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phil555

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2. (a) A flywheel has a mass of 100 kg and a radius of gyration of 150 mm.

It is accelerated from 100 rev min–1 to 250 rev min–1 at a constant

rate in 15 s. Calculate the power required to produce this

acceleration.

(b) A hammer of mass 80 kg falls 4 m onto a pile of mass 200 kg and

drives it 80 mm into the ground. If the energy loss is 2.24 kJ during

impact, calculate:

(i) the velocity of the hammer immediately before impact

(ii) the common velocity immediately after impact.

If the post is in the wrong place please relocate.

All help appreciated.

Kind regards,

Phil.