Gravitation (NEET Physics): Questions 23  26 of 82
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Question number: 23
» Gravitation » GeoStationary Satellites
Question
The moon revolves round the earth 13 times in one year. If the ratio of sunearth distance to earthmoon distance is 393, then the ratio of masses of sun and earth will be –
Choices
Choice (4)  Response  

a.  356 

b.  365 

c.  1 

d.  3.56 ⨯ 10 ^{5} 

Question number: 24
» Gravitation » Orbital Velocity of a Satellite
Question
A satellite is revolving in an orbit close to the earth’s surface. Taking the radius of the earth as 6.4 ⨯ 10 ^{6} meter, the value of the orbital speed and the period of revolution of the satellite will respectively be (g = 9.8 meter/sec ^{2})
Choices
Choice (4)  Response  

a.  7.2 km/sec, 8.6 minutes 

b.  7.2 km/sec, 84.6 minutes 

c.  0.72 km/sec, 84.6 minutes 

d.  2.7 km/sec, 8.6 minutes 

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. 

