Satellites

What are the uses of polar satellite ?

Geostationary satellites are widely used for:

Velocity of escape, from earth’s surface, is _____  $\mathrm{km} {\mathrm{s}}^{-1}$.

Calculate the escape velocity of a body from the surface of the earth. $(\mathrm{Given}: G=6.67 \mathrm{x} {10}^{-11} {\mathrm{Nm}}^2/{\mathrm{kg}}^2, R=6400 \mathrm{km}, g=9.8 \mathrm{m}/{\mathrm{s}}^2)$

The radii of orbits of two satellites revolving around the earth are in the ratio $3:8$. Compare their (i) critical speeds (ii) period of revolution.

The distances of two planets from the sun are ${10}^{13} \mathrm{m} \mathrm{and} {10}^{12} \mathrm{m}$ respectively. Find the ratio of time periods and orbital speeds of the two planets.

Calculate the height of the communication satellite. $(\mathrm{Given}: G = 6.67\times {10}^{-11} {\mathrm{Nm}}^2/{\mathrm{Kg}}^2 , M = 6\times {10}^{24} \mathrm{kg}, R = 6400 \mathrm{km})$

What is geo-stationary satellite? State uses of satellites.

Define escape velocity. Write an expression for the escape velocity of an object from the surface of the earth.

Define binding energy and obtain an expression for binding energy of a satellite revolving in a circular orbit around the earth.

Define critical velocity of a satellite and write an expression for it.

If any object is thrown upwards with a velocity more than $11.2 \mathrm{km}/\sec$, then the object will:

Velocity of escape is _____ times the orbital velocity of a satellite revolving very close to the surface of earth. 
(Choose from $\sqrt{3} (1.732)$ or $\sqrt{2} (1.414)$.)

Satellite is an object which revolves around the _____.

A satellite is orbiting around the earth in a circular orbit of radius $r$. Its

The period of moon's rotation around the earth is nearly $29$ days. If moon's mass were $2$ fold its present value, and all other things remain unchanged, the period of moon's rotation would be nearly

Speed of a satellite is $V$ in its circular orbit. What is the kinetic energy of mass $m,$ which is ejected from satellite so that it escape from gravitational field of Earth.

Polar satellites

A period of geostationary satellite is

A satellite revolving around a planet has orbital velocity $10 \mathrm{km} {\mathrm{s}}^{-1}$. The additional velocity required for the satellite to escape from the gravitational field of the planet is