Which of the following statements is(are) correct when an ideal gas goes from an initial to a final state in a single process?
a. No work is done on or by the gas when the volume remains constant.
b. No energy is transferred into or out of the gas as heat transfer when the temperature remains constant.
c. The internal energy of the gas does not change when the pressure remains constant.
d. All the statements above are correct.
e. Only statements (a) and (b) above are correct.
A
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The flatness problem and horizon problem
a. are solved if there was a sudden inflation of the Universe at time before recombination occurred. b. show that the Universe can be described as static and unchanging. c. show that dark matter must be a small fraction of the total mass of the Universe. d. imply that the Universe was once much colder than it is now. e. imply that the inflationary theory is incorrect.
Answer the following statement(s) true (T) or false (F)
1. Since the laws of physics are the same in every inertial reference frame, there is no meaningful physical distinction between an inertial frame at rest and one moving at a constant velocity 2. Since the laws of physics are the same in every reference frame, an object must have the same kinetic energy in all inertial reference frames. 3. Since the laws of physics are the same in every inertial reference frame, an interaction between objects must be observed to conserve energy in every inertial reference frame. 4. Since the laws of physics are the same in every inertial reference frame, if you perform identical experiments in two different inertial frames, you should get exactly the same results
The dew point is the temperature at which a given humidity equals the saturation density
a. True b. False Indicate whether the statement is true or false
How much charge can be placed on a capacitor of plate area 15 cm2 with air between the plates before it reaches "atmospheric breakdown" where E = 3.0 × 10^6 V/m? (?0 = 8.85 × 10^?12 C2/N?m2)
a. 4.0E–8 C b. 1.3E–8 C c. 1.8E–10 C d. 5.1E–8 C e. 1.7E–8 C