1.

A solid cyclinder of mass 4 kg and radius 20 cm is rotating about its axis with a frequency of 10//pi Hz. What is the rotational kinetic energy of the cylinder?

Answer»

4 J
8 J
16 J
32 J

Solution :`E_(ROT)=(1)/(2)Iomega^(2)=(1)/(2)((1)/(2)MR^(2))(2piv)^(2)`
`=(1)/(2)((1)/(2)xx4xx((20)/(100))^(2))(2pi.(10)/(pi))^(2)`
`=(4)/(100)xx400=16J`


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