A 1000-W motor power a hoist used to lift cars at a service station. How much time would it take to raise a 1,200kg car 2m? If it is replaced with a 2,000W motor, how long would it take?
PW/t W1200*9.8*223520 J t1W/P23520J/1000W23.52 sec t2W/P23520J/2000W11.76 sec
t W/P mgh/1000 (1200)(9.81)(2)/1000 23.5 seconds 2000W motor would do it in half the time, 11.8 seconds.
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