednesday, December 12, 2012 at 6:03pm by Damon*

**physics**

(a) The same as his initial kinetic energy (b) The friction force F is (Initial kinetic energy)/(sliding distance) F = (1/2) M V^2/X Divide that by the player's weight (M g) to get the kinetic friction coefficient. mu,k = F/(M*g) = V^2/(2 g X)
*Thursday, April 10, 2008 at 4:20pm by drwls*

**Physics**

Determine the ratio of the relativistic kinetic energy to the nonrelativistic kinetic energy (1/2mv2) when a particle has a speed of (a) 2.12 x 10-3c. and (b) 0.959c.
*Friday, July 20, 2012 at 4:54pm by Beth*

**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**

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*

**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*

**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*

**physics**

determine the kinetic energy of falling by an average of one degree of freedom of the nitrogen molecule at temperature T = 1000 K, as well as the kinetic energy of rotational motion.
*Monday, March 28, 2011 at 8:46pm by lisa*

**Physics**

If a 1000-kg car was moving at 30 m/s, what would be its kinetic energy expressed in the unusual (for kinetic energy) units of calories? (1 cal = 4.186 J)
*Sunday, December 19, 2010 at 12:57pm by JJ*

**physics**

becomes kinetic energy. (b) Use the definition and value of kinetic energy to compute V
*Friday, February 4, 2011 at 3:16am by drwls*

**physics**

I disagree that the kinetic energy of the car is equal to the kinetic energy of the lorry wheel :)
*Sunday, November 27, 2011 at 3:05am by Damon*

**Physics**

If friction has no effect, why would he roll and not just slide? I will assume in fact that there is no friction and he does not roll so translational kinetic energy is all the kinetic energy he has (no rotational) 58- change in potential energy = m g (25 -58) change in ...
*Sunday, December 15, 2013 at 3:21pm 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**

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 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**

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**

The rotational kinetic energy of one wheel is 1/2 * I * w^2 where I is the moment of inertia of the wheel, w is the angular speed of the wheel. The total kinetic energy of the system is the sum of the rotational kinetic energies of each wheel, plus the translational kinetic ...
*Tuesday, October 30, 2012 at 8:17pm by Jennifer*

**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*

**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**

In the reaction U gives Th + He 6.88*10-13 J energy are released as the kinetic energies of the products. If the ratios of the masses Th to He is 2.4:4 find the kinetic energy of the alpha particle
*Thursday, February 23, 2012 at 7:01pm by eva*

**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**

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*

**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**

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**

How do i find this? A shooting star is a meteor that burns up when it reaches Earth's atmosphere. Many of these meteoroids are quite small. Calculate the kinetic energy of a meteoroid of mass 6.0 g moving at a speed of 45 km/s and compare it to the kinetic energy of a 1400-kg ...
*Sunday, April 4, 2010 at 9:44pm by raina*

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