Question

A crane is used to lift some building materials which weigh 112 kg from the ground to the top of a building.

If the building materials are being raised by an electrical winch at a speed of 2.13 m s−1 then at what rate is the winch using electrical power? (in W to 3 s.f)

Answer 1

electrical power used Force$\times$ Velocity

force$=112\times9.8N$

velocity$=2.13\frac{m}{sec}$

hence electrical power used$=112\times9.8\times2.13=2337.888W$