Aplanet has two moons with identical mass. moon 1 is in a circular orbit of radius r. moon 2 is in a circular orbit of radius 2r. the magnitude of the gravitational force exerted by the planet on moon 2 is which of the following compared with the gravitational force exerted by the planet on moon 1?
half as largetwice as largeone-fourth as largefour times as largethe same

Wo small variable-thrust jets are actuated to keep the spacecraft angular velocity about the z-axis constant at ? 0 = 1.16 rad/s as the two telescoping booms are extended from r1 = 1.18 m to r2 = 4.69 m at a constant rate over a period of 124 seconds. the small 19-kg experiment modules at the ends of the booms may be treated as particles, and the mass of the rigid booms is negligible. determine the necessary thrust t for each jet as a function of time where t = 0 is the time when the telescoping action is begun. after you have the general expression for t, answer the questions. show work.