Number of results: 1,146
physics
(a) PE = m•g•h (b) KE = PE (c) mv²/2 = PE, v =sqrt(2•PE/m)
Thursday, May 10, 2012 at 11:51am by Elena
physics
PE = mgh Therefore m = PE/(g x h) m = 24/(9.8 x 3) m = 0.82kg Now the object is moved to 1m above the ground. PE = mgh PE = 0.82 x 9.8 x 1 PE = 8.036 Round off to 8 (A) Alternatively, you could divide 24J by 3, as this is the change in height difference. But you may be marked ...
Thursday, October 22, 2009 at 12:54pm by James
physic
PE = mgh Therefore H = PE/(mxg) H = 7/(1.5 x 9.8) H = 0.48m PE (object 2) = 4.5 x 9.8 x 0.48 PE (object 2) = 21.17J
Thursday, October 22, 2009 at 12:51pm by James
PHYSICS
No. The PE relative to the surface below the ice will be PE=mgh=52.5*g*(-2.8m) notice the PE is negative, it takes energy to get the object back to the surface. PE is always relative to some arbitary reference point.
Sunday, January 31, 2010 at 10:48am by bobpursley
Physics
OK, i was told by my teacher that mg would equal together 2 kg. If your including g then: PE = mgh PE = (2)(9.8)(5) PE = 98 J
Monday, January 4, 2010 at 4:38pm by Priscilla
physics
PE = mgh PE = 2 x 3 x 9.8 PE = 58.8J
Thursday, October 22, 2009 at 12:47pm by James
physics
It doesn't matter where the zero of PE is when you are talking about differences in PE, as you are here. difference in PE = M g (H2 - H1) = 52* 9.81 * 17.7 = __ J
Wednesday, December 15, 2010 at 3:14am by drwls
physics
PE at surface= GMm/r PE mars= GMmars*m/rm PE earth= GMe*m/re so on mars, you have to overcome the PE at the surface, or 1/2 m v^2=GMmars*m/rmars velocity= sqrt(2G*MassMars/radiusMars)
Saturday, June 2, 2012 at 6:50pm by bobpursley
Economics
Hi My three criterion are now, if the share is blue-chip or not, the companies PE and its comparison to the S&P/ASX200. Regarding the companies I have compared it to a rival companies PE, I said that it is good that its PE is higher than the other company but it is still a...
Saturday, May 28, 2011 at 3:24pm by Em
Physics
It has a potential energy of PE = mgh due to its position PE = .2 x 9.8 x 10 If all of the PE is translated to KE, what is the KE?
Thursday, March 7, 2013 at 2:07pm by Dr. Jane
Physics (Help!)
KE+PE=a constant first find the constant. AT the beginning, PE is zero, and KE is K KE+PE=K when at half height, PE=1/2 K KE+1/2 K=K KE=1/2K
Sunday, January 9, 2011 at 5:26pm by bobpursley
Physics
1. PE = W(fr)+KE W(fr) =PE-KE= =mgh - mv²/2 = =2.5(9.8•350 - 60²•/2)= = 4075 J. PE =mgh = 2.5•9.8•350=8575 J. W(fr)/PE =4075/8575 =0.48. 2. PE =mgh = 35•9.8•12 =4116 J. k = PE/W =4116=5500 =0.75
Sunday, June 17, 2012 at 3:34am by Elena
physical science
Potential energy, as the boy is not in motion and is suspended above the ground. If you wanted to find the energy, the equation is; PE = mgh PE = 30 x 9.8 x 3 PE = 882J
Saturday, September 10, 2011 at 12:05am by James
physics
Since KE + PE = constant = PEmax , when KE = PE/3, (4/3)PE = PEmax PE = (3/4)PEmax The height must be 3/4 of 433 mm, or 325 mm
Saturday, December 3, 2011 at 11:11pm by drwls
science
(a) recall that potential energy is stored energy, and is given by the formula: PE = mgh (units in Joules) where m = mass (in kg) g = acceleration due to gravity = 9.8 m/s^2 h = height (in m) if the reference position is at the floor (that is, h = 0), the PE is equal to PE = 4...
