The periodic time of a communication satellite is ......... $hours$.

What are the orbital period of the Moon around the Earth and the rotational period of the Moon about its own axis?

If a satellite is orbiting the earth very close to its surface,then the orbital velocity mainly depends on

$A$ small satellite is revolving near the Earth's surface. Its orbital velocity will be nearly......... $km/sec$.

If the mass of a satellite is doubled and the time period remains constant,the ratio of the orbital radii in the two cases will be:

$A$ geostationary satellite is orbiting the earth at a height $5R$ above the surface of the earth,where $R$ is the radius of the earth. What is the time period (in hours) of another satellite orbiting at a height of $2R$ from the surface of the earth?