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April 23, 2014

Search: Physics-energy

Number of results: 117,197

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
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

science-physics
Q1)which of these energy resources does not originate from the suns energy?:natural gas,oil,geothermal energy,coal Q2)the burning of fossil fuels does not release? potential energy,light energy,sound energy , heat energy?? Q3)at the moment renewable energy sources generate? ...
Monday, November 5, 2007 at 4:44pm by elliot

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
energy in f riction= mg*mu*.05m = 5.886 leftover energy= 1/2 m 1.5^2 = 1.35 So, If I add the leftover energy and the energy in friction I get the initial energy. Then what??
Wednesday, March 31, 2010 at 2:07pm by Holy Grail

Science
Which 6 are energy from sunlight?? nuclear energy,geothermal energy,tidal energy,fusion energy,wind,hydroelectric energy,solar energy,biomass,fossil fuels,ocean thermal,energy conversion
Monday, November 14, 2011 at 5:18pm by Jason

Physics
Which of the following is not an example of potential energy? a.)The energy stored in a pile driver b.)The energy stored in a stretched spring c.)The energy of a body moving across a horizontal surface d.)The energy in the water at the top of a waterfall
Friday, July 29, 2011 at 11:36pm by Tarissa

SCIENCE PLZZ HELP
Which 6 are energy from sunlight?? nuclear energy,geothermal energy,tidal energy,fusion energy,wind,hydroelectric energy,solar energy,biomass,fossil fuels,ocean thermal,energy conversion
Monday, November 14, 2011 at 6:00pm by Jason

Physics(work and energy)
You have done it well, the principle is conservation of energy: the energy at the top of the wall (PE+KE) is equal the the original energy.
Sunday, May 20, 2012 at 12:50pm by bobpursley

Physics
energy stored in spring= 1/2 k d^2 energy in f riction= mg*mu*.05m leftover energy= 1/2 m 1.5^2 well, initial energy=finalenergy+frictionwork solve for d
Wednesday, March 31, 2010 at 2:07pm by bobpursley

Integrated Physics and Chemistry
If the kinetic energy of a sample increases, the ____ will also increase. A)potential energy B)temperature C)chemical energy D)nuclear energy
Thursday, April 21, 2011 at 10:16am by Ashley!!

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
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!-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
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

Physics
Subtract the particle energy at 0.905c from the (higher) energy at 0.980c. They have already told you the v's. When you divide by c in the Lorentz-factor, you will get v/c values of 0.980 and 0.905. The energy at speeed v is m c^2 / sqrt[1 - (v/c)^2] That includes the rest-...
Friday, April 3, 2009 at 10:57pm by drwls

PHYSICS
percent efficiency: (final energy)/initial energy * 100 so I see about 1059/1130 * 100=93.7 percent Now, on a: demonstrate the law of conservation of energy: Does initial energy= final energy? not exactly, some mechanical energy was lost, probably to friction.
Sunday, January 31, 2010 at 11:28am by bobpursley

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
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
I dont know if there are only five. I have friends in biophysics, astrophysics, astronomy, high energy physics, condensed matter physics, nuclear energy, and physics education. Most engineering is applied physics.
Wednesday, August 29, 2007 at 8:17pm by Bobpursley

Physics
this case the energy of sistem is conservation of energy: (1/2)kx² = (1/2)mv² then you can find the energy of springs, this energy would be the energy of total sistem because no exist friccion. the maximum velocity of the mass v= square root((kx²)/ m) the speed when it has ...
Saturday, June 2, 2012 at 12:07am by Delbarre

physics
not quite any energy lost to friction or air resistance would prevent it from having enough energy to make it back to the same height (unless it started with a big push) If not moving at start, total energy = potential energy = m g h if any energy is lost during the trip, it ...
Sunday, January 29, 2012 at 7:15pm by Damon

Physics
Mechanical energy is the sum of (gravitational) potential energy and kinetic energy. If there is no friction, the mechanical energy is constant.
Tuesday, December 14, 2010 at 10:38pm by drwls

Science
During the process of photosynthesis, solar energy is converted into: a. chemical energy. b. heat energy. c. thermal energy. d. mechanical energy. e. nuclear energy. a
Monday, February 26, 2007 at 8:11pm by Dave

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
A)When the energy input to gas fired power station is 1000MJ,the electrical energy output is 300MJ.What is the efficiency of the power station in changing the energy in gas into electrical energy b)what form does the 700MJ of lost energy take c)what is the fate of the lost energy
Wednesday, August 3, 2011 at 4:58am by Luc

