Question

250 N force is required to raise 75 kg mass from a pulley.

Answer 1

Load W= Mg=75×10=750N Effort(P)= 250N Mechanical advantage= Load÷effort= W/P =750/250=3. Velocity ratio = distance travelled by effoet÷distance travelled by load = 12/3= 4 Efficiency n=Mechanical advantage÷Velocity ratio =(3/4)×100= 75%