Gamma Question Bank for Medical Physics>Chapter 8 - Gravitation>Assignment>Q 29

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An artificial satellite revolves around a planet for which gravitational force $(F)$ varies with distance $r$ from its centre as $F \propto r^{2} .$ If $v_{0}$ its orbital speed, then

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Important Questions on Gravitation

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Gamma Question Bank for Medical Physics>Chapter 8 - Gravitation>Assignment>Q 30

If the gravitational potential on the surface of earth is

V_{0},

then potential at a point at height half of the radius of earth is

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Gamma Question Bank for Medical Physics>Chapter 8 - Gravitation>Assignment>Q 31

The total mechanical energy of an object of mass

m

projected from surface of earth with escape speed is

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Gamma Question Bank for Medical Physics>Chapter 8 - Gravitation>Assignment>Q 32

The escape velocity of a body from earth is about

11.2 km s^{- 1} .

Assuming the mass and radius of the earth to be about 81 and 4 times the mass and radius of the moon, the escape velocity in

km s^{- 1} .

from the surface of the moon will be

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Gamma Question Bank for Medical Physics>Chapter 8 - Gravitation>Assignment>Q 33

If

M

is mass of a planet and

R

is its radius then in order to become black hole [

c

is speed of light]

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Gamma Question Bank for Medical Physics>Chapter 8 - Gravitation>Assignment>Q 34

The atmosphere on a planet is possible only if [where

v_{ms}

is root-mean-square speed of gas molecules on planet and

v_{e}

is escape speed on its surface]

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Gamma Question Bank for Medical Physics>Chapter 8 - Gravitation>Assignment>Q 35

When speed of a satellite is increased by

x

percentage, it will escape from its orbit, where the value of

x

is

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Gamma Question Bank for Medical Physics>Chapter 8 - Gravitation>Assignment>Q 36

In an orbit if the time of revolution of a satellite is

T,

then

P E

is proportional to

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Gamma Question Bank for Medical Physics>Chapter 8 - Gravitation>Assignment>Q 37

A small satellite is revolving near earth's surface. Its orbital velocity will be nearly.