Physics
Energy= boltzmanns constant*speedlight/wavelength Energy= inonization energy wavelength= incoming light solve for wavelength. Remember: MEMORIZE Planck's equation energy= boltzmannconstant*frequency
Thursday, April 22, 2010 at 10:20am by bobpursley

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
Potential energy and kinetic energy are forms of what kind of energy? 1. mechanical 2. nuclear 3. heat 4. electromagnetic 5. chemical
Wednesday, October 26, 2011 at 5:44pm by lynn

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
The potential energy transforms into other forms of energy such as thermal energy when the tires are rubbing against the ground.
Sunday, January 2, 2011 at 12:56am by Mihir Kansagra

physics
Which of the following statements is a consequence of equation E=mc^2? Energy is released when matter is destroyed Mass and energy are equivalent The law of conservation of energy must be modified to state that mass and energy are conserved in any process all of the above ...
Wednesday, April 11, 2012 at 9:12pm by kevin

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. 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
SpringcompressedEnergy + initialPE =KE final 1/2 k s^2+mgh=1/2 m v^2 This v is the velocity at the floor when it hits. h is the intial height of the ball (table). h is 1.20, not 1.35 as I indicated. v=sqrt(2gh+ks^2/m) The above is just sayingthe intial energy has to equal the ...
Friday, November 7, 2008 at 11:58pm by bobpursley

physics
electricl energy is turned into light energy in a light bulb. electrical energy is turned into sound energy by speakers a nuclear reactor turns nuclear energy into electrical energy. What you could do is set up a 10x10 grid of the types of energy and try to come up with a ...
Sunday, December 19, 2010 at 8:02am by Dr Russ

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

Physics pls anyone can help me? its urgent
Simple. What is the Potential energy of each charge? Well, PE is a scalar, so the distances are the same to each charge, so energy=k(q1Q2/r+Q1Q3/r+Q1Q4/r+Q2Q3/r+Q2Q4/r+Q3Q4/r)= 6k if all q are 1, all r is 1. Now consider putting the thing together. first charge, no energy ...
Friday, November 8, 2013 at 6:40pm by bobpursley

physics
The use of conservation of energy approach will tell you right away that V = sqrt(2 g H) loss of potential energy = M g H = gain in kinetic energy = (1/2) M V^2 Therefore 2gH = V^2
Monday, November 24, 2008 at 11:50am by drwls

physics
Use conservation of energy and subtract 319 from the initial potential energy of MgH = 413 J. The difference is the kinetic energy at the bottom of the slide. Get the speed from that.
Thursday, March 8, 2012 at 9:09pm by drwls

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
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 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
The Sun puts out 3.9 x 10^26 J of energy per second. Assuming 100% conversion to energy, how much mass is required to create this energy
Monday, April 21, 2008 at 6:55pm by Joy

physics
On a playground slide, a child has potential energy that decreases by 1000 J while her kinetic energy increases by only 900 J. How much energy is missing and where did it go?
Wednesday, October 10, 2012 at 8:05pm by Anonymous

Physics
(a) Subtract her final kinetic energy (MV^2/2) from her initial potential energy (M g H). That is the energy lost to friction. Divide that energy loss by the diatance she travels (65 m) to get the average friction force, f. (b) f = muk * cos 18 * M * g Solve for muk
Tuesday, May 25, 2010 at 1:48pm by drwls

Science
Molecules that make up matter move constantly.Which of these forms of energy refers to the energy of the moving molecules and why? A.Chemical Energy B.Thermal Energy C.Electrical Energy D.Light Energy Which device can change electrical energy to light and sound energy? A....
Monday, April 2, 2012 at 5:06pm by Rezu

Physics
Heat energy is the energy associated with changes in internal energy. If no phase changes occur, the transfer of heat energy is accompanied by a change in?
Wednesday, June 8, 2011 at 8:20pm by Billy

physics
It has been proposed to use large inductors as energy storage devices. How much electrical energy is converted to light and thermal energy by a light bulb with a power of 195 W in one day? If the amount of energy calculated in part (a) is stored in an inductor in which the ...
Wednesday, March 9, 2011 at 7:59pm by Sarah

Physics
Thanks for the help drwls. I have now also found the average kinectic energy of the helium atoms. But what is the position of the maximum in the energy distribution? Is this the peak energy that I need to find?
Monday, May 19, 2008 at 8:57am by Oli

physics
In the first instance you are minimizing your flow of energy from your energy source, for example your fuel tank. The meaning of conservation of energy in physics is that in a physical process the total amount of energy does not change. However it may become quite useless to ...
Thursday, August 26, 2010 at 4:18pm by Damon

physics
The physics of energy and Earth's moon as a satellite. The moon is an Earth satellite of mass 7.35 x 10^22 kg, whose average distance from the centre of Earth is 3.85 x 10^8 m. a) What is the gravitational potential energy of the moon with respect to Earth? b) What is the ...
Sunday, April 24, 2011 at 8:43pm by aly

physics-energy conservation
some people refer to heat as "low grade energy. a)how is low grade energy different from high grade energy? b)give two example of high grade energy When heating a cup of tea, which would be preferable...a stove with a burner on top, or a heating pad? High grade energy is ...
Tuesday, May 8, 2007 at 4:41am by Emma

