Asked by Kelly

A skier of mass 70 kg is pulled up a slope by a motor-driven cable. (a) How much work is required to pull him 60m up a 30 degree slope (assumed frictionless) at a constant speed of 2.0 m/s? (b) What power must a motor have to perform this task?

Answered by bobpursley
he changes height by 60 sin30

work= mgh
power= mgh/T= mg d*sin30/T= mgv/2
Answered by Kelly
I keep getting a number that is very large for (a). Is mg 70kg * 9.81?
Answered by Bob
Yes, the expression of Joules is generally very large when dealing with human beings moving slow, or small projectiles moving fast.
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