Gravitation (NEET (NTA)National Eligibility cum Entrance Test (Medical) Physics): Questions 33  36 of 84
Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 2142 questions. Access all new questions we will add tracking exampattern and syllabus changes. View Sample Explanation or View Features.
Rs. 550.00 or
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. 


Question number: 36
» Gravitation » Universal Law of Gravitation
Question
An artificial satellite of the earth is to be established in the equatorial plane of the earth and to an observer at the equator it is required that the satellite will move eastward, completing one round trip per day. The distance of the satellite from the center of the earth will be (The mass of the earth is 6.00 ⨯ 10 ^{24} kg and its angular velocity = 8.30 ⨯ 10 ^{5} rad/sec)
Choices
Choice (4)  Response  

a.  2.66 ⨯ 10 ^{3} m. 

b.  2.44 ⨯ 10 ^{7} m. 

c.  2.66 ⨯ 10 ^{5} m. 

d.  2.66 ⨯ 10 ^{7} m. 
