1). An audio speaker producing a steady sound at an outdoor concert is 28 ft away from you. If you move to a position where the speaker is 64 ft distant, by what factor will the amplitude of the sound change?

A_f

A_i

=

2). Two children stretch a jump rope between them and send wave pulses back and forth on it. The rope is 3.7 m long, its mass is 0.60 kg, and the force exerted on it by the children is 49 N.

(a) What is the linear mass density of the rope (in kg/m)?

(b) What is the speed of the waves on the rope (in m/s)?