The worker, using a movable block, lifted the load to a height of 7 m, applying a force of 160 N
| February 13, 2021 | education
The worker, using a movable block, lifted the load to a height of 7 m, applying a force of 160 N. to the free end of the rope. What work did he do? Disregard the friction force. Unit weight equal to 20 N.
Given: l1 = h = 7 m; F = 160 N; P1 = 20 N
Find: A -?
When solving this problem, we use a solution known to us, namely, that the movable block gives a 2-fold gain in strength:
F = P / 2; A = (P + P1) * h = (2F + P1) * h = (2 • 160 + 20) * 7 = 2380 J
Answer: A = 2380 J
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