Question

chapter - gravitation class 11


Explain the term satellite and it's Types


Explain all other sub terms

• Orbital Speed

• time period

• Total energy

• Binding energy

+ Their expressions .


No Spam please !!

Answer 1

$<h3>SATELLITE </h3>$

A satellite is a body which continuously revolves on its own around a much larger body in a stable orbit.

$<h3>TYPES OF SATELLITES </h3>$

There are 2 types of satellites :

1. $<h4>NATURAL SATELLITE </h4>$

A satellite created by nature is called a natural satellite. $\bf{Moon}$ is a natural satellite of the earth which, in turn, is a satellite of the sun.

2.$<h4>ARTIFICIAL SATELLITE </h4>$

A man made satellite is called an artificial satellite. $\bf{Russians}$ were the first to put am artificial satellite, SPUTNIK - 1, in an orbit around the earth.

3. $<h4>GEOSTATIONARY SATELLITE </h4>$

A satellite which revolves around the earth in its equatorial plane with the same Angular speed and in the same direction as the earth rotates about its own axis is called a geostationary satellite.

4. $<h4>POLAR SATELLITE </h4>$

A satellite that revolves in a polar orbit is called a polar satellite.

Example - European SPOT and the Indian Earth resources satellites ( IERS ).

________________________________

•$<h3>ORBITAL SPEED </h3>$

Orbital speed or orbital velocity is the velocity required to put the satellite into it's orbit around the earth.

Expression for orbital velocity :

$<h4>v₀ = R √ g / ( R + h )</h4>$

• $<h3>TIME PERIOD </h3>$

It is the time taken by a satellite to complete one revolution around the earth. It is given by...

$<h4>T = 2 π / R √( R + h )³ / g </h4>$

Or T = √ { 3π ( R + h)³ / GρR³

• $<h3>TOTAL ENERGY </h3>$

For a satellite of mass m moving with a velocity v₀ in an orbit of radius r,

Potential Energy, U = - GMm /r

Kinetic energy, K = ½ mv₀² = ½ m ( GM / r )

Total energy, E = K + U = ½ mv₀² - GMm /r

$<h4>E = - GMm / 2r </h4>$

$<h4>E = - K = U /2 </h4>$

• $<h3>BINDING ENERGY </h3>$

The energy required by a satellite to leave its orbit around the earth and escape to infinity is called its binding energy.

The total energy of a satellite is ( - GMm/r ) . In order to escape to infinity, it must be supplied an extra energy to ( + GMm /r ) so that its total energy E becomes equal to zero.

Hence, Binding Energy of a satellite = $<h4>GMm / 2r </h4>$

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Answer 2

Explanation:

SATELLITE

A satellite is a body which continuously revolves on its own around a much larger body in a stable orbit.

TYPES OF SATELLITES

There are 2 types of satellites :

1.NATURAL SATELLITE

A satellite created by nature is called a natural satellite.

is a natural satellite of the earth which, in turn, is a satellite of the sun.

2.ARTIFICIAL SATELLITE

A man made satellite is called an artificial satellite.

were the first to put am artificial satellite, SPTNIK - 1, in an orbit around the earth.

3.GEOSTATIONARY SATELLITE

A satellite which revolves around the earth in its equatorial plane with the same Angular speed and in the same direction as the earth rotates about its own axis is called a geostationary satellite.

4.POLAR SATELLITE

A satellite that revolves in a polar orbit is called a polar satellite.

Example - European SPOT and the Indian Earth resources satellites ( IERS ).

5.ORBITAL SPEED

Orbital speed or orbital velocity is the velocity required to put the satellite into it's orbit around the earth.