Rotational Motion (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 32  35 of 125
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Question number: 32
» 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} /8 and E _{A} = 50 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.  0. . 25 

b.  2.5 

c.  1.25 

d.  5 

Question number: 33
» 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: 34
» Rotational Motion » Torque
Question
A wheel having moment of inertia 2 kg m ^{2} about its vertical axis, rotates at the rate of 60 rpm about this axis. The torque which can stop the wheel’s rotation in 1 minute would be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 35
» Rotational Motion » Torque
Question
A horizontal force F is applied such that the block remains stationary, then which of the following statement is false
Choices
Choice (4)  Response  

a.  F = N [where N is the normal reaction] 

b.  F will not produce torque 

c.  N will not produce torque 

d.  f = mg [where f is the friction force] 
