At an auto race, a member of the pit crew stands beside the track. a car approaches him at 100 m/s and emits a sound at frequency 1100hz. the air is still and the speed of sound is 340mls. what frequency will the pit crew member hear? a.1560hz b.1420hz c.1640hz d.850hz

When the velocity of an object is doubled, by what factor is its momentum changed? by what factor is its kinetic energy changed? a) the momentum is zero. b) the momentum is not zero. c) difficult to say.

The difference between a red shift and a blue shift has to do with wavelength frequency. t or f

A250-n box is at rest on a frictionless horizotal floor. then a person shoves the box with a non-zero force of magnitude p. which statement best describes the relationship betweeen p and the motion of the box after it was shoved? -the box will not move when p< 250n but otherwise will accelerate at a constant rate that is directly proportional to p - the box will begin moving at a speed that is directly proportional to p, then will gradually slow to a halt -the box will move with constant velocity at a speed that is directly proportional to p -box will accelerate across the floor at a constant rate that is directly proportional to p