Can earth be considered as a point object when it is describing its yearly journey around the sum ?`

Can earth be regarde as a point object when it is describing its yearly journey around the sum ?

When can an object be considered as a point object ? Explain in brief.

When is a moving object considered as a point object ? Give some example.

Mass of an object is 10 kg. what is its weight on earth ?

An object is projected from the earth's surface with escape velocity at 30^(@) with horizontal. What is the angle made by the velocity with horizontal when the object reaches a height 2R from the earth's surface ? R is the radius of the earth. Horizontal can be considered as a line parallel to the tangent at the earth's surface just below the object .

(a) Earth can be thought of as a sphere of radius 64 00 km . Any object (or a person ) is performing circula motion around the axis os earth due to earth s rotation (period 1 day ). What is acceleration o object on the surface of th earth 9at equator ) towards its centre ? What is its latitude theta ? How does these accelerations compare with g=9.8 m//s^2 ? (b) Earth also moves in circular orbit around sum every year withon orbital radius of 1.5 xx 10 ^(11) m . What is the acceleration of earth ( or any object on the surface of the earth ) towards the centre of the sum ? How dies thsi acceleration comparte with g=9.8 ms^2 ?