A helium-filled balloon has a volume of 1 m3 . As it rises in the earth's atmosphere, its volume expands. What will its new volume be (in m3) if its original temperature and pressure are 20°C and 1 atm, and its final temperature and pressure are ?40°C and 0.1 atm?
a. 4
b. 6
c. 8
d. 10
e. 1.5
c
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Parallel Wires: An object is hung using a metal spring. If now a current is passed through the spring, what will happen to this system?
A. The spring will contract, raising the weight. B. The spring will extend, lowering the weight. C. The weight will not move. D. The spring will begin to swing like a pendulum. E. None of these are true.
The two fundamental laws that lie at the heart of quantum mechanics are
A) the absoluteness of the speed of light and the equivalence principle. B) the law of conservation of energy and the electromagnetic force law. C) the uncertainty principle and the exclusion principle. D) the law of conservation of angular momentum and the law of conservation of energy. E) the law of quantum degeneracy and the law of inviolate absolutes.
A deuterium nucleus and a tritium nucleus react to yield one alpha particle, a neutron, and energy. For this reaction, the sum of the masses of reaction products after the reaction is ________ the sum of the masses of particles before the reaction.
A. greater than B. equal to C. less than
The reason why the sky is blue is best explained by
a. the greenhouse effect. b. Rayleigh scattering. c. the dew point. d. auroras.