Two spaceships are approaching each other. (a) if the speed of each is 0.9c relative to earth, what is the speed of one relative to the other? (b) if the speed of each relative to earth is 30,000 m/s (about 100 times the speed of sound), what is the speed of one relative to the other?

The harmonic motion of a particle is given by f(t) = 2 cos(3t) + 3 sin(2t), 0 ? t ? 8. (a) when is the position function decreasing? (round you

Discuss how the hardness or softness of the landing surface is related to the time required to stop the egg

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.