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
Eupper - Elower = h*(frequency) = h*c/(wavelength) Each energy level has a certain atom energy associated with its electron orbits. A photon of light with a specific energy is emitted or absorbed when a transition occurs between levels. Total energy remins conserved. h = ...
Wednesday, February 9, 2011 at 6:08am by drwls

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
The energy in one second is what you are seeking. Energy/second= 5.0E-13W/m^2 * area Number photons= energy in a second/energy per photon. The energy per photon= planck's constant*frequency= planck'sconstant*c/wavelength
Monday, April 14, 2008 at 9:39pm by bobpursley

Physics
The kinetic energy when it reaches its final height must be 0. By conservation of energy, the energy it has at its final height is equal to the energy when it is launched.
Sunday, January 10, 2010 at 5:51pm by Marth

Physics
It did accelerate since the kinetic energy increased. 1000 J of work was done pusing the object. The remaining 500J of energy could have gone into potential energy or frictional heating, or some of each.
Tuesday, March 17, 2009 at 12:10am by drwls

Physics
Gravitational Potential energy -> Kinetic Energy -> Electrical Energy -> Chemical Energy
Tuesday, May 15, 2012 at 11:04pm by drwls

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 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

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
A 2 kg rock is released from rest at a height of 29 m. Ignore air resistance and determine the kinetic energy, gravitational potential energy, and total mechanical energy at each of the following heights;20m 15m 9m * physics - bobpursley, Wednesday, November 17, 2010 at 9:32am...
Wednesday, November 17, 2010 at 12:30pm by Jay

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 fan uses 150j of mechanical energy, 20j of heat and 75j of sound energy a) what is the total input energy b) what is the total useful output energy c)what is the total wasted energy d) what is the energy efficiency e) what percent of the energy was wasted
Sunday, December 5, 2010 at 3:57pm by Anonymous

Physics
Learn these formulas. kinetic energy = (1/2) M V^2 potential energy = M g H g is the acceleration of gravity, and H is the height above ground. M and V have obvious meanings Now, do the calculations. For energy in joules, mass M must be in kg.
Saturday, July 17, 2010 at 12:37pm by drwls

Physics
mgh=rotational energy + translational energy I assume the 20 is an angle mg(1.90 sin20)=1/2 I w^2+1/2 mv^2 but v=wr so = 1/2 I w^2+1/2 m w^2 r^2 so calculate w. then you have the two terms, and the total energy, solve for the fraction.
Sunday, April 10, 2011 at 5:36pm by bobpursley

physics
Energy is in joules. Power is in watts. Sometimes electrical energy is spoken of as watt-hours, or watt-seconds, or kw-hrs. But in the end, joules is energy. Multiply watts x time to get energy.
Monday, October 22, 2007 at 3:14am by bobpursley

Physics
If a 60 kg meteor falls to earth from a great distance. How much gravitational potential energy does it lose? (the energy PE is 0 at a great distance). What happens to this potential energy? Final-Initial=-Gmm/r-0=change in energy
Thursday, January 31, 2013 at 8:02pm by Brittany

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

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
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

Science
Which one of these is a form of stored energy? A. Heat energy B. Light energy C. Electrical energy D. Chemical Energy D?
Monday, April 2, 2012 at 4:26pm by Rezu

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
False. It will not accelerate because the extra kinetic energy has to come from somewhere. On a level surface, the gravitational potential energy does not change. However, it will not decelerate, because no energy is dissipated, apart from air resistance, which I assume is ...
Sunday, September 19, 2010 at 6:35pm by MathMate

physics
The easy way is to use conservation of energy. At the vertical position, the potential energy decrease, M g L/2, equals the kinetic energy increase, which is (1/2) I w^2 = (1/6)ML^2*w^2 gL/2 = L^2 w^2/6 w^2 = 3 g/L w = sqrt(3g/L) = 5.42 rad/s (since L = 1 meter)
Tuesday, October 25, 2011 at 12:44pm by drwls

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
Show how Bernoulli’s energy equation for a fluid can be derived by considering how the work done by the fluid moving from point 1 to point 2 is equal to the energy gained or lost by the fluid. You can assume the potential energy PE=mgh and the kinetic energy KE=0.5mv 2 , where...
Tuesday, May 8, 2012 at 11:53am by Aisling

