Homework Help: Physics

Posted by Lina on Thursday, June 2, 2011 at 9:35am.

A lift is pulled up to the top of a building by a constant force of 6400N at a constant speed of 2m/s. It takes 3mins to reach the top.
(a) how much work is done in raising the lift to the top of the building ?
(b) what is the power required ?

Physics - drwls, Thursday, June 2, 2011 at 9:56am
(a) Force * distance =
6400 N * (2 m/s*180 s)= 2.304*10^6 J

(b) Work/time = 2.304*10^6 J/180s
= ___ Watts
Physics - Lina, Thursday, June 2, 2011 at 10:45am
Thanks !!! :)

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