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In the arrangement shown in the gure below, an object of mass m = 4.0 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.) Vibrator F L~ l K\" b p ._J l 1% p. \\, (a) When the vibrator is set to a frequency of 160 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 9.00 kg? (Enter 0 if no loops form.) loops (c) How many loops (if any) will result if m is changed to 10 kg? (Enter 0 if no loops form.) loops