Light behaves primarily as a particle when it
A) travels from one place to another.
B) interacts with matter.
C) both of these
D) neither of these
Answer: B
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The mass of 1 cubic meter of fresh water is 1,000 kg. At the top of a 100 m hydroelectric dam the potential energy of the cubic meter of water is
a. 10,000 N. b. 98,000 N. c. 100,000 N. d. 980,000 N.
If a sound level increases by 40 dB, the intensity increases by a factor of ______________
a. one hundred thousand b. ten thousand c. one thousand d. one million
Both RR Lyrae and Cepheid variables are giants that ________ in size over time
Fill in the blank(s) with correct word
Consider a child who is swinging. As she reaches the lowest point in her swing:
a. the tension in the rope is equal to her weight. b. the tension in the rope is equal to her mass times her acceleration. c. her acceleration is downward at 9.8 m/s2. d. none of the above.