For a satellite moving in an orbit around the earth, the ratio of kinetic energy to potential energy is
Options
(a) (1/2) (b) 1/√2 (c) 2 (d) √2
Correct Answer:
(1/2)
Explanation:
-GMm/R² […]
A body of weight W newton is at the surface of the earth. Its weight at a height equal to half the radius of the earth will be
Options
(a) W/2 (b) 2W/3 […]
If radius of earth’s orbit is made 1/4, the duration of a year will become
Options
(a) 4 times (b) 8 times (c) 1/4 times (d) 1/8 times
Correct Answer:
1/8 times
Explanation: […]
A particle falls towards earth from infinity. Its velocity on reaching the earth would be
Options
(a) infinity (b) √(2gR) (c) 2 √(Rg) (d) zero
Correct Answer:
√(2gR)
Explanation:
No explanation available. Be […]
The radius of orbit of a planet is two times that of the earth. The time period of planet is
Options
(a) 4.2 year (b) 2.8 year (c) 5.6 year (d) 8.4 year
The distance of a geo-stationary satellite from the centre of the earth is nearest to(where R=6400 km)
Options
(a) 5 R (b) 7 R (c) 10 R (d) 18 R
Correct Answer:
7 […]
The angular speed of earth, so that the object on equator may appear weightless is(g = 10 m/s², radius of earth=6400 km)
Options
(a) 1.25 x 10⁻³ rad/s (b) 1.56 x 10⁻³ rad/s […]
At what distance from the centre of earth, the value of acceleration due to gravity will be half that on the surface (R=radius of earth)
Options
(a) 2 R (b) R (c) 1.414 […]
The escape velocity from the earth is Ve. The escape velocity from a planet whose radius is 4 times and density is 9 times that of earth is
Options
(a) 36 Ve (b) […]
A body of mass m is placed on the earth’s surface. It is taken from the earth’s surface to a height h=3R. The change in gravitational potential energy of the body is
Options
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