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A black hole is an object whose gravitat...

A black hole is an object whose gravitational field si so strong that even light cannot escape from it. To what approximate radius would earth (mass `= 5.98 xx 10^(24) kg)` have to be compressed to be a black hole ?

A

`10^(-9)m`

B

`10^(-6) m`

C

`10^(-2)m`

D

`100 m`

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The correct Answer is:
C
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ALLEN-GRAVITATION-EXERCISE 2
  1. A planet moving along an elliptical orbit is closest to the sun at a d...

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  2. A spherical planet has a mass M(p) and D(p). A particle of mass m fall...

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  3. A geostationary satellite is orbiting the earth at a height of 5R abov...

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  4. The height at which the weight of a body becomes 1//6 th, its weight o...

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  5. Which one of the following plots represents the variation of gravitati...

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  6. If v(e ) is escape velocity and v(o) is orbital velocity of a satellit...

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  7. A particle is thrown vertically upwards upwards with velocity 11.2" km...

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  8. A black hole is an object whose gravitational field si so strong that ...

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  9. Dependence of intensity of gravitational field (E) of the earth with d...

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  10. Kepler's third law states that square of period of revolution (T) of a...

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  11. A satellite S is moving in an elliptical orbit around the earth. The m...

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  12. A remote-sensing satellite of earth revolves in a circular orbit at a ...

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  13. Find the velocity of a satellite at height 80 km from earth. If the ra...

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  14. At what height from the surface of earth, the gravitation potential an...

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  15. The ratio of escape velocity at earth (V(e)) to the escape velocity at...

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  16. Starting from the centre of the earth having radius R, the variation o...

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  17. A satellite of mass m is orbiting the earth (of radius R) at a height ...

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  18. Find out energy required (in Giga Joule) to escape a space shuttle of ...

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  19. The acceleration due to gravity at a height 1 km above the earth is th...

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  20. Two astronauts are floating in gravitational free space after having l...

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