Gravitation (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 25  28 of 84
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Question number: 25
» Gravitation » Escape Velocity
Question
Gas escapes from the surface of a planet because it acquires an escape velocity. The escape velocity will depend on which of the following factors:
(1) Mass of the planet
(2) Radius of the planet
(3) Mass of the particle escaping
(4) Temperature of the planet
Select the correct answers with mark it according to the following codes:
Choices
Choice (4)  Response  

a.  1.2 and 3 are correct 

b.  1 and 2 are correct 

c.  1 and 3 are correct 

d.  1 and 4 are correct 

Question number: 26
» Gravitation » Energy
Question
Two satellites P and Q of same mass are revolving near the earth surface in the equatorial plane. The satellite P moves in the direction of rotation of earth whereas Q moves in the opposite direction. The ratio of their kinetic energies with respect to a frame attached to earth will be –
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 27
» Gravitation » Gravitational Potential
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. The velocity of S _{2} with respect to S _{1} will be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 28
» Gravitation » Kepler's Laws of Planetary Motion
Question
The semimajor axes of the orbits of mercury and mars are respectively 0.387 and 1.524 in astronomical unit. If the period of Mercury is 0.222 year, what is the period of Mars?
Choices
Choice (4)  Response  

a.  1.73 years 

b.  1.23 years 

c.  3.24 years 

d.  1.95 years 
