Movement 43831

The crane motor has a constant power of 9 kW. With constant movement, how long does it take to lift a body weighing 12 tons to a height of 9 m?

Correct answer:

t =  120 s

Step-by-step explanation:

P=9 kW W=9 1000  W=9000 W m=12 t kg=12 1000  kg=12000 kg h=9 m  g=10 m/s2  F=m g=12000 10=120000 N  W=F h=120000 9=1080000 J  t=W/P=1080000/9000=120 s



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