According to the law of conservation of energy. a. an object loses most of its energy as friction. b. the total amount of energy for a system stays the same. c. the potential energy of an object is always greater than its kinetic energy. d. the kinetic energy of an object is always greater than its potential energy.

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.