# them. (b) At what po9ition (othhethan infinitely remote ones) can the 50.0-kg object beplaced so as to experience a net force of zero?38. Use the data of Table 7.3 to find the point betweenEarth and the Sun at which an object can be placed sothat the net gravitational force exerted by Earth andthe Sun on that object is zero.39. A projectile is fired straight upward from the Earth'ssurface at the South Pole with an initial speed equalto one third the escape speed. (a) Ignoring air resis-tance, determine how far from the center of the Earththe projectile travels before stopping momentarily(b) What is the altitude of the projectile at this instant?40. Two objects attract each other with a gravitationalforce of magnitude 1.00 X 10 N when separated by20.0 cm. If the total mass of the objects is 5.00 kg, whatis the mass of each?

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