Saturday, October 22, 2011 at 12:30am by Jai
Physics
A 2.0-kg rock falls from a height of 25 m to a point 20 m above the ground. How much potential energy does it lose? GIVEN: mg = 2.0 kg h/d = 5 m PE = mgh PE = (2)(5) PE = 10 J
Monday, January 4, 2010 at 4:38pm by Priscilla
Physics
Total energy (kinetic plus potential energy) at any point in the oscillator is a constant. KE = (1/2)m v^2 PE = (1/2)kx^2 TE = KE + PE KE1 + PE1 = KE2 + PE2 0.2435J + PE(3.60cm) = 0.1293J + PE(5.10cm) 0.1142J = PE(5.10cm) - PE(3.60cm) 0.1142J = (1/2) k(5.10cm)^2 - (1/2) k (3....
Tuesday, January 8, 2013 at 2:47pm by Amy
physics
PE=mgh h↓ => PE↓ at the ground PE=0
Thursday, February 7, 2013 at 2:13am by Elena
Physics
(a) PE= mgx=1.9•9.8•(1.13-3)= - … (b) PE =mgh=1.9•9.8•(3-1.13)= + … (c) ΔPE=0
Wednesday, November 21, 2012 at 12:49am by Elena
Physics 11th grade 2
1) PE = mgh PE = 20 kg * 9.8 m/sec^2 *100m KE = PE KE = 1/2 * m*v^2 2) W=F x d F = mg Force = 55 x 9.8 m/sec^2
Monday, March 11, 2013 at 5:13pm by Dr. Jane
College Physics
You know the energy in the spring: PE=massprojetile*g*heightitgoes so now in the spring. PE=1/2 k x^2 solve for k speed thru equilibrium? 1/2 mv^2=PE above solve for v
Sunday, September 30, 2012 at 8:44pm by bobpursley
physics
PE = m x g x h PE = 2.48 x 9.8 x 28.1 PE = 682.94J at 28.1m KE at 28.1m = 0, because the object is still at rest. The kinetic energy at 0m transfers from the previously stated gravitational potential energy. KE = 682.94J at 0m Therefore PE = 0J at 0m Mechanical energy is the ...
Monday, February 28, 2011 at 12:41pm by James
Physics - Re-post
A .20 kg ball is attached to a vertical spring. The spring constant is 28 N/m. The ball is supported initially so that the spring is neither stretched or compressed, is released from rest. How far does the ball fall before brought to a momentary stop by the spring? Our teacher...
Tuesday, January 18, 2011 at 3:57pm by Jennifer
Physics ~Conservation of Energy~ part 2
1) a) W=mgh b) PE=mgh c) E(toral) = PE = mgh d) KE= PE=mgh e) mv²/2=mgh v=sqrt(2gh) 2) pendelum ... car ???
Wednesday, January 30, 2013 at 6:12pm by Elena
Physics
work this as energy. Initial PE=Final PE+friction work Initial PE=mgh final PE=1/2 k x^2 where k=2250, x-.030 frictionwork= mg*cosTheta*mu*6 So, put this into the equation, solve for mu. However, the angle of the ramp needs to be known to solve it, I don't see it given, or...
Wednesday, April 25, 2012 at 6:32am by bobpursley
Physics-Help, confused!
A .20 kg ball is attached to a vertical spring. The spring constant is 28 N/m. The ball is supported initially so that the spring is neither stretched or compressed, is released from rest. How far does the ball fall before brought to a momentary stop by the spring? Our teacher...
Monday, January 10, 2011 at 8:36pm by Jennifer
physics
A) PE of gravity= m*g*h m=mass of object g=acceleration due to gravity h= distance mass= weight/gravity=4.383 PE=(4.383kg)(9.81 m/s^2)(1.7m) PE=73.095 J
Wednesday, February 8, 2012 at 9:13am by alexis
Physics
Potential energy of the charges is PE=k•q^2/r=9 •10^9•(9•10^-6)^2/0.052=14 Joules. According to the Law of conservation of energy PE=2KE KE=mv^2/2. 2KE= mv^2 =PE v=sqroot(PE/m)=sqroot(14/10^-3)=118.3 m/s.
