Let k be the Boltzmann constant. If the thermodynamic state of a gas at temperature T changes isothermally and reversibly to a state with three times the number of microstates as initially, the energy input to the gas as heat is:
A. Q = 0
B. Q = 3kT
C. Q = ?3kT
D. kT ln 3
E. ?kT ln 3
Answer: D. kT ln 3
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Which of the following statements best describes Kepler's 3rd law of planetary motion?
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John's face is 20 cm in front of a concave shaving mirror of focal length 30 cm. How large an image does he observe?
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Two very long parallel wires carry currents in the positive x direction. One wire (current = 15 A) is coincident with the x axis. The other wire (current = 50 A) passes through the point (0, 4.0 mm, 0). What is the magnitude of the magnetic field at the point (0, 0, 3.0 mm)?
A. 3.8 mT B. 2.7 mT C. 2.9 mT D. 3.0 mT E. 0.6 mT
Which of these happens when one kilogram of uranium undergoes nuclear fission?
A) About one percent of the matter is converted to other forms of energy. B) Heat and other forms of energy are created, but no matter is actually lost (or destroyed) in the process. C) About one percent of the matter disappears, but no other forms of energy are created. D) All the uranium is converted to other forms of energy. E) An unmeasurably small amount of matter is converted to other forms of energy.