Homework Help: physical science

Posted by t on Thursday, June 23, 2011 at 2:19pm.

How long would it take a 20.0 hp motor to lift a 1,000.0 kg crate from the bottom of a freighter's hold to the deck (40.0 m)?

physical science - drwls, Thursday, June 23, 2011 at 2:34pm
The work required is
M*g*H = 1000*9.81*40 = 3.92*10^5 Joules

A 20 HP motor can provide 20*746 = 14,920 watts (J/sec) of power.

Time= Work/Power

I get 26.3 seconds

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