(1) My textbook says, "Air molecules don’t get push forward forever because that’s called wind." So, what type of force stops the air molecules from moving forward forever?

A school is setting up for the science department's annual "Night of Phantastic Physics Phun." One of the most popular demonstrations is the traveling wave pulse, in which participants pluck one end of a long, taut wire to send transverse wave pulses racing across the room. The goal is for the pulses to travel across the 19.5 m wire in a time of about 0.500 s. The mass of a 1 m long piece of the wire is known to be 0.435 kg. What should the tension in the wire be in order to achieve the desired wave speed? tension:

A periodic vibration at x = 0, t = 0 displaces air molecules along the x direction by smax = 3.2E-05 m. The motion produces a sound wave that travels at a velocity of v = 336 m/s with a frequency of f = 120 Hz. Take the density of air as ρa = 1.20 kg/m3. Calculate the displacement of the air molecules using an function for the traveling sound wave in terms of time and position at time t = 0.001 s and displacement x = 1.0 m.  Write an expression for the maximum pressure exerted by the sound wave ΔPmax in terms of the air density ρa, the sound velocity v, the angular frequency ω, and the maximum displacement smax. The sound wave is directly incident on a sheet of paper of surface area A = 0.013 m2. Calculate the maximum force Fmax, in newtons, exerted on this sheet.

Consider two tight strings, String A and String B. A wave travels on String A with a speed four times greater than the speed of a wave on String B. String A has twice the tension as String B. HA Which of the following is the ratio of densities of the strings: Ratio = HB 8 2 1 1/2 1/8