Rotational Motion (NEET (NTANational Eligibility cum Medical Entrance Test) Physics): Questions 27  31 of 125
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Question number: 27
» Rotational Motion » Angular Momentum
Question
If the earth is treated as a sphere of radius R and mass M. Its angular momentum about the axis of rotation with period T is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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Question number: 28
» Rotational Motion » Angular Momentum
Question
A uniform heavy disc is rotating at constant angular velocity about a vertical axis through its center and perpendicular to the plane of the disc. Let L be its angular momentum. A lump of plasticize is dropped vertically on the disc and sticks to it. Which of the following will be constant?
Choices
Choice (4)  Response  

a.  a and L 

b.  a 

c.  L Only 

d.  All of the above 

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Question number: 29
» Rotational Motion » Torque
Question
A constant torque of 1000 N m, turns a wheel of moment of inertia 200 kg m ^{2} about an axis passing through the center. Angular velocity of the wheel after 3 s will be
Choices
Choice (4)  Response  

a.  1 rad/s 

b.  15 rad/s 

c.  10 rad/s 

d.  5 rad/s 

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Question number: 30
» Rotational Motion » Angular Momentum
Question
The angular momentum of a system of particles is conserved
Choices
Choice (4)  Response  

a.  When no external force acts upon the system 

b.  When axis of rotation remains same 

c.  When no external torque acts upon the system 

d.  When no external impulse acts upon the system 

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Question number: 31
» Rotational Motion » Torque
Question
A constant torque acting on a uniform circular wheel changes its angular momentum from Aq to 5Aq in 4 seconds. The magnitude of this torque is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


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