a crane pulls up a car weighing 500 kg to a vertical height of 4m in 10s.calculate the power of crane.
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Answer:
To raise the car, the crane has to do work against the force of gravity.
Therefore, the force required to lift the car, F=mg=500×9.8N=4900N
Displacement, S= vertical height raised =4m.
∴ Work done, W=F.S=4900×4J=19600J=19.6kJ
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4
Answer: The answer is 2000J
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