The idea of inflation makes one clear prediction that, until the discovery of an accelerating expansion, seemed to contradict the available observations. What is this prediction?
A) Inflation predicts that the early universe should have regions of enhanced density that could have acted as "seeds" for the formation of galaxies and large structures.
B) The universe should be geometrically "flat" (in the four dimensions of spacetime).
C) Inflation predicts that the temperature of the cosmic microwave background should be almost (but not exactly) the same everywhere.
D) Inflation predicts that the entire universe must be far larger than the observable universe.
B
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Imagine that an external force of 100 N must be applied to keep a bicycle and rider moving at a constant speed of 12 mi/h against opposing air drag. To double the bike’s speed to 24 mi/h, we must increase the magnitude of the force exerted on the bike to
A. 141 N B. 200 N C. 400 N D. It depends on the bike’s shape and area E. Other (specify)
An M type star 1,000 times more luminous than the Sun will be located near the ________ part of the H-R diagram.
A. bottom right B. center C. top left D. top right E. bottom left
The flow of charge in a circuit depends on
A) adequate resistance. B) a potential difference. C) adequate chemical action. D) all of the above
A farsighted person with astigmatism would be prescribed a lens that is
a. diverging only. b. both converging and cylindrical. c. diverging only. d. both converging and cylindrical.