Abat at rest sends out ultrasonic sound waves at 50.0 khz and receives them returned from an object moving directly away from it at 27.5 m/s. what is the received sound frequency?

Which of the following is an example of units for speed

Which atomic model was proposed as a result of j. j. thomson’s work?

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.