Geostationary and Polar Satellites

A satellite revolves in the geostationary orbit but in a direction east to west. The time interval between its successive passing about a point on the equator is 

What are the uses of polar satellite ?

Height of a geostationary orbit is fixed.

What are low height satellites?

Why are polar satellites used in remote sensing?

Geostationary satellites are widely used for:

A geostationary satellite:

As you have learnt in the text, a geostationary satellite orbits the earth at a height of nearly $36,000 \mathrm{km}$ from the surface of the earth. Potential due to earth’s gravity at the site of this satellite is $-9.4\times {10}^n {\mathrm{Jkg}}^{-1}$. Find $n$ (Take the potential energy at infinity to be zero). Mass of the earth$=6.0\times {10}^{24} \mathrm{kg},$ radius$=6400 \mathrm{km}$. 

If a satellite has to orbit the earth in a circular path every $6 \mathrm{h}$, at what distance from the surface of the earth should be satellite placed (radius of earth, $R_{\mathrm{e}}=6400 \mathrm{km}$) (assume, $\frac{GM}{4{\pi }^2}=8.0\times {10}^{12} \mathrm{N} {\mathrm{m}}^{-2} {\mathrm{kg}}^{-1}$, where $G$ and $M$ are gravitational constant and mass of earth and ${10}^{1/3}=2.1$),

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.

Geo-stationary satellite revolves in _____ (equatorial/ polar) orbit of earth.

A synchronous satellite goes around the earth once in every $24\mathrm{ }\mathrm{h}.$ What is the radius of orbit of the synchronous satellite in terms of the earth's radius?
(Given: mass of the earth, ${\mathrm{M}}_{\mathrm{E}}=5.98\times {10}^{24}\mathrm{ }\mathrm{k}\mathrm{g}$ , radius of the earth, ${\mathrm{R}}_{\mathrm{E}}=6.37\times {10}^6\mathrm{ }\mathrm{m}$ and universal gravitational constant, $\mathrm{G}=6.67\times {10}^{-11}\mathrm{N}\mathrm{ }{\mathrm{m}}^2\mathrm{ }\mathrm{k}{\mathrm{g}}^{-2}$)

The minimum number of geostationary satellites required for uninterrupted global coverage is

A period of geostationary satellite is

The mean radius of earth R, its angular speed on its own axis is $\omega$ and the acceleration due to gravity at earth's surface is g. What will be the radius of the orbit of a geostationary satellite?

What is the shortest possible period of a satellite of earth in circular orbit?

The periodic time of a communication satellite is

Which of the following is correct?

A geo-synchronous satellite is