First Law of Thermodynamics: 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 J
B. 2.5 J
C. 5.0 J
D. 10 J
Answer: A
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Far infrared astronomy must be done from high-flying aircraft because
a. far infrared radiation is absorbed low in Earth's atmosphere. b. far infrared photons are quite energetic. c. far infrared telescopes are not very heavy. d. far infrared sources are very bright. e. None of the other choices are correct.
A fishing-boat captain returns to port saying, "It's rough out there with waves that are 4 meters high." He is probably talking of waves of amplitude
A) 1 m. B) 2 m. C) 3 m. D) 4 m.
Which statement about the behavior of Universe geometries is correct? a. Closed and open universes expand forever
b. Closed universes expand and then contract. c. Only flat universes expand forever. d. Flat and open universes expand and then contract. e. Only flat universes expand and then contract.
Charge of uniform density (40 pC/m2) is distributed on a spherical surface (radius = 1.0 cm), and a second concentric spherical surface (radius = 3.0 cm) carries a uniform charge density of 60 pC/m2 . What is the magnitude of the electric field at a point 4.0 cm from the center of the two surfaces?
a. 3.8 N/C b. 4.1 N/C c. 3.5 N/C d. 3.2 N/C e. 0.28 N/C