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A screw jack 25% efficient and having a screw pitch of 0.4cm is used to...

A screw jack 25% efficient and having a screw pitch of 0.4cm is used to raise a load through a certain height. If in the process, the handle turns through a circle of radius 40cm; Calculate
(i) Velocity ratio of the machine.
(i) Mechanical Advantage of the machine.?

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