Physics Exercises/Gravity

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  1. If ve and vo denotes the escape velocity and orbital velocity of a satellite corresponding to a circular orbit of radius R, then
    1. v_e=v_o
    2. v_e=1.74 \times v_o
    3. v_e=v_o/1.74
    4. v_e and v_o are not related
  2. the orbital traced by planet around a star is in general
    1. a circle
    2. an ellipse
    3. a parabola
    4. a straight line
  3. 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
    1. 4T
    2. T/8
    3. T/4
    4. 8T
  4. A satellite is moving around the earth in a circular orbit.Which of the following statement is correct
    1. it is moving with a constant speed
    2. it is falling freely towards earth
    3. its velocity keeps on increasing
    4. it is falling freely towards the earth its velocity keeps on increasing
  5. a satellite is revolving round the earth in a circular orbit of radius R. work done by gravitational force in one revolution is
    1. zero
    2. 2mgR^2
    3. mgR^2
    4. mgR