Question

please answer question no 5...​

Answer 1

The time an object takes to rotate in a circular path is dependent on the radius of it’s circular path.

If we calculate the height at which orbital period of the satellite is same as the Earth's rotation period, it comes out to be 35,786 kilometers(22,236 miles).

So, if a satellite is placed directly above the Earth's equator at that height and following the direction of the Earth's rotation, it will appear motionless, at a fixed position in the sky, to ground observers.

So, yes it is possible to put an artificial sattelite in an orbit in such a way that it always visible from Delhi. But As that type of satellite has to be directly over equator, it will not be 90 degrees above chandigarh.

Fancy term for this is geostationary orbit.