In the arrangement shown in the figure below, an object of mass m = 6.0 kg hangs

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)

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