The layers in the rock in the picture are curved downward. what is the most likely explanation for this feature? a. pressure in the earth's crust has folded the rock layers which used to be level. b. a fault line shifted horizontally, moving the rock layers. c. a heavy object pushed down the rock layers which used to be level. d. the layer of rock was made curved and was never level.

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.