Rotational Motion (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 85  90 of 125
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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} 

Question number: 89
» Rotational Motion » Angular Momentum
Question
An inclined plane makes an angle 45° with the horizontal. A solid sphere rolling down this inclined plane from rest without slipping has a linear acceleration equal to,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 90
» Rotational Motion » Moment of Inertia
Question
Four thin rods of same mass M and same length l form a square as shown in figure. Moment of inertia of this system about an axis through center O and perpendicular to its plane is,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

