The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively.
PHYSICS
WAEC 1996
The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively. How much effort is required to lift a load of mass 120kg with this system? (g=10ms-2)
- A. 25N
- B. 90N
- C. 96N
- D. 250N
Correct Answer: D. 250N
Explanation
Efficiency =
M.AV.R
x 100%=
80100
=120 x 10E
E = 250N
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