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A jack of pitch 4 mm is worked by a hand...

A jack of pitch 4 mm is worked by a handle of length 50cm .There is friction between the screw and the nut of it. To overcome the frictional force an extra effort of 0.004 times the load has to be applied . Calculate the least force required to raise and lower a load of 500 kg (take `g=10 ms^(-2)`)

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The correct Answer is:
26.36 N,13.6 N
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