What is the period of a wave generated by an earthquake, if it has a wavelength of 500 meters and a speed of 5,000 meters per second?

Ineed with these last two questions: 1) what are two types of cold air masses that influence the weather in north america? name them and describe their humidity. 2) describe the motion of a cold air mass and a warm air mass and the weather you would expect at a warm front and an occluded front.

In what direction does the medium move relative to the direction of the wave? explain.

Atrain departs from its station at a constant acceleration of 5 m/s. what is the speed of the train at the end of 20s?