The time period of a simple pendulum on a freely moving artificial satellite is

(1) Zero                           

(2) 2 sec

(3)  3 sec                          

(4)  Infinite

Subtopic:  Satellite |
 74%
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For the moon to cease as the earth's satellite, its orbital velocity has to be increased by a factor of:

1. \(2\) 2. \(\sqrt{2}\)
3. \(1/\sqrt{2}\) 4. \(4\)
Subtopic:  Orbital velocity |
 77%
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The height of a point vertically above the earth’s surface, at which the acceleration due to gravity becomes \(1\%\) of its value at the surface is: (Radius of the earth = \(R\))
1. \(8R\)
2. \(9R\)
3. \(10R\)
4. \(20R\)

Subtopic:  Acceleration due to Gravity |
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The escape velocity of an object from the earth depends upon the mass of the earth (M), its mean density, its radius (R) and the gravitational constant (G). Thus the formula for escape velocity is:

(1) v=R8π3Gp                                         

(2) v=M8π3GR

(3) v=2GMR                                             

(4) v=2GMR2

Subtopic:  Escape velocity |
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Escape velocity on a planet is ve. If radius of the planet remains same and mass becomes 4 times, the escape velocity becomes

(1)4ve                                               

(2)2ve

(3)ve                                                 

(4)12ve

Subtopic:  Escape velocity |
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The mass of the earth is 81 times that of the moon and the radius of the earth is 3.5 times that of the moon. The ratio of the escape velocity on the surface of earth to that on the surface of moon will be

(1)0.2                                                             

(2)2.57

(3)4.81                                                             

(4)0.39

Subtopic:  Escape velocity |
 70%
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If radius of earth is R then the height h’ at which value of ‘g’ becomes one-fourth is 

(1)R4               

(2)3R4

(3)R                 

(4)R8

Subtopic:  Acceleration due to Gravity |
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The escape velocity from the surface of the earth is ve. The escape velocity from the surface of a planet whose mass and radius are 3 times those of the earth will be:

(1) ve                                                             

(2) 3ve

(3) 9ve                                                           

(4) 27ve

Subtopic:  Escape velocity |
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How much energy will be necessary for making a body of 500 kg escape from the earth?
g=9.8 m/s2, radius of earth=6.4×106m

(a) About 9.8×106J                        (b) About 6.4×108J

(c) About 3.1×1010J                      (d) About 27.4×1012J

Subtopic:  Escape velocity |
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Two planets have the same average density but their radii are R1  and R2. If acceleration due to gravity on these planets be g1 and g2 respectively, then

(1)    g1g2R1R2                   

(2) g1g2=R2R1

(3)    g1g2R12R22                  

(4) g1g2R13R23

Subtopic:  Acceleration due to Gravity |
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