Rotational MotionAngular Momentum (NEET Physics): Questions 12  15 of 29
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Question number: 12
» Rotational Motion » Angular Momentum
Question
Two rigid bodies A and B rotate with rotational kinetic energies E _{A} and E _{B} respectively. The moments of inertia of A and B about the axis of rotation are I _{A} and I _{B} respectively. If I _{A} = I _{B} /4 and E _{A} = 100 E _{B}, the ratio of angular momentum (L _{A}) of A to the angular momentum (L _{B}) of B is
Choices
Choice (4)  Response  

a.  5 

b.  25 

c.  0.25


d.  1.25 

Question number: 13
» Rotational Motion » Angular Momentum
Question
The wheel of a car is rotating at the rate of 1200 revolutions per minute. On pressing the accelerator for 10 seconds, it starts rotating at 3500 revolutions per minute. The angular acceleration of the wheel is
Choices
Choice (4)  Response  

a.  1880 degree/sec ^{2} 

b.  1500 rad/sec ^{2} 

c.  30 rad/sec ^{2} 

d.  1980 degree/sec ^{2} 

Question number: 14
» Rotational Motion » Angular Momentum
Question
A thin circular ring of mass M and radius r is rotating about its axis with a constant angular velocity co. Four objects each of mass m, are kept gently to the opposite ends of two perpendicular diameters of the ring. The angular velocity of the ring will be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 15
» Rotational Motion » Angular Momentum
Question
A particle performs uniform circular motion with an angular momentum L. If the frequency of a particle’s motion is doubled and its kinetic energy is halved, the angular momentum becomes.
Choices
Choice (4)  Response  

a.  L/2 

b.  4 L 

c.  L/4 

d.  2 L 
