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Thread: is this corect?

  1. #1

    Default is this corect?

    As a meteor moves from a distance of 16 earth radii to a distance of 2 eath radii from the center of earth, the magnitude of the gravitational force between the meteor and earth becomes

    1) 1/8 as great
    2) 8 times as great
    3) 64 times as great
    4) 4 times as great

    is choice 4 correct?

  2. #2
    Never does his homework Fsunka's Avatar
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    Quote Originally Posted by dragon1850 View Post
    As a meteor moves from a distance of 16 earth radii to a distance of 2 eath radii from the center of earth, the magnitude of the gravitational force between the meteor and earth becomes

    1) 1/8 as great
    2) 8 times as great
    3) 64 times as great
    4) 4 times as great

    is choice 4 correct?
    Universal Law of Gravitation.

    The force of attraction is found by multiplying the masses of the two objects and then multiplying by the universal gravitation constant and dividing by the distance between them squared.

    Or in symbols - (Gm1m2)/(r^2)

    All that is changing is the distance between them (r) so let's ignore the top part of the formula.

    At 16 radii we have (Gm1m2)/(16^2) and at 2 radii we have (Gm1m2)/(2^2)

    So it is (Gm1m2)/(256) and (Gm1m2)/(4)

    256/4 = 64.

  3. #3

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    It is easier to roll a stone up a sloping road than to lift it vertical upwards because
    A. work done in rolling is more than in lifting
    B. work done in lifting the stone is equal to rolling it
    C. work done in both is same but the rate of doing work is less in rolling
    D. work done in rolling a stone is less than in lifting it
    Last edited by Terri M. Ingram; 03-20-2015 at 02:14 AM.

  4. #4
    The New Kid
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    For physics homework help, check out Bartleby.

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