Sin
A screw jack is used to raise a body of mass 6000kg through a height of
0.25m by turning i...
Sin
A screw jack is used to raise a body of mass 6000kg through a height of
0.25m by turning its tommy bar through 30 revolutions. If the length of its
tommy-bar. is 0.75m and the jack is 85% efficient, calculate
(ii)
its velocity ratio,
the effort required to raise the body.
[T = 3.14, g = 10ms)
Answers: 3
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