Dax just completed a report on car transportation. He concluded that gasoline prices will likely rise significantly in the years to come and recommends lower-cost car transportation for the future.

Dax's younger sister, Ava, just completed a report on air pollution. Ava concluded that gasoline-powered cars cause too much pollution and recommends that they should not be used in the future.

Which of the following is a solution for the future that would follow both Dax's and Ava's recommendations?
A.
enactment of laws requiring all people to ride bicycles instead of driving cars

B.
development of gasoline-powered cars that have better fuel efficiency

C.
development of cars that run on fuels that pollute less and cost less than gasoline

D.
enactment of laws that require gasoline to cost more and cause more pollution

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?

Ascrew incorporates which other simple machine? lever wheel and axle inclined plane pulley

Determine the fraction of the magnitude of kinetic energy lost by a neutron (m1 = 1.01 u) when it collides head-on and elastically with a target particle at rest which is 21h (heavy hydrogen, m = 2.01 u).