Gravitation (NEET (National Eligibility cum Medical Entrance Test) Physics): Questions 32  35 of 84
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Question number: 32
» Gravitation » Escape Velocity
Question
Acceleration due to gravity on a planet is 10 times the value on the earth. Escape velocity for the planet and the earth are V _{p} and V _{e} respectively. Assuming that the radii of the planet and the earth are the same, then –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 33
» Gravitation » Kepler's Laws of Planetary Motion
Question
The mass and radius of earth and moon are M _{1}, R _{1} and M _{2}, R _{2} respectively. Their centers are d distance apart. With what velocity should a particle of mass m be projected from the midpoint of their centers so that it may escape out to infinity–
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 34
» Gravitation » Universal Law of Gravitation
Question
If the period of revolution of an artificial satellite just above the earth be T second and the density of earth be ρ, kg/m ^{3 } then
(G = 6.67 ⨯ 10 ^{11} m ^{3} /kg. second ^{2})
Choices
Choice (4)  Response  

a. 


b.  ρT ^{2} varies with time 

c.  ρT ^{2} is a universal constant 

d.  Both a. and c. are correct 

Question number: 35
» Gravitation » Orbital Velocity of a Satellite
Question
Two satellites S _{1} and S _{2} revolve round a planet in the same direction in circular orbits. Their periods of revolutions are 1 hour and 6 hour respectively. The radius of S _{1} is 1.5 ⨯ 10 ^{5 } km and the radius of S _{2} is 4.95 ⨯ 10 ^{5} km. The velocity of S _{2} with respect to S _{1} is . The angular velocity of S _{2} as actually observed by an astronaut in S _{1} is –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 

