A machine whose efficiency is 60% has a velocity ratio of 5. If a force of 500N is applied to lift a load P, what is the magnitude of P?
-
1500N
- 500N
- 4166N
- 750N
The correct answer is: A
Explanation
efficiency = (M.A / V.R) x 100/1 => 60/100 = M.A/5∴M.A = (60 X 5) / 100 = 3
But M.A = Load/Effort; => 3 = Load/500
∴Load = 500 x 3
= 1500N