Two train whistles, and , each have a frequency of 392 hz. is stationary and is moving toward the right (away from ) at a speed of 35.0 m/s. a listener is between the two whistles and is moving toward the right with a speed of 15.0 m/s no wind is blowing. (a) what is the frequency from as heard by the listener? (b) what is the frequency from as heard by the listener? (c) what is the beat frequency detected by the listener?

Askydiver weighing 140 lb (including equipment) falls vertically downward from an altitude of 19,000 ft and opens the parachute after 18 s of free fall. assume that the force of air resistance, which is directed opposite to the velocity, is of magnitude 0.55|v| when the parachute is closed and is of magnitude 14|v| when the parachute is open, where the velocity v is measured in ft/s. assume that acceleration due to gravity has magnitude 32 ft/s/s; remember that weight is the product of mass and gravitational acceleration. (a) find the speed of the skydiver when the parachute opens. (b) find the distance fallen before the parachute opens. (c) what is the limiting velocity vl after the parachute opens? (d) determine how long the sky diver is in the air after the parachute opens. (e) plot the graph of velocity versus time from the beginning of the fall until the skydiver reaches the ground.

Which situation will produce the greatest change of momentum

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