A crane lifts a weight of 1000 N through a vertical height of 30 m. It uses 60 000 J of energy. What is the efficiency of the crane? A 20% B 30% C 50% D 200%
Answers
Answered by
1
Explanation:
Correct option is A)
Given : m=600kg h=20 m
Time of operation t=2 min =120 s
Work done in lifting a box W=mgh=600×10×20=120000
Power required P=
tW =
120
120000
=1000 watts
Solve any question of Work, Energy and Power with
Answered by
0
Answer:
Explanation:
efficiency =output/input *100
mgh/60000 *100
1000*30/60000 *100
50%
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