The process by which molecules escape from a solid directly into the gas phase is called
A) gasification
B) evaporation
C) condensation
D) sublimation
D
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Liquid metallic hydrogen is found in the interior(s) of
a. Uranus. b. Neptune. c. Uranus and Neptune. d. neither Uranus nor Neptune.
Calorimetry: Two experimental runs are performed to determine the calorimetric properties of an alcohol which has a melting point of -10.0° C. In the first run, a 200-g cube of frozen alcohol, at the melting point, is added to 300 g of water at 20.0°C in a styrofoam container. When thermal equilibrium is reached, the alcohol-water solution is at a temperature of 5.0°C. In the second run, an identical cube of alcohol is added to 500 g of water at 20.0°C and the temperature at thermal equilibrium is 10.0°C. The specific heat capacity of water is 4190 J/kg ? K. Assume no heat is exchanged with the styrofoam container and the surroundings. What is the heat of fusion of the alcohol?
A. 5.5 × 104 J/kg B. 6.3 × 104 J/kg C. 7.1 × 104 J/kg D. 7.9 × 104 J/kg E. 8.7 × 104 J/kg
Two point charges of +1.0 ?C and -2.0 ?C are located 0.50 m apart. What is the minimum amount of work needed to move the charges apart to double the distance between them? (k = 1/4??0 = 8.99 × 109 N ? m2/C2)
A) +36 mJ B) +18 mJ C) -36 mJ D) 0 mJ E) -18 mJ
Kinetic Energy: A space barge pushes on a spaceship with a mass of 15,000 kg and accelerates it from a speed of 0.600c to a speed of 0.700c. How much work does the barge have to do to accomplish this? (c = 3.00 × 108 m/s)
A. 1.35 × 1020 J B. 2.03 × 1020 J C. 2.70 × 1020 J D. 5.42 × 1020 J E. 8.78 × 1019 J