Rotational Motion (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 16  21 of 125
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Question number: 16
» Rotational Motion » Torque
Question
Find the torque of a force F = i + 2 j + 3 k acting at the point r = i + 3 j + 5k
Choices
Choice (4)  Response  

a.  21i + 3j + 5k 

b.  i  8j + 5k 

c.  14i  38j + 16k 

d.  7i  19j + 19k 

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Question number: 17
» Rotational Motion » Torque
Question
Find the torque of a force F =3 i + j+5 k acting at the point r = 7 i + 3 j + k
Choices
Choice (4)  Response  

a.  21i + 3j + 5k 

b.  l4i + 38j 16k 

c.  4i + 4j + 6k 

d.  14i  38j + 16k 

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Question number: 18
» 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 

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Question number: 19
» Rotational Motion » Torque
Question
Find the torque of a force F =2 i + j+3 k acting at the point r = 5 i + 3 j + 2k
Choices
Choice (4)  Response  

a.  14i  38j + 16k 

b.  l4i + 38j 16k 

c.  21i + 3j + 5k 

d.  7i  19j + 19k 

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Question number: 20
» 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} 

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Question number: 21
» 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. 


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