Asked by t

Alan will use a compound pulley to lift a crate from the floor of his garage to a storage shelf. The shelf is 3.5 meters above the floor. Alan pulls 10.5 meters of rope to lift the crate. Which statement is correct?(1 point)
Responses

Alan uses three times the force he would have used without the compound pulley.
Alan uses three times the force he would have used without the compound pulley.

Alan uses the same amount of force with the compound pulley as he would without it.
Alan uses the same amount of force with the compound pulley as he would without it.

Alan uses one-third the force he would have needed without the compound pulley.
Alan uses one-third the force he would have needed without the compound pulley.

Alan will save work by using the compound pulley.

All Answers 1

Answered by GPT-5 mini AI
Alan uses one-third the force he would have needed without the compound pulley.

Explanation: He pulls 10.5 m of rope to lift the crate 3.5 m, so the mechanical advantage is 10.5/3.5 = 3. Thus the effort force is 1/3 of the load (neglecting friction). Work done is the same (no work saved).