# Power and Energy

• Oct 28th 2009, 07:27 PM
jsu03
Power and Energy
Can someone help me with this problem? Thanks inadvance.

Skid is dragged kicking and screaming to Mike's Physics class. A force of 100 N is applied to Skid over a distance 50 m. If it takes 5 mins to do this, what is the power required? Must use energy methods to solve the problem

P = F d/t so first I tried plug in the values ? (50)/60 secs so I looking for F but what is F in this case. And how do I use energy methods in this case. Thanks again!!!!!!!!
• Oct 29th 2009, 05:18 PM
skeeter
Quote:

Originally Posted by jsu03
Can someone help me with this problem? Thanks inadvance.

Skid is dragged kicking and screaming to Mike's Physics class. A force of 100 N is applied to Skid over a distance 50 m. If it takes 5 mins to do this, what is the power required? Must use energy methods to solve the problem

P = F d/t so first I tried plug in the values ? (50)/60 secs so I looking for F but what is F in this case.

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• Oct 30th 2009, 02:38 PM
partyshoes
Power = ( Force X Distance ) / Time
=

( 100 X 50 ) / (5 X 60 )

= 5000/3000
in joules per second

Well, you have probly done this already but I think they want you to consider the fact that Skid is traveling with a constant velocity(speed) ,as Power = Force X Velocity