Saturday, February 25, 2012 at 5:07pm by Elena
physics
Find the real height, rather than the slant height. Use Sin Cos or Tan. Plug that value into PE=mgh solve for PE. PE=KE KE=1/2mv^2 Solve for v
Wednesday, December 19, 2012 at 9:22pm by PhysicsPro
Economics URGENT
Hi My historical EPS is the 2004/05 one which is 24.9. The cost was 4.30. So the PE is 4.30/24.9? Because my calculator is telling me the PE it is 0.17... I'm thinking it should be a PE of 17, but I don't know where I went wrong
Saturday, May 28, 2011 at 11:30pm by Em
Physics
What potential energy does a 60.0-kg gymnast acquire in climbing 5.00 m up a vertical pole? GIVEN: mg = 60 h/d = 5.00 m PE = mgh PE = (60)(5.00) PE = 300 J
Monday, January 4, 2010 at 4:34pm by Priscilla
physics Bob Pursley plz help
ok so I calculate PE when R is (1/1.019)*3.38e6 and then calculate Pe when R is just 3.38e6? Or are you saying multiple (Pe)(1/1.019-1/1)?
Monday, November 30, 2009 at 5:00pm by Andy
8th grade physical science
Did I do these one correctly? A baby carriage is sitting on top of a hill that is 21 m high. The carriage with the baby wieghs 12N. Calculate the energy? PE= mgh PE= 12N(21m) PE= 252 Nm or do i multiply by 9.8m/s^2?
Thursday, January 19, 2012 at 11:33am by Misty
Physics Mehanics
your initial PE turns to final PE and final rotational KE, right? initial PE= mg(h/2) final PE= mg(0) rotational KE= 1/2 I w^2=1/2 I v^2/r^2
Thursday, February 24, 2011 at 2:13pm by bobpursley
Physics
letting the zero PE system at A, then initial PE=mga final PE =-mga cosAlpha-MG*2a*CosAlpha solve for cosAlpha, setting final=initialPE CosAlpha= 1/(-1-2)=-1/3 where alpha is measured from the vertical downward, clockwise
Saturday, May 26, 2012 at 6:14am by bobpursley
physics
PE=mgh=10•2=20 J. PE->KE
Friday, April 5, 2013 at 2:00pm by Elena
Physics
1. KE=original PE mgh 2. PE at bottom is zero
Saturday, September 22, 2012 at 6:48pm by bobpursley
Physics
What would the gravitation PE and Elastic PE be like on the moon?
Friday, June 24, 2011 at 1:20am by Janice
physics
What is the PE of the electron at 2cm? That PE must convert to KE.
Wednesday, March 5, 2008 at 2:37am by bobpursley
Physics
yes. KE+work= increase in PE+ original PE
Sunday, November 14, 2010 at 9:20pm by bobpursley
physics
PE = mgh m=PE/gh= 800/6•9.8= 13.61 kg
Thursday, May 2, 2013 at 10:03am by Elena
Physics
Assuming PE and h are measured from ground level, solve for h in PE=mgh
Tuesday, November 30, 2010 at 1:05am by MathMate
Physics
A 2000-kg truck is raised 15 m in an elevator. What is the increase in its potential energy? GIVEN: mg = 2000 kg h = 15 m PE = mgh PE = (2000)(15) PE = 30,000 J
Monday, January 4, 2010 at 4:36pm by Priscilla
physics
the gravitational constant G =6.67•10⁻¹¹ N•m²/kg², PE₁=G•m₁•m₂/R₁ PE₂=G•m₁•m₂/R₂ E=ΔPE= PE₁-PE&#...
Sunday, November 25, 2012 at 10:35pm by Elena
Economics
That came out badly Retype PE = Market value per share/EPS EPS = net income-dividends/no of shares available EPS = 417000000-0/19000000 EPS = 21.94 PE = 2.08/21.94 PE = 0.09
Saturday, May 28, 2011 at 3:24pm by Em
pe
missed school cause I had flu. now haf to write 5 papers for pe.
