During a reversible adiabatic expansion of an ideal gas, which of the following is NOT true?
A. pV ? = constant
B. pV = nRT
C. T V ??1 = constant
D. |W| = $ p dV
E. pV = constant
Ans: E. pV = constant
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According to current science, why didn't oxygen begin to accumulate in the atmosphere for more than a billion years after life appeared on the Earth?
A) Oxygen was removed from the atmosphere by chemical reactions with surface rocks as quickly as it was released by life. B) Early forms of animal life consumed the oxygen released by plants during the first billion years of life on Earth. C) Early life did not release oxygen, and oxygen releasing organisms didn't evolve for a billion years after the earliest life. D) Oxygen was removed from the atmosphere by dissolving in the ocean as quickly as it was released by life.
A particle (mass = 5.0 g, charge = 40 mC) moves in a region of space where the electric field is uniform and is given by Ex = ?5.5 N/C, Ey = Ez = 0 . If the position and velocity of the particle at t = 0 are given by x = y = z = 0 and vx = 50 m/s, vy = vz = 0, what is the distance from the origin to the particle at t = 2.0 s?
a. 60 m b. 28 m c. 44 m d. 12 m e. 88 m
All of the following observations are real. Which one does not support the theory that active galactic nuclei are powered by accretion disks around massive black holes?
A) X-ray emission from active galactic nuclei can vary significantly in times as short as a few days. B) The total luminosity of an active galactic nucleus can be as high as about 10 billion times that of the Sun. C) Spectra of active galactic nuclei show that clouds of gas are orbiting a central object at very high speed. D) The most luminous active galactic nuclei have huge redshifts.
Suppose you have a rock that, when it solidifies, contains 1 microgram of a radioactive isotope. How much of this isotope remains after five half-lives?
a. 1/32 microgram b. none c. 1/16 microgram d. 1/8 microgram e. Cannot be determined without knowing the daughter isotope.