Does anybody know how to answer this physics question? It's on Work, Power and Energy. Help please!!!
Favorites|Homepage
Subscriptions | sitemap
HOME > > Does anybody know how to answer this physics question? It's on Work, Power and Energy. Help please!!!

Does anybody know how to answer this physics question? It's on Work, Power and Energy. Help please!!!

[From: ] [author: ] [Date: 12-05-22] [Hit: ]
125 W-I Dont no sorry i tryed to figure it out but then i searched and found it answered on Enotes.com just copy and past that formula on google and it should pop up with the link to the Answer Good Luck!-Never mind.It looks like the other guy got it fine.......
A 1.5 X 10^3 kg vehicle accelerates from rest to a velocity of 15.0 m/s in 6.00 s. Determine the output of power in the car in this 6.00 s.

-
At the end of the 6s, the car has kinetic energy KE = 1*2 m*V^2
= 750*15^2 = 168,750J
Power = Energy per unit time = 168,750/6 = 28,125J/s = 28,125 Watts = 28.125kW

Another way to calculate this is
F = ma
a = [Vf-Vi]/[t2-t1] = 15/6 = 2.5m/s^2
F = 1500*2.5 = 3750N
Solve for d = 1/2 *a*t^2 = 1.25*36 = 45m
Now use Work = F*d = 3750*45 = 168,750J
168,750/6 = 28, 125W same answer

-
KE = 0.5 MV^2

KE = 0.5 * 1.5 * 10^3 kg * (15 )^2m/s

KE = 168,750 J

Pwr = KE/Time = 168,750 J / 6 s = 28,125 J/s = 28,125 W

-
I Dont no sorry i tryed to figure it out but then i searched and found it answered on Enotes.com just copy and past that formula on google and it should pop up with the link to the Answer Good Luck!

-
Never mind. It looks like the other guy got it fine.
1
keywords: please,and,this,039,anybody,answer,physics,know,question,Does,on,Energy,to,Work,It,how,Power,Help,Does anybody know how to answer this physics question? It's on Work, Power and Energy. Help please!!!
New
Hot
© 2008-2010 http://www.science-mathematics.com . Program by zplan cms. Theme by wukong .