The velocity ratio and efficiency of a system of pulleys are 6 and 80% respectively….

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
  • E.
    960N
Correct Answer: Option D
Explanation
Efficiency =

M.A/V.R

x 100%

=

80/100

=

120 x 10/E

E = 250N

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