You are driving on the highway at 40 m/s with another car driving to you at exactly the same speed. when you honk your horn (with a frequency of 315 Hz), what frequency of the sound will the driver of other car perceive. A. 475 hz
B. 235 Hz
C. 315 Hz
D. 7.8 Hz

Air initially at 0.75 bar, 1000 k, and occupying a volume of 0.12 m^3 undergoes two processes. process 1-2: the air is compressed isothermally until the volume is halved. process 2-3: the air undergoes a constant pressure process until the volume is halved again. assume ideal gas behavior. a) determine the mass of the air, in kg. b) the work and the heat transfer for each of the two processes, in kj. (100 kj = 1 bar . m^3)

Who was the first scientist to measure speed as distance over time?

Aperson walks first at a constant speed of 4.89 m/s along a straight line from point a to point b and then back along the line from b to a at a constant speed of 2.95 m/s. what is the average speed over the entire trip?