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Name the scientist who explained the motion of planets on the basis of gravitational force between the sun and planets

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Knowledge Check

  • When a planet is orbiting around the sun in an elliptical orbit, r_(1) and r_(2) denote its closest and farthest distances from the sun. Then the ratio of the magnitudes of maximum and minimum gravitational forces between them is

    A
    `r_(1):r_(2)`
    B
    `r_(1)^(2):r_(2)^(2)`
    C
    `r_(2):r_(1)`
    D
    `r_(2)^(2):r_(1)^(2)`

  • During motion of a planet from perihelion to aphelion the work done by gravitational force of sun on it is

    A
    Zero
    B
    Negative
    C
    Positive
    D
    May be positive or negative

  • When a satellite is on the surface of a planet, it experiences a gravitational force W. What is the gravitational force when the satellite is at height R/50, where R is the radius of the planet?

    A
    1.02 W
    B
    1.00 W
    C
    0.92 W
    D
    0.96 W

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