Which of the following is a longitudinal wave?
A) sound
B) light
C) radio
D) all of the above
E) none of the above
Answer: A
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Dry air at 20ºC, 101 kPa, passes through a 2-cm diameter tube at 5 m/s. If the tube is also at 20ºC and has acetone on its inside surface area, estimate the evaporation rate of acetone into air per unit area. Assume the density of saturated vapor acetone is 2.37 g/m^3.
What will be an ideal response?
If the Sun was gradually compressed while maintaining its mass in order to form a black hole, how would the curvature of spacetime be affected at the location of the Earth?
A) It would not change because the mass of the Sun is not changing. B) The curvature would become greater because a black hole has stronger gravity than the Sun. C) The curvature would be reduced because the Sun would get so much smaller. D) Compressing the Sun would not form a black hole because a black hole needs to be at least 2—3 times the mass of the Sun.
Protons are being accelerated in a particle accelerator. When the energy of the protons is doubled, their de Broglie wavelength will
A) increase by a factor of 4. B) increase by a factor of 2. C) decrease by a factor of 2. D) increase by a factor of . E) decrease by a factor of .
Which is a reasonable restatement of the second law of thermodynamics?
a. The orderliness of the universe increases. b. All heat engines exhaust heat to their surroundings. c. Force equals mass times acceleration. d. Single-temperature heat engines can be built. e. Heat sometimes flows spontaneously from colder to warmer objects.