A wave's speed changes when it goes through a different medium, or type of matter. Our atmosphere is one type of medium, and is crucial to helping sunlight sustain life on Earth. Explain how the atmosphere does this, and what life on Earth might be like if we didn't have an atmosphere.

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Awave is produced in a rope. the wave has a speed of 33 m/s and a frequency of 22 hz.

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.