Which of the following statements is
true of sound transmission through various
mediums?
a. sound insulators prevent sound from
being transmitted better than elastic solids.
b. inelastic materials conduct sound
better than elastic solids.
c. elastic solids prevent sound from
being transmitted better than liquids.
d. gases conduct sound better than
liquids.

What are the theoretical properties of a gas at a temperature of 0 kelvin?

An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 137 ft at an angle of 34.0° above the horizontal. it then moves 137 ft at an angle of 48.0° below the horizontal. if we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.)

You are traveling in a car going at a constant speed of 100km/h down a long, straight highway. you pass another car going in the same direction which is traveling at a constant speed of 80km/h. as measured from your car's reference frame this other car is traveling at −20km/h. what is the acceleration of your car as measured from the other car's reference frame? what is the acceleration of the other car as measured from your car's reference frame?