Rotational Motion (NEET Physics): Questions 93  96 of 123
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Question number: 93
» Rotational Motion » Angular Momentum
Question
A uniform rod of length 4L is placed with one end in contact with the horizontal and is then inclined at an angle 60 ^{0} to the horizontal and allowed to fall without slipping at contact point. When it becomes horizontal, its angular velocity will be
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 

Question number: 94
» Rotational Motion » Rotational Kinetic Energy
Question
Two disc, each having moment of inertia 5 kg m ^{2} about its central axis, rotating with speeds 10 rad s ^{1} and 20 rad s ^{1}, are brought in contact face with their axes of the rotation coincided. The loss of kinetic energy in the process is,
Choices
Choice (4)  Response  

a.  125 J  
b.  5 J  
c.  0 J  
d.  2 J 
Question number: 95
» Rotational Motion » Moment of a Force
Question
A flywheel of mass 25 kg has a radius of 0.3 m. What force should be applied tangentially to the rim of the flywheel so that it acquires an angular acceleration of 4 rad s ^{2}?
Choices
Choice (4)  Response  

a.  6.8 N  
b.  11.2 N  
c.  7.5 N  
d.  2.6 N 
Question number: 96
» Rotational Motion » Moment of Inertia
Assertion (Ꭺ)
If two different axes are at same distance from the centre of mass of a rigid body, then moment of inertia of the given rigid body about both the axes will always be the same.
Reason (Ꭱ)
From parallel axis theorem, where all terms have usual meaning.
Choices
Choice (4)  Response  

a.  Ꭺ is true but Ꭱ is false  
b.  Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ  
c.  Ꭺ is false but Ꭱ is true  
d.  Both Ꭺ and Ꭱ are false 