Since there are no folded mountain chains on the Moon, what does this imply about the Moon's geology?
a. Plate tectonics does not exist on the moon
b. The geological history is extremely short.
c. Mountains were worn down by erosion.
d. Mountains were destroyed during the heavy bombardment.
e. Mountains were destroyed during the heavy bombardment.
a
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A container with a one-liter capacity at 27°C is filled with helium to a pressure of 2.0 atm. (1 atm = 1.0 × 10^5 N/m2.) How many moles of helium does it hold?
a. 0.041 b. 0.081 c. 0.45 d. 0.90 e. 1.0
When an object is placed 60. cm from a converging lens, it forms a real image. When the object is moved to 40. cm from the lens, the image moves 10. cm farther from the lens. What is the focal length of the lens?
A) 42. cm B) 50. cm C) 40. cm D) 20. cm E) 30. cm
A merry-go-round spins freely when Janice moves quickly to the center along a radius of the merry-go-round. It is true to say that
A) the moment of inertia of the system decreases and the angular speed increases. B) the moment of inertia of the system decreases and the angular speed decreases. C) the moment of inertia of the system decreases and the angular speed remains the same. D) the moment of inertia of the system increases and the angular speed increases. E) the moment of inertia of the system increases and the angular speed decreases.
Two phases ? and ? are in equilibrium, and they are made of A-type and B-type atoms. Which of the following statements is true?
(a) The Gibbs free energies of the ? and ? phases are equal. (b) The chemical potentials of the A-type atoms in the ? and ? phases are equal. (c) The Gibbs free energies of the ? and ? phases are equal to 0. (d) The chemical potentials of the A-type and B-type atoms in the ?-phase are equal.