Which statement most describes how the amplitude and energy of a sound wave
are affected as the wave travels through air and as the wave travels through a
brick wall?
The sound wave has less energy and a larger amplitude when traveling through a
brick wall than when traveling through air.
The sound wave has more energy and a smaller amplitude when traveling
through a brick wall than when traveling through air.
The sound wave has more energy and a larger amplitude when traveling through
a brick wall than when traveling through air.
The sound wave has less energy and a smaller amplitude when traveling through
a brick wall than when traveling through air.

In a wind tunnel the speed changes as the cross sectional area of the tunnel changes. if the speed in a 6' x 6' square test section is 100 mph, what was the speed upstream of the test section where the tunnel measured 20' x 20'? use conservation of mass and assume incompressible flow. conservation of mass requires that as the flow moves through a path or a duct the product of the density, velocity and cross sectional area must remain constant; i.e., that ova-constant. a model is being tested in a wind tunnel at a speed of 100 mph if the flow in the test section is at sea level standard conditions, what is the pressure at the model's stagnation point? (a) the tunnel speed is being measured by a pitot-static tube connected to a u- tube manometer. what is the reading on that manometer in inches of water? (b) at one point on the model a pressure of 2058 psf is measured. what is the local airspeed at that point?

Awave travels at a speed of 5.2 m/s. if the distance between crests is 0.40 m, what is the frequency of the wave? use f=v/wavelength a. 13 hz b. 2.1 hz c. 0.077 hz d. 5.6 hz

Which branches of natural science include the study of an organism that lived 10 million years ago