AIPMT 2010 Physics

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Q. 7. A circular disk of moment of inertia  is rotating in a horizontal plane, about its symmetry axis, with a constant angular speed . Another disk of moment of inertia Ib is dropped coaxially onto the rotating disk. Initially the second disk has zero angular speed. Eventually both the disks rotate with a constant angular speed  . The energy lost by the initially rotating disk to friction is:




  1.   

  2.  

Sol. 

Answer : (4)

Q. 8. The displacement of a particle along the x-axis is given by x = a sin2 ωt. The motion of the particle corresponds to:

  1. Simple harmonic motion of frequency ω/π
  2. Simple harmonic motion of frequency 3ω/2π
  3. Non simple harmonic motion
  4. Simple harmonic motion of frequency ω/2π

Sol.    

Answer : (1)

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