Layers of earth's atmosphere
first place the names of the atmospheric layers in their correct positions, then add the other labels in the appropriate layer.

choices
almost no molecules
exosphere
tropsphere
contains life forms
mesosphere
very low temps
contains ozone layer
stratosphere
where asteroids burn up
contains weather
themosphere
widely varying temps

In what direction does the medium move relative to the direction of the wave? explain.

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?

What is relative velocity? in which condition is relative velocity known by adding the velocity of the first body and that of the second body