The velocity ratio of a machine is 5 and its ef... - JAMB Physics 2000 Question
The velocity ratio of a machine is 5 and its efficiency is 75%. What effort would be needed to lift a load of 150N with the machine?
A
20N
B
30N
C
40N
D
50N
correct option: c
Efficiency = M.A/V.R
75% = M.A/V.R
75/100 = M.A/5
M.A = 75(5)/100 = 3.75
But M.A = Load/Effort
3.75 = 150/Effort
Effort = 150/3.75
Effort = 40N
75% = M.A/V.R
75/100 = M.A/5
M.A = 75(5)/100 = 3.75
But M.A = Load/Effort
3.75 = 150/Effort
Effort = 150/3.75
Effort = 40N
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