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Grade 12Thermal Physics

A thin circular metal disc of radius 500.0 mm is set rotating about a central axis normal to its plane. Upon raising its temperature gradually, the radius increases to 507.5 mm. The percentage change in the rotational kinetic energy will be

Profile image of Rushil
7 Years agoGrade 12
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1 Answer

Profile image of Arun
7 Years ago
Dear Student
 
Rotational K.E. = L^2 / 2I
 
where L is angular momentu and I is momeny of inertia.
 
delta K /K = – delta I/ I = – 0.03
 
hence percentage increase = 3%
 

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