A radar signal is reflected from the moon. It is detected after a 2.58 s time lapse between sending and
receiving. How far away in kilometers is the moon?

When the magnetic domains in a material can be aligned, but eventually drift out of alignment, the material is

At a certain instant after jumping from the airplane a, a skydiver b is in the position shown and has reached a terminal (constant) speed vb = 52 m/s. the airplane has the same constant speed va = 52 m/s, and after a period of level flight is just beginning to follow the circular path shown of radius ρa = 2330 m. (a) determine the velocity and acceleration of the airplane relative to the skydiver. (b) determine the time rate of change of the speed vr of the airplane and the radius of curvature ρr of its path, both as observed by the nonrotating skydiver.

If a star is moving toward earth, it is