One end of a horizontal string is attached to a small-amplitude mechanical 57 Hz vibrator. The string's mass per unit length is 4.4 10-4 kg/m. The string passes over a pulley, a distance L = 1.50 m away, and weights are hung from this end Assume the string at the vibrator is a node, which is nearly true. What mass m must be hung from this end of the string to produce a standing wave with the following number of loops? (a)one loop-----kg? (b) two loops----------kg? (c) five loops -------------kg?