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25 August, 14:24

Two objects attract each other gravitationally with a force of 2.5 x 10^-10N when they are 0.25 m apart. Their total mass is 4.00 kg. Find their individual masses.

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  1. 25 August, 15:18
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    M = 3.9406 kg and m = 0.0594 kg

    Explanation:

    The gravitational force between two bodies is directly proportional to the product of their masses and inversely proportional to the square of the distance that separates them. Mathematically it is expressed as follows:

    Fg = (G*M*m) / r² Formula (1)

    Where:

    Fg is the gravitational force (N)

    G is the universal gravitation constant, G = 6.67 * 10⁻¹¹ (N*m²) / kg²

    M and m are the masses of the bodies that interact (kg).

    r is the distance that separates them (m).

    Known Data

    Fg = 2.5 * 10⁻¹⁰ N

    r = 0.25 m

    G = 6.67 * 10⁻¹¹ (N*m²) / kg²

    Problem development

    We propose 2 equations

    M + m = 4kg

    M = 4 - m equation (1)

    We replace in formula (1)

    2.5 * 10⁻¹⁰ = (6.67 * 10⁻¹¹ * M * m) / (0.25) ²

    2.5 * 10⁻¹⁰ * (0.25) ² = (6.67 * 10⁻¹¹ * M * m)

    (2.5 * 10⁻¹⁰ * (0.25) ²) / (6.67 * 10⁻¹¹) = M * m

    M * m = 0.234 equation (2)

    We replace M = 4 - m in equation (2)

    (4 - m) * m = 0.234

    4m - m² = 0.234

    m² - 4m + 0.234 = 0 (quadratic equation)

    We apply the formula for the quadratic equation and obtain 2 values for m that meet the conditions:

    m = 3.9406 kg or m = 0.0594 kg

    We replace m in equation (1)

    M = 4 - 3.9406 = 0.0594 kg or M = 4 - 0.0594 = 3.9406

    To meet the condition that M + m must give 4 kg, one mass must be equal 3.9406 and the other must equal 0.0594, then:

    M = 3.9406 kg and m = 0.0594 kg
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