If stars existed but galaxies did not:
A. We would probably still exist anyway.
B. We would not exist because life on Earth depends on the light produced by galaxies.
C. We would not exist because we are made of material that required recycling in galaxies.
Answer: C. We would not exist because we are made of material that required recycling in galaxies.
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Latent Heats: A .20-kg ice cube at 0.0°C has sufficient heat added to it to cause total melting, and the resulting water is heated to 70.0°C. How much heat is added? For water LF = 334,000 J/kg, LV = 2.256 × 106 J/kg, the c = 4.186 × 103 J/kg ? C.
A. 130 kJ B. 14,000 kJ C. 81 kJ D. 59 kJ
Using a 1-mF capacitor, a 2-mF capacitor, and a 3-mF capacitor, which of the following capacitances cannot be made by a combination that uses all three? (Hint: At most only 2 combinations must be considered to determine the correct answer.)
a. 6/11 mF c. 11/3 mF b. 6 mF d. 7 mF
According to the Big Bang theory, how many forces—and which ones—operated in the universe during the GUT era?
A) 1 force that represented the unification of all four forces that operate today B) 3 forces: gravity, the strong force, and the electroweak force C) 2 forces: the strong force and the electroweak force D) 2 forces: gravity and a single force that later became the strong, weak, and electromagnetic forces
To determine an unknown crystal structure, it would be best to use
(a) The Debye-Scherrer camera (b) The Laue technique (c) A powder diffractometer (d) A single-crystal diffractometer