Question

If a pulley system with an actual mechanical advantage of 2,000,000 is used in lifting a 2,000 lb. car, what effort would be needed to move the car?

Answer 1

0.001 lb

Step-by-step explanation:

The mechanical advantage of a pulley system is given by:

`MA=(F_L)/(F_E)`

where FL is the load while FE is the effort.

In this problem, we know the mechanical advantage, MA=2,000,000, and we know the value of the load, FL=2,000 lb, so we can re-arrange the equation to find the effort:

`F_E=(F_L)/(MA)=(2,000 lb)/(2,000,000)=0.001 lb`