If, at a given distance from a straight, two-lane road of infinite extent, zero grade, and negligible truck traffic, the maximum equivalent sound level is to remain constant, find the ratio of the maximum vehicle flow rate (Q) if the maximum speed is reduced from 104 km/h (65 mph) to 88 km/h (55 mph).

The sound power level of a certain jet plane flying at a height of 1,5 km is 110dB. Find the maximum sound pressure level on the ground directly below the flight path assuming that the aircraft radiates sound equally in all directions.

2) Water enters a two-dimensional, square channel of constant width, h = 10 cm, with uniform velocity U = 5 m/s. The channel makes a 90° bend that distorts the flow to produce the linear velocity profile shown at the exit, with Vmax Vmin. If the gage pressure at the entrance is P₁G = 100 kPa and the flow at the exit discharges to atmosphere, determine the direction and magnitude of the force of the water acting on the channel. 3 V. V J U ET Vmax Vm min

A 256 Hz sound wave in air (density 1.20 kg/m^3, speed of sound 344 m/s) has intensity 4.50×10^−8 W/m. What is the wave's pressure amplitude? If the intensity remains the same but the frequency is doubled to 512 Hz, how does this affect the pressure amplitude?