To fully describe the photoelectric effect, scientists must consider which of the following to be quantized?
A. Matter only
B. Neither light nor matter
C. Both light and matter
D. Light only

If forces acting on an object are unbalanced, which factors may result fron an unbalanced force? check all that apply

If steel is more dense that lake water, why can a boat float

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.