Wednesday, March 2, 2011 at 1:42am by pam
physics
The change is PE is kQ1*Q2(1/Ri - 1/Rf) What you computed is potential, not PE
Wednesday, March 4, 2009 at 10:36pm by drwls
physics
Initial PE= Final PE mgh=mg2+ 1/2 k(h-12)^2 check my thinking.
Wednesday, April 23, 2008 at 1:58pm by bobpursley
AP PHYSICS
The PE at infinity is zero. THe PE at r is Vq which is equal to q^2/r Watch units.
Wednesday, March 26, 2008 at 6:02pm by bobpursley
Physics
PE=CU²/2 U=sqrt{2•PE/C}
Monday, February 18, 2013 at 3:18pm by Elena
PE
any common activities between PE and science
Thursday, September 27, 2012 at 3:11am by Salah
PHYSICS
Vq= PE kq1*q2/r=PE
Wednesday, February 24, 2010 at 8:24pm by bobpursley
Accounting
a. UR b. PE c. AE d. AR e. PE
Sunday, July 26, 2009 at 10:46pm by Jesse
Physics
a. put a coordinate system where one is fixed. The potential energy of the other is GMM (1/.24-1/.29) that is PE of the starting position minus the final position (24cm cneter to center). That PE turns to KE (1/2 M V2),but in reality, both are moving, so the KE is divided ...
Thursday, November 4, 2010 at 4:15pm by bobpursley
mechanics_ physics
PE -> PE(spring) mgh =kx²/2 x=sqrt(2mgh/k)
Sunday, January 6, 2013 at 1:31am by Elena
Economics
Where did you find a PE of 0.09? Which company? I've never seen such a low PE.
Saturday, May 28, 2011 at 3:24pm by Ms. Sue
11th grade Physical Science
1/2 m v^2=Ke v= sqrt 2KE/m PE=mgh h= PE/mg
Monday, November 2, 2009 at 6:07pm by bobpursley
Physics
a) mechanical energy= PE+KE PE= m(mearth*g*(Re/(Re+altitude)) *^2* altitude KE= 1/2 m v^2 where v is found by mv^2/(Re+h)= PE/h solve for v. b) mechanical energy at end? zero
Thursday, November 17, 2011 at 8:08am by bobpursley
PE
does gravity affect PE activities?
Thursday, September 27, 2012 at 3:11am by bobpursley
Physics
change in PE=change in KE PE=1/2 mass(1130^2-(3*1130/4)^2 ) Now PE change is Mass*GMm/(altitude+radiusmoon) so you have to look up the mass of the moon Notice the mass divides out.
Sunday, November 15, 2009 at 2:28pm by bobpursley
Physics Urgent
A 3.2 kg block is hanging stationary from the end of a vertical spring that is attached to the ceiling. The elastic potential energy of this spring/mass sytem is 2.2 J. What is the elastic potential energy of the system when the 3.2 kg block is replaced by a 5.6 kg block? For ...
Tuesday, April 24, 2007 at 5:26pm by Papito
science
It is pretty easy... consider energy. The ball has an initial KE, and initial PE. The ball has a final PE you know, so calculate the final KE. Intialtotalenergy= final PE+finalKE
Friday, January 22, 2010 at 9:02pm by bobpursley
physics
Halfway? starting energy= 1/2 k .358^2 that is PE PE at half way= 1/2 k (.358/2)^2=1/4 starting PE so KE must be 3/4 starting energy. 1/2 m v^2= 3/4*1/2 k (.358)^2 solve for v.
Saturday, November 20, 2010 at 5:45pm by bobpursley
physics
a squirt gun is tied to a string and released when it is 1 meter above the ground. the mass of the gun is .1kg. what ist its initial PE? 1Joule what is its PE when it has fallen to .75meters? .75 J What is its KE at this point? .25 J What is its velocity? 0 m/s Above is the ...
Monday, January 28, 2013 at 11:27pm by Anonymous
pe
pe and science objectives
Friday, November 2, 2012 at 3:15am by salah
Physics
PE -> KE, PE=KE, KE=m•v²/2, PE=m•g•h, m•g•h =m•v²/2, v=sqrt(2 g•h).
