Which of the following describes the formation of air convection currents?

a. molecules in cooler air move faster and farther apart than those in warmer air.
b. cooler air moves in over the warm air and pushes it down.
c. the sun warms the land, which heats the air above it.
d. all of the above

What is the mass of the same rock on the earth

Which is an example of an exothermic process?

A200-n force is applied to the foot-operated air pump. the return spring s exerts a 2.6-n·m moment on member oba for this position. determine the corresponding compression force c in the cylinder bd. if the diameter of the piston in the cylinder is 40 mm, estimate the air pressure generated for these conditions. state any assumptions. enter a positive number for the compression force c.