Final answer:
Using a pulley system with a mechanical advantage of 4, a person exerting a force of 250 N can lift a load up to 1000 N.
Step-by-step explanation:
If a pulley system has a mechanical advantage (MA) of 4, and a person can exert a force of 250 N, then multiplying the force by the mechanical advantage gives us the load that can be lifted. The mechanical advantage indicates how much the input force is multiplied to lift a load. Therefore, the calculation for the maximum load (L) that the person can lift using this pulley system is L = MA × force exerted by the person.
L = 4 × 250 N
L = 1000 N
So, the person can lift a load of 1000 N using the pulley system with a mechanical advantage of 4.