Centre of Mass & Rotational Motion · JEE Main previous year questions

2004 2 questions

1. Q842004 · 24 Apr 2004 · Shift 1

   A solid sphere is rotating in free space. If the radius of the sphere is increased keeping mass same which one of the following will not be affected ?

   1. A.Angular velocity
   2. B.Angular momentum
   3. C.Moment of inertia
   4. D.Rotational kinetic energy
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   Answer: B

2. Q852004 · 24 Apr 2004 · Shift 1

   One solid sphere $A$ and another hollow sphere $B$ are of same mass and same outer radii. Their moment of inertia about their diameters are respectively $I_A$ and $I_B$ such that

   1. A.$I_A<I_B$
   2. B.$I_A>I_B$
   3. C.$I_A=I_B$
   4. D.$\frac{I_A}{I_B}=\frac{d_A}{d_B}$ where $d_A$ and $d_B$ are their densities.
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   Answer: A