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Question
A ring of mass m and radius r rotates about an axis passing through its centre and perpendicular to its plane with angular velocity `omega`. Its kinetic energy is ______.
Options
`0.5 "mr"omega^2`
`0.5 "mr"^2 omega^2`
`"mr"omega^2`
`"mr"^2 omega^2`
MCQ
Fill in the Blanks
Solution
A ring of mass m and radius r rotates about an axis passing through its centre and perpendicular to its plane with angular velocity `omega`. Its kinetic energy is `underlinebb(0.5 "mr"^2 omega^2)`.
Explanation:
`"K.E" = 1/2 "I"omega^2 = 0.5 "mr"^2 omega^2`
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