During an isothermal process, 5.0 J of heat is removed from an ideal gas. What is the change in internal (thermal) energy of the gas?
A) 0.00 J
B) 2.5 J
C) 5.0 J
D) 7.5 J
E) 10 J
Answer: A
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Some quasars show absorption spectra with a smaller redshift than their emission spectra; this indicates that:
A) we still don't understand redshifts. B) they are much closer than previously thought. C) there is cooler gas between us and the quasar. D) their black holes are still contracting. E) their black holes are still expanding.
Which of the following best describes the meaning of declination and right ascension?
A) They are coordinates on the celestial sphere that are very similar to the coordinates of altitude and direction on Earth. B) They are used to describe the locations and distances of stars that we see in the night sky. C) They are coordinates on the celestial sphere, with declination telling us the angular distance of an object from the celestial equator and right ascension telling us how far around the celestial sphere an object is located from the vernal equinox. D) They are terms used by astronomers to describe how the sky changes with the seasons.
A 3.5-?F capacitor is attached to a 20-V power supply. How much energy is stored in the capacitor?
a. 7.0E–4 J b. 7.0E–3 J c. 2.5E–4 J d. 2.4E–3 J e. 2.0E–3 J
If 25 kg of ice at 0°C is combined with 4 kg of steam at 100°C, what will be the final equilibrium temperature (in °C) of the system?
a. 40 b. 20 c. 60 d. 100 e. 8