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Derive a relationship between mechanical...

Derive a relationship between mechanical advantage, velocity ratio and efficiency of a machine.

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`M.A.=("Load")/("Effort")`
`V.R.=("Displacement of the effort")/("Displacement of the load")`
Efficiency, `eta=("Work output")/("Work input")`
`eta=(Lxxd_("load"))/(Exxd_("effort"))`
`eta=M.A.xx1/(V.R.)`
`eta=(M.A.)/(V.R.)`
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