Observations of the tiny irregularities in the cosmic microwave background support the idea that the Universe
A. must be one of many "island universes."
B. must contain about 5 times more dark matter than regular matter.
C. does not contain dark energy.
D. must contain hidden pockets of antimatter.
Answer: B
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The magnetic field at a distance of 2 cm from a long straight current-carrying wire is 4 ?T. What is the magnetic field at a distance of 4 cm from this wire?
A) 6 ?T B) 2 ?T C) 4 ?T D) 10 ?T E) 8 ?T
Newton's third law of motion states that the force pair acting on different objects consists of two forces that
a. are under the influence of gravity. b. are equal and in the same direction. c. always produce an acceleration. d. are equal and in opposite directions.
What scientist discovered more elements than any other person?
a. Lavoisier b. Boyle c. Berzelius d. Davy
Time-dependent plastic strain is _________strain.
Fill in the blank(s) with the appropriate word(s).