The molecular weight of nitrogen, N2, is 28 g/mol. What is the rms speed of nitrogen molecules in a cooler at 8.0°C? The Boltzmann constant is 1.38 × 10-23 J/K and NA = 6.022 × 1023 molecules/mol
A) 450 m/s
B) 500 m/s
C) 550 m/s
D) 600 m/s
E) 650 m/s
B
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The verdict at the end of the Extraordinary Claims box says “Likely correct, though may never be possible to prove definitively.” In the context of models, which of the following best explains this verdict?
a. A model that precisely reproduces major characteristics of the Moon would seem likely correct, but we can’t go back in time to see that it actually happened that way. b. Models are not reality, and we can never trust their results to reflect what might happen in the real world (or universe). c. No model could ever be good enough to reproduce the major characteristics of the Moon. d. Models are very vague, and cannot be used to make mathematically precise predictions.
Dwarf planet Pluto was discovered by perturbations of
A) Jupiter. B) Saturn. C) Uranus and Neptune. D) all of the above
Aline says that the magnetic moment of an atom originates in the orbital angular momentum of the electron. Bevis says that it comes from the electron spin. Which one, if either, is correct, and why?
a. Aline, because only atoms, not electrons, can have angular momentum. b. Bevis, because only atoms, not electrons, can have angular momentum. c. Neither, because electron spin and orbital angular momentum always cancel exactly. d. Neither, because the magnetic moment of an atom comes only from the spin of the nucleus. e. Both, because both the orbital angular momentum and the spins of the electrons contribute to the magnetic moment of an atom.
A proton that is initially at rest is accelerated through an electric potential difference of magnitude 500 V. What speed does the proton gain? (e = 1.60 × 10-19 C , mproton = 1.67 × 10-27 kg)
A) 2.2 × 105 m/s B) 1.1 × 105 m/s C) 9.6 × 105 m/s D) 3.1 × 105 m/s