2 1.1.2 Quiz: Introduction to Waves Question 8 of 10
Which of the following are properties of mechanical waves?

A. The particles of the medium always move parallel to the wave
motion.
B. Waves transport energy from a source outward, away from the
source.
c. Particles of the medium move back and forth, but do not move
with the wave.
D. Wave motion begins with a disturbance in the medium.
SUBMIT

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)

Aball horizontally thrown from a cliff at 8m/s

Engines for propeller-driven aircraft are limited in their maximum rotational speed by the fact that the tip speed of the propeller must not approach the speed of sound in air (mach i). taking 6 ft as a typical diameter for a propeller of a light airplane and 1100 fils as the speed of sound, find the upper limit on the rpm (revolutions per minute) of the propeller shaft.