# Physics Exercises/Gravity

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- If ve and vo denotes the escape velocity and orbital velocity of a satellite corresponding to a circular orbit of radius R, then
- and are not related

- the orbital traced by planet around a star is in general
- a circle
- an ellipse
- a parabola
- a straight line

- the period of a satellite in a circular orbit of radius R is T.What is the period of another satellite in a circular orbit of radius 4R
- 4T
- T/8
- T/4
- 8T

- A satellite is moving around the earth in a circular orbit.Which of the following statement is correct
- it is moving with a constant speed
- it is falling freely towards earth
- its velocity keeps on increasing
- it is falling freely towards the earth its velocity keeps on increasing

- a satellite is revolving round the earth in a circular orbit of radius R. work done by gravitational force in one revolution is
- zero

- What is the pressure in the center of the Earth assuming the constant density.