Rotational MotionAngular Momentum (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 21  24 of 29
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Question number: 21
» Rotational Motion » Angular Momentum
Question
Calculate the angular momentum of a body whose rotational energy is 5 joule. If the angular momentum vector coincides with the axis of rotation and its moment of inertia about this axis is 3 x 10 ^{8} kg m ^{2}
Choices
Choice (4)  Response  

a.  4 x 10 ^{3} kg m ^{2} /s 

b.  5.47 x 10 ^{2} kg m ^{2} /s 

c.  2 x 10 ^{3} kg m ^{2} /s 

d.  Question does not provide sufficient data or is vague 

Question number: 22
» Rotational Motion » Angular Momentum
Question
A round disc of moment of inertia I _{2} about its axis perpendicular to its plane and passing through its center is placed over another disc of moment of inertia I1 rotating with an angular velocity co about the same axis. The final angular velocity of the combination of discs is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 23
» 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 4500 revolutions per minute. The angular acceleration of the wheel is
Choices
Choice (4)  Response  

a.  1980 degree/sec ^{2} 

b.  40 rad/sec ^{2} 

c.  30 rad/sec ^{2} 

d.  1880 degree/sec ^{2} 

Question number: 24
» Rotational Motion » Angular Momentum
Assertion (Ꭺ)
Torque is equal to rate of change of angular momentum.
Reason (Ꭱ)
Angular momentum depends on moment of inertia and angular velocity.
Choices
Choice (4)  Response  

a.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ 

b.  Ꭺ is false but Ꭱ is true 

c.  Both Ꭺ and Ꭱ are false 

d.  Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ 
