Rotational MotionAngular Momentum (NEET Physics): Questions 16  20 of 29
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Question number: 16
» Rotational Motion » Angular Momentum
Question
If the earth is a point mass of 6 x l0 ^{24 } kg revolving around the sun at a distance of 1.5xl0 ^{8} km and in time T = 3.14 xl0 ^{7} s. Then the angular momentum of the earth around the sun is
Choices
Choice (4)  Response  

a.  1.8 x 10 ^{29} kg m ^{2} /s  
b.  2.7 x 10 ^{40} kg m ^{2} /s  
c.  1.5 x 10 ^{37} kg m ^{2} /s  
d.  1.2 x 10 ^{18} kg m ^{2} /s 
Question number: 17
» 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. 

Question number: 18
» 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 
Question number: 19
» 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 
Question number: 20
» Rotational Motion » Angular Momentum
Question
Two rigid bodies A and B rotate with rotational kinetic energies E _{A} and E _{B} respectively. The moments of inertia of A and B about the axis of rotation are I _{A} and I _{B} respectively. If I _{A} = I _{B} /8 and E _{A} = 50 E _{B}, the ratio of angular momentum (L _{A}) of A to the angular momentum (L _{B}) of B is
Choices
Choice (4)  Response  

a.  0. . 25  
b.  2.5  
c.  1.25  
d.  5 