Question #324572

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)





note: use g = 9.81 m s−2.






1
Expert's answer
2022-04-11T12:04:17-0400

The electrical power

P=Wt=mght=mgvP=\frac{W}{t}=\frac{mgh}{t}=mgv

P=1129.812.13=2340WP=112*9.81*2.13=2340\:\rm W


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