1.

In an experiment on standing waves, a string 77 cm long is attached to the prong of an electrically driven tuning fork that oscillates perpendicular to the length of the string at a frequency of 60 Hz. The mass of the string is 0.028 kg. What tension must the string be under (weights are attached to the other end) if it is to oscillate in four loops? Number i UnitsA man strikes one end of a thin rod with a hammer. The speed of sound in the rod is 16 times the speed of sound in air. A woman, at the other end with her ear close to the rod, hears the sound of the blow twice with a 0.19 s interval between; one sound comes through the rod and the other comes through the air alongside the rod. If the speed of sound in air is 343 m/s, what is the length of the rod? Number i UnitsOrgan pipe A, with both ends open, has a fundamental frequency of 370 Hz. The third harmonic of organ pipe B, with one end open, has the same frequency as the second harmonic of pipe A. How long are (a) pipe A and (b) pipe B? (Take the speed of sound to be 343 m/s.) (a) Number Units (b) Number i UnitsA tube 1.20 m long is closed at one end. A stretched wire is placed near the open end. The wire is 0.327 m long and has a mass of 9.60 g. It is fixed at both ends and oscillates in its fundamental mode. By resonance, it sets the air column in the tube into oscillation at that column's fundamental frequency. Assume that the speed of sound in air is 343 m/s, find (a) that frequency and (b) the tension in the wire. (a) Number i Units (b) Number UnitsAn ambulance with a siren emitting a whine at 1500 Hz overtakes and passes a cyclist pedaling a bike at 2.55 m/s. After being passed the cyclist hears a frequency of 1490 Hz. How fast is the ambulance moving? (Take the speed of sound in air to be 343 m/s.) Number Units