Monday, June 11, 2012 at 3:14pm by Elena
physics
PE at top=PE at launch+Initial KE I recommend you change feet to meters... mgh=mg(distancehigh)+1/2 m vi^2 solve for h.
Saturday, January 5, 2013 at 3:29pm by bobpursley
Physics
PEhightest: mgh PE at catch: mgh For the last two, you have to know more, like the angle it was hit at. Lets assume then it had no horizontal velocity, so all KE was vertical velocity. KE caught then is the difference between PE hightest and PE caught mg(21.8-2.5) Velocity ...
Wednesday, October 24, 2012 at 7:38pm by bobpursley
biology
I have a question about reduced and oxidized chemicals and potenital enery. Reduced have weaker PE because they hold on to their electrons and oxidized have strong PE because they can let go electrons right? If I am right then why is that CO2 has a low PE because Oxygen is ...
Tuesday, October 20, 2009 at 2:39pm by Anonymous
quantum physics
a) follows from conservation of energy: Photon energy + m = photon energy after collision plus gamma m (in c = 1 units) In b) you have to take into account that both the photon after the collision and the electron after the collison are not moving in the same direction the ...
Wednesday, May 7, 2008 at 6:08pm by Count Iblis
Physics
All of the gravitational PE the idiot has must translated to elastic PE mgh=1/2 k x^2 mg*32=1/2 k x^2 so my question is x. How long is the stretched cord? It is not clear to me where it is attached.
Monday, October 12, 2009 at 2:11am by bobpursley
PHY
PE at the surface: GMm/r but you are given g=Force/mass=GM/r^2 =.77 PE at Surface then=GMm/r*r/r=mgr escape velocity for KE=PE 1/2 mV^2=mgr Vescape= sqrt (2gr) checking book answer Vesc=sqrt(2*.77*1.2E6)=text answer.
Thursday, July 5, 2012 at 3:35pm by bobpursley
Physics
The PE is maximum when the spring is compressed or stretched. KE develops when the spring is moving. KE+ PE= constant. So, at the neutral point, where PE is zero, that is where KE is maximum, ie, it is moving fastest at that point.
Thursday, June 23, 2011 at 5:51pm by bobpursley
physics
Assume the fixed electron is at zero PE, zero KE. Then the PE of the original electron is -ke^2/1E-15 at the new position, energy is conserved, so new PE+KE=original PE -ke^2/1E-15=-ke^2/1E-3 + KE find KE, then KE= 1/2 m v^2
Tuesday, July 3, 2012 at 5:38pm by bobpursley
physics
KE of the objects transforms into PE, and then PE→KE => v(start) =v(land)
Wednesday, November 7, 2012 at 11:14am by Elena
Physics
work= PE1-PE= q1V1-q2V2=.25 (-30)=-7.5J PE change = - work done
Monday, April 18, 2011 at 3:42pm by bobpursley
AP PHYSICS
That is not the correct answer. I did (Initial KE+ Initial PE)- (FinalKE+Final PE)= losses
Saturday, November 13, 2010 at 9:42am by Indina
physics
(PE+KE)initial = (PE+KE)final mgh + mv0^2/2 = 0 + mv^2/2 => h = (v^2-v0^2)/2g
Thursday, August 23, 2012 at 6:51am by Ajayb
physics
PE= mgh for the top boulder, M is larger, and h is larger than the other bolder. So which has the greater PE?
Monday, December 7, 2009 at 9:50am by bobpursley
college physics
well, if amplitude is 1/2, and PE is related to the square of amplitude, then PE must be 1/4, so KE is 3/4 max, so ratio is 3/1 check my thinking.
Wednesday, June 29, 2011 at 7:21pm by bobpursley
Physics
when the KE is = PE... PE=k(Q)q/d where Q is the +charge on the gold nucleus, q is the charge on the alpha particle
Sunday, February 10, 2013 at 8:43pm by bobpursley
physics
h = s•sinα =10•0.5 = 5 m PE = m•g•h =50•9.8•5=2450 J. W =ΔPE =2450 J.
