A machine is operated by a power of 50 N and the power has a downward displacement of 0.25 m in raising a load of mass 100 N through 10 cm. Calculate M.A., V.R. and efficiency.

Explanation

`M.A.=("Load")/("Power") = 2`
`V.R. = ("displacement of the power")/("displacement of the load")`
V.R. = `(0.25)/(0.10)` = 2.5
`eta = (M.A.)/(V.R.) = (2)/(2.5) = 0.8`
`eta% = 0.8 xx 100 = 80%`