The gravitational attraction between two spheres is given by the Newton's gravitational law:
where "m_1 = m_2 = 2kg" are masses of two identical spheres, "r = 2\\cdot 30mm = 0.06m" is the distance between their centers and "G = 6.67\\times10^{-11} m^3kg^{-1}s^{-2}" is the gravitational constant. Thus, obtain:
"F = G\\dfrac{m_1m_2}{r^2} = 6.67\\times10^{-11} \\cdot \\dfrac{2\\cdot 2}{0.06^2} \\approx 7.41\\times 10^{-8}N"
Answer. "7.41\\times 10^{-8}N".
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