Gravitation (NEET Physics): Questions 40  43 of 84
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Question number: 40
» 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 8 hour respectively. The radius of S _{1} is 10 ^{4 } km. The velocity of S _{2} with respect to S _{1} will be
Choices
Choice (4)  Response  

a. 


b. 


c. 


d. 


Question number: 41
» 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 0.241 year, what is the period of Mars?
Choices
Choice (4)  Response  

a.  3.9 years 

b.  1.9 years 

c.  1.2 years 

d.  3.2 years 

Question number: 42
» Gravitation » Escape Velocity
Question
and denotes the escape velocity from the earth and another planet having twice the radius and the same mean density as the earth. Then which of the following is (are) wrong?
(1)
(2)
(3)
(4)
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 4 are correct 

c.  1 and 3 are correct 

d.  1 and 2 are correct 

Question number: 43
» 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 
