If ice were denser than water, during winter lakes and ponds would
A) completely freeze
B) remain liquid
C) freeze on the surface but remain liquid beneath
D) freeze on the bottom but remain liquid at the surface
A
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Nuclear Binding Energy: One of the fusion reactions that occurs in the sun is:
The following atomic masses are known:
What is the reaction energy released in this fusion reaction? (1 u = 931.5 MeV/c2)
A. 11 MeV B. 13 MeV C. 15 MeV D. 17 MeV E. 19 MeV
Series/Parallel Circuits: You obtain a 100-W light bulb and a 50-W light bulb. Instead of connecting them in the normal way, you devise a circuit that places them in series across normal household voltage. If each one is an incandescent bulb of fixed resistance, which statement about these bulbs is correct?
A. Both bulbs glow with the same brightness, but less than their normal brightness. B. Both bulbs glow with the same brightness, but more than their normal brightness. C. The 100-W bulb glows brighter than the 50-W bulb. D. The 50-W bulb glows more brightly than the 100-W bulb.
The number of cycles of a periodic process that occur per unit time is called the period
a. True b. False Indicate whether the statement is true or false
You carry a 20-N box 5 m horizontally across a room. The work you do is
a. 0 b. 4 J. c. 100 J. d. none of the above.