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AP EAMCET2015PhysicsRotational Motion

The kinetic energy of a circular disc rotating with a speed of 60 r.p.m. about an axis passing through a point on its circumference and perpendicular to its plane is (mass of circular disc =5 ~kg , radius of disc =1 ~m ) approximately

Options

  1. A170 J
  2. B160 J
  3. C150 J
  4. D140 J

Correct answer

C. 150 J

Step-by-step solution

KE = 1 2 I ^2= 1 2 3 2 m r^2 4 ^2 f ^2 aligned & KE =3 m r^2 ^2 f ^2=3 5 1 10 1 & KE =150 ~J aligned

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