HELP In one to two sentences, describe the relationship between harmonics and resonan frequency in a piano.

When many atoms are split in a chain reaction, a large explosion occurs. this is an example of what type of energy conservation

What is the coefficient of kinetic friction μk between the block and the tabletop?

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.