1.
The acceleration to gravity at a height 1/20th of the radius of the earth above the earth surface is . Its value at a point at an equal distance below the surface of the earth in is about below the surface of the earth in is about
2.
Two satellite and go round a planet orbits having radii and respectivly. If the speed of satellite then speed of satellite is
3.
An asteroid of mass is approaching earth, initially at a distance of with speed . It hits the earth with a speed ( are radius and mass of earth), then
4.
The distance of a geo-stationary satellite from the centre the earth (Radius is nearest to
5.
A satellite moves in elliptical orbit about a planet. The maximum and minimum velocities of satellites are and respectively. What is the minimum distance of satellite from planet, if maximum distance is