Which of the following statements is true? a. the angle of refracted light is equal and opposite to the angle of incoming light. b. a magnetic field can be created by running an electric current through a magnet. c. exothermic chemical reactions absorb heat. d. velocity and temperature are scalar quantities.

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.