A 60N motor winds a cable around a drum. (I) If the cable lifts a 3-ton load of bricks to a height of 12cm in 5 sec, calculate the efficiency of the motor. (II) At what rate is work done against friction?
Given:
F=60 kNF=60\:\rm kNF=60kN
m=3000 kgm=3000\:\rm kgm=3000kg
h=0.12 mh=0.12\:\rm mh=0.12m
t=5 st=5\:\rm st=5s
(a)
(b)
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