Desperate need of : (
(this is the 2nd set of questions)

a 2 inch axle is driving a 12 inch wheel. the resistance force of the wheel is 75 ibs. how much effort force must be applied to the axel?

what's the ideal mechanical advantage of the wheel and axel?

a moveable pulley is used to lift an object that weighs 100 ibs. what's the ideal mechanical advantage of the pulley?

for the pulley, ideally how much effort force will be required to lift the object?