Suppose two spheres fashioned of pure Gold are in contact. What must the radius of the spheres be such that the gravitational force among them is exactly 1.00 Newtons of force? Recall that the density of Gold is ρAU = 19, 300 kg/m^3, while the magnitude of the gravita- tional force among the spheres is given by the Universal Law of Gravitation: Fg =G*(M1*M2)/ d2 where d is the distance between the geometric centers of the gold spheres. It may also help to note that the volume of a sphere is (4π /3)*R^3 .  A. 2.28 m B. 1.74 m C. 1.01 m D. 0.58 m

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!