A body of mass 7.5 kg is to be pulled up along a plane which is inclined at 30o to the horizontal. If the efficiency of the plane is 75%, what is the minimum force required to pull the body up the plane?
(g = 10ms-1)
a
5.0 N
b
20.0 N
c
50.0 N
d
75.0 N
e
200.0 N
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OmolewaPhelan
5 years ago
V.R= 1/ sin¢
V.R=>1/sin 30
= 1/1/2
= 2
Efficiency = MA/ VR × 100%
75%= MA/ 2×100
75/100=MA/2
MA= 1.5
Note that weight= Load= Mg
= 7.5×10
=75
MA= Load/Effort
1.5= 75/ E
E= 75\1.5
E= 50N
