Rotational Motion (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 76  79 of 125
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Question number: 76
» Rotational Motion » Radius of Gyration
Question
The radius of gyration of a disc of mass 50 g and radius 2.5 cm, about an axis passing through its center of gravity and perpendicular to the plane is
Choices
Choice (4)  Response  

a.  1.76 cm 

b.  6.54 cm 

c.  0.52 cm 

d.  3.54 cm 

Question number: 77
» Rotational Motion » Moment of Inertia
Question
Two rings of the same radius and mass are placed such that their centers are at a common point and their planes are perpendicular to each other. The moment of inertia of the system about an axis passing through the center and perpendicular to the plane of one of the rings is (mass of the ring = m and radius = r)
Choices
Choice (4)  Response  

a. 


b.  2 

c. 


d. 


Question number: 78
» Rotational Motion » Torque
Question
A thin wire of length L and uniform linear mass density ρ is bent into a circular loop with center at O as shown in figure. The moment of inertia of the loop about the axis XX’ is
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 79
» Rotational Motion » Moment of Inertia
Question
Two discs of same thickness but of different radii are made of two different materials such that their masses are same. The materials are of densities ρ _{1} and ρ _{2}. The ratio of the moments of inertia of these discs about the respective axes passing through their centers and perpendicular to their planes will be in,
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

