them. (b) At what po9ition (othhe than infinitely remote ones) can the 50.0-kg object be placed so as to experience a net force of zero? 38. Use the data of Table 7.3 to find the point between Earth and the Sun at which an object can be placed so that the net gravitational force exerted by Earth and the Sun on that object is zero. 39. A projectile is fired straight upward from the Earth's surface at the South Pole with an initial speed equal to one third the escape speed. (a) Ignoring air resis- tance, determine how far from the center of the Earth the projectile travels before stopping momentarily (b) What is the altitude of the projectile at this instant? 40. Two objects attract each other with a gravitational force of magnitude 1.00 X 10 N when separated by 20.0 cm. If the total mass of the objects is 5.00 kg, what is the mass of each?

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