Question

Imagine you're using a pulley system to lift a box that weighs 100 lbs, but the pulleys are only 50% efficient.How many pounds of force are you actually putting into moving the box?

a.)75
b.)150
c.)200
d.)10

Answer 1

c

Step-by-step explanation:

50% = 1/2

1/2 reciprocal = 2

2*100 = 200

Answer 2

The actual force being put into moving the box is 50 lbs due to the 50% efficiency of the pulleys.

Step-by-step explanation:

In a pulley system, the efficiency is defined as the ratio of the output force to the input force. In this case, the pulleys are only 50% efficient, which means that only half of the input force is used to lift the box.

The weight of the box is 100 lbs, so the input force required to lift it would be 100 lbs. However, due to the 50% efficiency, only half of that force is used. Therefore, the actual force being put into moving the box is 50 lbs.

Therefore, the correct answer is option d) 50 lbs.