NEET (National Eligibility cum Medical Entrance Test) Physics: Questions 1960  1963 of 2142
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Question number: 1960
» Gravitation » Energy
Question
With what velocity must a body be thrown upward form the surface of the earth so that it reaches a height of 10 R _{e}? Mass of earth M = 6 ⨯ 10 ^{24} kg, radius R _{e} = 6.4 ⨯ 10 ^{6} m and G = 6.67 ⨯ 10 ^{11} Nm ^{2} /kg ^{2}.
Choices
Choice (4)  Response  

a.  10.7 ⨯ 10 ^{3} m/s 

b.  10.7 ⨯ 10 ^{5} m/s 

c.  10.7 ⨯ 10 ^{4 } m/s 

d.  1.07 ⨯ 10 ^{4} m/s 

Question number: 1961
» Gravitation » Energy
Question
The masses and the radius of the earth and the moon are M _{1}, M _{2} and R _{1}, R _{2} respectively their centers are at distance d apart. The minimum speed with which a particle of mass m should be projected form a point midway between the two centers so as to escape to infinity will be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 1962
» Rotational Motion » Moment of Inertia
Question
Two discs of the same material and thickness have radii 0.2 m and 0.6 m. Their moments of inertia about their axes will be in the ratio of,
Choices
Choice (4)  Response  

a.  1: 3 

b.  1: 9 

c.  1: 81 

d.  1: 27 

Question number: 1963
» Rotational Motion » Moment of Inertia
Question
A circular disc of radius R and thickness has moment of inertia I about an axis passing through its center and perpendicular to its plane. It is melted and recanted into a solid sphere. The moment of inertia of the sphere about one of its diameters as an axis of rotation will be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

