Physics Crash Course NDA & NA EE>Chapter 9 - Gravitation>Exercise 1>Q 28

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If a projectile has a velocity greater than the escape velocity, which trajectory will it follow?

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Important Questions on Gravitation

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Physics Crash Course NDA & NA EE>Chapter 9 - Gravitation>Exercise 1>Q 29

Acceleration due to gravity on a planet is

10

times the value on the Earth. Escape velocity for the planet and the Earth are

v_{P}

and

v_{e}

, respectively. Assuming that the radii of the planet and the Earth are same, then

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Physics Crash Course NDA & NA EE>Chapter 9 - Gravitation>Exercise 1>Q 30

The escape velocity of a body on an imaginary planet which is thrice the radius of the earth and double the mass of the earth is (

v_{e}

is the escape velocity of earth)

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Physics Crash Course NDA & NA EE>Chapter 9 - Gravitation>Exercise 1>Q 31

A body is projected vertically upwards from earth's surface with velocity

2 v_{e},

where

v_{e}

is escape velocity from earth's surface. The velocity when body escapes the gravitational pull is

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Physics Crash Course NDA & NA EE>Chapter 9 - Gravitation>Exercise 1>Q 32

The relay satellite transmits the

T . V .

programme continuously from one part of the world to another because its

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Physics Crash Course NDA & NA EE>Chapter 9 - Gravitation>Exercise 1>Q 33

A geostationary satellite

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Physics Crash Course NDA & NA EE>Chapter 9 - Gravitation>Exercise 1>Q 34

A rocket is fired with a speed

u = 3 \sqrt{g R}

from the earth surface. What will be its speed at interstellar space?

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Physics Crash Course NDA & NA EE>Chapter 9 - Gravitation>Exercise 1>Q 35

The orbital velocity of an artificial satellite in a circular orbit just above the earth's surface is

v

. For a satellite orbiting at an altitude of half of the earth's radius, the orbital velocity is

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Physics Crash Course NDA & NA EE>Chapter 9 - Gravitation>Exercise 1>Q 36

An earth satellite of mass

m

revolves in a circular orbit at a height

h

from the surface of the earth.

R

is the radius of the earth and

g

is the acceleration due to gravity at the surface of the earth. The velocity of the satellite in the orbit is given by