A screw jack has a single start thread of pitch 6 mm and is used to raise a load of 250kg

A screw jack has a single start thread of pitch 6 mm and is used to raise  a load  of 250kg . The  required effot is 20N applied at the end of an operating handle 550mm long.  For these  operating  conditions determine:
The Mechanical Advantage
The Velocity Ratio
The Efficiency


Price: £ 36

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