Rotational Motion (NEET Physics): Questions 84  88 of 123
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Question number: 84
» Rotational Motion » Conservation of Angular Momentum
Question
A cord is wound round the circumference of wheel of radius r. The axis of the wheel is horizontal and moment of inertia about it is I. A weight mg is attached to the end of the cord and falls from the rest. After falling through a distance h the angular velocity of the wheel will be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 85
» Rotational Motion » Radius of Gyration
Question
The radius of gyration of a disc of mass 200 g and radius 3.2 cm, about an axis passing through its center of gravity and perpendicular to the plane is
Choices
Choice (4)  Response  

a.  2.54 cm 

b.  1.06 cm 

c.  0.54 cm 

d.  2.26 cm 

Question number: 86
» Rotational Motion » Rigid Body Rotation Equations of Rotational Motion
Question
A wheel has a speed of 1200 revolutions per minute and is made to slow down at a rate of 4 rad /s ^{2}. The number of revolutions is makes before coming to rest is,
Choices
Choice (4)  Response  

a.  272 

b.  314 

c.  143 

d.  722 

Question number: 87
» Rotational Motion » Moment of Inertia
Question
Moment of inertia of a disc about its own axis is I. its moment of inertia about a tangential axis in its plane is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 88
» Rotational Motion » Values of Moments of Inertia
Question
A constant torque of 3.6 Nm is exerted on a pivoted wheel. If angular acceleration of wheel is 6π rad/sec ^{2}, then the moment of inertia of the wheel is
Choices
Choice (4)  Response  

a.  2.5 kgm ^{2} 

b.  1.21 kgm ^{2} 

c.  0.6 kgm ^{2} 

d.  2.5 kgm ^{3} 
