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11 September, 20:54

A man on the moon with a mass of 90 kilograms weighs 146 newtons. The radius of the moon is 1.74 x 106 meters, find the mass of the moon.

a) 7.36 x 10^ (28) kg

b) 2.4 x 10^ (10) kg

c) 7.36 x 10^ (22) kg

d) 1.43 x 10^ (4) kg

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Answers (2)
  1. 11 September, 21:08
    0
    7.36 * 10^22 kg

    Explanation:

    Mass of the man = 90kg

    Weight on the moon = 146N

    radius of the moon = 1.74*10^6

    Weight = mg

    g = weight/mass

    g = 146/90 = 1.62m/s^2

    From the law of gravitational force

    g = GM/r^2

    Where G = 6.67 * 10^-11

    M = gr^2/G

    M = 1.62 * (1.74*10^6) ^2/6.67*10^-11

    = 4.904*10^12/6.67*10^-11

    =0.735*10^23

    M = 7.35*10^22kg. (approximately) with option c
  2. 11 September, 21:23
    0
    Answer: c) 7.36 x 10^ (22) kg

    The mass of the moon is 7.36 x 10^ (22) kg

    Explanation:

    Given;

    mass of the man on the moon, m=90kg

    weight of the man on the moon, W=146 N,

    radius of the moon, r=1.74*10^6 m.

    Weight is the interaction of the mass and the gravity, so

    W=mg.

    g = W/m

    Substituting the given values, we can find the gravity

    g = 146/90 = 1.622m/s2

    The acceleration due to gravity is the strength of moon's gravitational field, so

    g=GM/r^2

    M = gr^2/G ... 2

    where G is gravitational constant.

    G = 6.67 * 10^-11

    Substituting the values into eqn2, we have

    M = 1.622 * (1.74*10^6) ^2/6.67 * 10^-11

    M = 7.362 * 10^22kg

    M = 7.36 * 10^22kg
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