Acommunication satellite is orbiting at an altitude of 3 earth radii above the ground. what is the speed?

The dot diagram represents the motion of the motorcycle as it moves from left to right

Is the number of complete movements of a wave per second.

The average atmospheric pressure on earth is approximated as a function of altitude by the relation patm = 101.325 (1 − 0.02256z)5.256, where patm is the atmospheric pressure in kpa, and z is the altitude in km with z = 0 at sea level. determine the approximate atmospheric pressures at atlanta (z = 306 m), denver (z = 1610 m), mexico city (z = 2309 m), and the top of mount everest (z = 8848 m).