An airliner lands with a speed of 47.0 m/s. each wheel of the
plane has a radius of1.25 m and a moment of inertia of
110kgm2.
attouchdown the wheels begin to spin under the action of
friction. each wheel supports a weight of 1.40 104
n, and the wheels attain their angular speed in 0.47 s while rolling
without slipping. what is thecoefficient of kinetic friction
between the wheels and the runway? assume that the speed of the
plane is constant.

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?

Which of the following harmful chemicals are found in tobacco smoke? a. carbon monoxide b. carbon dioxide c. nicotine b. carbon dioxide d. both a and c

True or false graphs must include scales that increase by the same amount