A load weighing 120 kg is lifted using a movable block, the efficiency of which is 80%.
| January 31, 2021 | education
A load weighing 120 kg is lifted using a movable block, the efficiency of which is 80%. What is the vertical force at the free end of the rope? The mass of the block and the friction in it can be neglected. The load moves evenly.
To determine the force of gravity, we use the formula:
F = m * g, m – body mass, g – free fall acceleration.
Then the force of gravity acting on the load is equal to:
F = 120 * 10 = 1200 N.
Since the load moves uniformly, the force applied to the other end will be equal to the force of gravity found above, taking into account the efficiency of the system:
1200 * 100/80 = 1500 N.
Answer: the value of the required force is 1500 N.
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