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• AIPMT 2010 Physics

AIPMT 2010 Physics

  

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. 
   
3. 
     
4. 
    

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)