Monday, April 30, 2012 at 8:15am by Elena
Physics
a. work=avgforce*distance b.PE=above work. KEwhenreleased=InitialPE d. zero, no PE, it has KE. e. Initial energy=1/2 m v^2 solve for v.
Monday, May 10, 2010 at 2:59pm by bobpursley
physics
You're quite right, the deceleration as calculated above accounts for gravity, but the force does not. From v=14, v1=0, we calculate a=(14²-0²)/2/2m=49 F=ma=65*49=3185 N On this we have to add the weight of the diver, 65*9.8 to give 3822 N. As suggested ...
Thursday, December 24, 2009 at 11:15am by MathMate
Physics E&M
We need to find the work done by the proton and the other two electrons on one electron in moving it in from infinity to its final location.. Then triple it. I will call a side of the triangle s You can put in the nanometer later. I will call proton +q, electron -q Now in ...
Monday, February 18, 2008 at 4:41pm by Damon
Physics URGENT!!!!
KE=1/2 m v^2 force*distance=workaborbed=KEinitial 2. change in PE= 1400*g*6m change in PE=finailKE-initialKE = 1/2 m (15^2-7^2)
Saturday, April 9, 2011 at 8:48pm by bobpursley
physics Bob Pursley plz help
Find the total PE available PE=GMm/Re (1/2.019 -1/1) Now, that has to be the work done heat+finalKE=work done
Monday, November 30, 2009 at 5:00pm by bobpursley
PE
list the common objectives between science curriculum and PE curriculum ?
Wednesday, September 26, 2012 at 4:52am by Salah
Physics
PE = 0.0061 kg * g * 0.017 m = 0.010 J KE = PE = 0.010 J
Monday, October 26, 2009 at 9:28pm by MathMate
PE
what is the common objectives between science curriculum and PE curriculum ?
Wednesday, September 26, 2012 at 12:48am by Salah
PE
what is the common objectives between science curriculum and PE curriculum ?
Tuesday, September 25, 2012 at 3:59am by Salah
phisics
KE= 1/2 m v^2 PE=mgh Total energy= KE + PE
Wednesday, April 7, 2010 at 4:40pm by bobpursley
college
the initial KE at bottom of ramp= change in PE of gravity+ change in PE of spring KEbottom=mgh+1/2 k^x^2 be certain to measure h from the base to the final position at the top for the mass.
Saturday, November 21, 2009 at 11:44am by bobpursley
Physics
a. PE = mgh = 0.28 * 9.8 *1.5 = 4.1J. b. PE = 0.28 * 9.8 * 4.8 = 13.2 Joules. c. Change = mg(h1+h2) - 0 = 0.28 * 9.8 * (1.5+4.8) - 0 = 17.3J.
Tuesday, September 27, 2011 at 7:09pm by Henry
Physics
Simple. The energy to do this will be equal to the PE the system has: PE=k(Q1*Q2)/d12 +k(Q1Q3)/d13 +kQ2Q3/d23 And what is neat, you do this by moving only two charges, that puts all three infinitely apart.
Sunday, February 10, 2013 at 8:40pm by bobpursley
physics
It is the same as the initial PE. Initial PE= mgh
Monday, April 30, 2012 at 8:53pm by bobpursley
physics
A satellite has a mass of 100 kg and is in an orbit at 2.00*10^6 m above the surface of the Earth (a) what is the potential enegry of the satellite at this location?(b) what is the magnitude of the gavitational forece on the satellite? a) Since the weight drops somewhat as a ...
Monday, January 8, 2007 at 4:54pm by becky
physics
The change of potential energy is ΔPE =mgΔh Work W = ΔPE
Friday, June 1, 2012 at 5:41pm by Elena
physics
Between h1 and h2 she has lost this amount of PE=mg(h1-h2), which is the PE change. lossEnergy=PEchange-KE
Sunday, September 30, 2012 at 9:00pm by bobpursley
Physics
pe=mgh (50)(9.81)(1000)=491000J KE=1/2mv^2= (.5)(50)(5)^2=625J Energy Lost= PE-KE=491000-625= 490375
Tuesday, December 5, 2006 at 1:08pm by bo
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