(a) how far is the center of mass of the earth-moon system from the center of the earth? (appendix c gives the masses of the earth and the moon and the distance between the two.) m
(b) express the answer to (a) as a fraction of the earth's radius.'

This chart shows characteristics of three different types of waves. which statement is best supported by the information in the chart? wave x and wave y are mechanical waves, and wave z is an electromagnetic wave. wave x and wave y are electromagnetic waves, and wave z is a mechanical wave. wave x and wave z are electromagnetic waves, and wave y is a mechanical wave. wave x and wave z are mechanical waves, and wave y is an electromagnetic wave.