Which of the following statements is true of interstellar dust?
A) It makes up about 10 percent of the mass of the interstellar medium.
B) The average size of particles of interstellar dust is 1 micrometer.
C) It is made mostly of carbon and silicates mixed with frozen water.
D) It is uniformly distributed through space.
C
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What do you do to the control rods of a reactor in order to shut it down?
a. push them into the core b. pull them out of the core c. nothing—it's the cooling water that shuts down the reactor d. none of the above
After a proton with an initial speed of 1.50 × 105 m/s has increased its speed by accelerating through a potential difference of 0.100 kV, what is its final speed? (e = 1.60 × 10-19 C , mproton = 1.67 × 10-27 kg)
A) 3.55 × 105 m/s B) 8.80 × 105 m/s C) 2.04 × 105 m/s D) 4.56 × 105 m/s E) 1.55 × 106 m/s
A quantity of a monatomic ideal gas expands to twice the volume while maintaining the same pressure. If the internal energy of the gas were U0 before the expansion, what is it after the expansion?
a. U0 b. 2U0 c. 4U0 d. The change in temperature must also be known to answer this question.
Determine the change in entropy (in J/K) when 5.00 moles of an ideal gas at 0°C are compressed isothermally from an initial volume of 100 cm3 to a final volume of 20 cm3
a. ?191 b. ?52 c. ?71 d. ?67 e. ?208