In the arrangement shown in the figure below, an object of mass m = 6.0 kg hangs from a cord around a light pulley. The length of the cord between...

In the arrangement shown in the figure below, an object of mass m = 6.0 kg hangs from a cord around a light pulley. The length of the cord between point P and the pulley is L = 2.0 m. (Ignore the mass of the vertical section of the cord.)

http://www.webassign.net/sercp9/14-p-046.gif

(a) When the vibrator is set to a frequency of 120 Hz, a standing wave with six loops is formed. What must be the linear mass density of the cord?

___________ kg/m

(b) How many loops (if any) will result if m is changed to 14 kg? (Answer is not 21.61)