Physics
Figure the energy of one photon with that wavelength. E=hf=hc/lambda then divide the given energy by the energy per photon.
Thursday, May 28, 2009 at 11:09am by bobpursley

physics
Initial kinetic energy = (1/2) M Vo^2 = (thermal energy generated) + (potential energy increase) = 414 J + M g H = 982 J Solve for Vo
Thursday, December 9, 2010 at 3:03pm by drwls

Physics
that is simple. energy is never lost so energy lost by microwave=energy gain by ice cube 32200=105t t=306.6667secs
Tuesday, March 16, 2010 at 12:09pm by Aanu

Physics - gravitational potential energy
Constant speed implies no net force, no net acceleration, no energy going to increase Kinetic energy.
Wednesday, October 6, 2010 at 6:16am by bobpursley

Physics Help Requested!
QUESTION What is the change in energy of the hydrogen atom as the electron makes the transition from the n=3 energy level to the n=1 energy level? ANSWER xxx eV
Saturday, April 26, 2008 at 11:29pm by Chelsea

physics
Compute the hammer's kinetic energy. 1/4 of that energy is converted to hammer and spike internal energy, or so they say. The rest (3/4) supposedly does work on the rail tie.
Monday, February 7, 2011 at 12:50am by drwls

physics
The difference between energy radiated from the sun and energy radiated from the Earth has to do with ____________________. A) Neither of these.B) Both of these.C) radiation frequencies.D) the amounts of radiant energy.
Saturday, March 24, 2012 at 9:44pm by Jim

physics
The difference between energy radiated from the sun and energy radiated from the Earth has to do with ____________________. A) Neither of these.B) Both of these.C) radiation frequencies.D) the amounts of radiant energy.
Sunday, March 25, 2012 at 2:02pm by Kristie

physics
The correct answer is 21.276 Consider the law of conservation of energy in solving this problem. i.e. gravitational potential energy = elastic potential energy. So, m g (h-3) = 1/2 k x^2.
Tuesday, July 23, 2013 at 12:52pm by Ozone

Physics
Because of conservation of energy, kinetic energy K is equal to the potential energy of the spring: K = U. So (mv^2)/2 = (kA^2)/2. Solving for k, we have k = (mv^2)/A^2, which is d).
Sunday, March 25, 2007 at 2:17pm by Pable

physics
Which of the following is correct for the energy levels in an atomic system? Choose one answer. a. The energy value increases with the distance from the nucleus. b. The energy value decreases with the distance from the nucleus. c. The energy value remains the same for all the ...
Sunday, May 1, 2011 at 3:30pm by ashley --- HELP PLEASEE!!!

physics
Temperature is distinguished from heat when we note that whereas temperature is ____________________. A) None of these.B) measured in degrees, heat is measured in units of energy.C) a measure of average translational kinetic energy per molecule, heat is energy that moves from...
Saturday, March 24, 2012 at 9:45pm by Kristie

physics
1. Temperature is distinguished from heat when we note that whereas temperature is ____________________. A) None of these.B) measured in degrees, heat is measured in units of energy.C) a measure of average translational kinetic energy per molecule, heat is energy that moves ...
Sunday, March 25, 2012 at 2:01pm by Kristie

Physics
If the net work done on an object is positive then the object's energy is ...? The object's energy would also increase since W= energy right? The object's energy wouldn't increase or decrease.
Wednesday, October 17, 2007 at 7:51pm by Andrea

PHYSICS
No, not for a solid sphere. You can find it from the experiment. Conservation of energy: final energy= energy at top of incline 1/2mv^2 + 1/2 I w^2= mgh= 1.6*9.8*2.3sin28 but w=v*r, so 1/2 mv^2+1/2 I v^2 r^2= 1.6*9.8*2.3sin28 Solve for I.
Wednesday, October 24, 2007 at 1:31pm by bobpursley

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

principles of physics
Temperature is distinguished from heat when we note that whereas temperature is ____________________. A) None of these.B) measured in degrees, heat is measured in units of energy.C) a measure of average translational kinetic energy per molecule, heat is energy that moves from ...
Saturday, March 24, 2012 at 8:08pm by Kristie

Physics
In problem 2: 1/2*L*I^2= Total Energy. And, 1/2*C*V^2 = Total energy. (Same of the first) Here you get V. And the energy in coulumb = C * V Thats the answer of the p2. e)
Wednesday, May 22, 2013 at 9:20pm by SyLaR

Physics
energy is .1ev energy= plancks constant*c/lambda change energy from ev to joules, then solve for lambda
Tuesday, January 28, 2014 at 7:50pm by bobpursley

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