A cart of weight 10 N is pulled 12 m up a ramp by an ap
|
A cart of weight 10 N is pulled 1.2 m up a ramp by an applied force of magnitude 5.0 N (parallel to the ramp), raising the cart 0.50 m above its initial level. Calculate percent efficiency of the work?
A.
83.33%
B.
85%
C.
84.5%
D.
86.33%
Please scroll down to see the correct answer and solution guide.
Right Answer is: A
SOLUTION
Weight of the cart = 10 N
Vertical height = 0.5 m
Energy output = Potential energy
=m×g×h
=10×0.5=5J
Energy input = Work done to move the cart
=Force×displacement
=5×1.2=6J
Percentage efficiency =Energy outputEnergy input = 56 ×100
= 83.33%