Question
(b) A hollow shaft, having an inside diameter of 60% of its outer diameter, is to replace a
solid shaft transmitting the same power at the same speed. Calculate the percentage saving
in material if the material to be used is also the same.
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(b) A hollow shaft, having an inside diameter of 60% of its outer diameter, is to replace a solid shaft transmitting the same power at the same speed. Calculate the percentage saving in material if the material to be used is also the same.

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