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work input/output, efficiency....help!?
a construction worker uses a block and tackle to lift 2,400 newtons of lumber from the ground to a waiting helper on the second floor, 4 meters from the ground. to do this, she applies a 250-newton force on the rope of the block and tackle. she pulls 50 meters of rope through the block and tackle beforethe load is lifted to the second floor. based upon the imformtion given, calcutate the following for this block and tackle
a. work input
b. work output
c. efficiency
1 Answer
- 1 decade agoFavorite Answer
Work = Force X Distance
Work (out) = 2400 (N) * 4 (M)
Work (in) = 250 (N) * 50 (M)
Efficiency = Work (out) / Work (in)
