NEET Physics: Questions 1938  1942 of 2142
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Question number: 1938
» Gravitation » Energy
Question
A body of mass 250 kg falls on the earth from infinity. What will be its energy on reaching the earth? Radius of the earth is 6400 km and g = 9.8 m/s ^{2}. Air friction is negligible.
Choices
Choice (4)  Response  

a.  1.56 ⨯ 10 ^{10} J 

b.  2.27 ⨯ 10 ^{10} J 

c.  2.54 ⨯ 10 ^{9} J 

d.  1.27 ⨯ 10 ^{9} J 

Question number: 1939
» Gravitation » Orbital Velocity of a Satellite
Question
The speed with which the earth have to rotate on its axis so that a person on the equator would weigh the as much as present will be  (Take the equatorial radius as 6400 km. )
Choices
Choice (4)  Response  

a.  7.28 ⨯ 10 ^{3} rad/sec 

b.  3 28 ⨯ 10 ^{3} rad/sec 

c.  3 28 ⨯ 10 ^{4} rad/sec 

d.  7.83 ⨯ 10 ^{4} rad/sec 

Question number: 1940
» Rotational Motion » Values of Moments of Inertia
Question
A flywheel rotating about a fixed axis has a kinetic energy of 380 J, when its angular speed is 35 rad s ^{1}. The moment of inertia of the wheel about the axis of rotation is,
Choices
Choice (4)  Response  

a.  0.8 kg m ^{2 } 

b.  0.75 kg m ^{2 } 

c.  0.15 kg m ^{2 } 

d.  0.62 kg m ^{2} 

Question number: 1941
» Rotational Motion » Values of Moments of Inertia
Question
A cylinder of 500 g and radius 10 cm has moment of inertia (about its natural axis)
Choices
Choice (4)  Response  

a.  2.5 ⨯ 10 ^{3} kgm ^{2} 

b.  2 ⨯ 10 ^{3} kgm ^{2} 

c.  3.5 ⨯ 10 ^{3} kgm ^{2} 

d.  5 ⨯ 10 ^{3} kgm ^{2} 

Question number: 1942
» Rotational Motion » Values of Moments of Inertia
Question
Three particles of mass 1.5 kg are attached to the rim of a circular disc of radius 0.2 m & negligible mass. Moment of inertia of die system about an axis passing through the center of the disc & perpendicular to its plane is
Choices
Choice (4)  Response  

a.  2.2 kgm ^{2} 

b.  0.18 kgm ^{2} 

c.  l kgm ^{2} 

d.  0.24 kgm ^{2 } 
