A0.800-m-long string with linear mass density m = 7.50 g> m is stretched between two supports. the string has tension f and a standing-wave pattern (not the fundamental) of frequency 624 hz. with the same tension, the next higher standing-wave frequency is 780 hz.
(a) what are the frequency and wavelenght of the fundamental standing wave for this string?
(b) what is the value of f?

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.