Which of the following lists the two key predictions of the Big Bang model that have been verified by observations?
A) (1) the existence of the cosmic microwave background and (2) the amount of helium relative to hydrogen in the universe
B) (1) the existence of the cosmic microwave background and (2) the existence of dark matter
C) (1) the existence of the cosmic microwave background and (2) the near-critical density of the universe
D) (1) the predominance of matter over antimatter and (2) the near-critical density of the universe
E) (1) the predominance of matter over antimatter and (2) the large-scale structure of galaxies
A) (1) the existence of the cosmic microwave background and (2) the amount of helium relative to hydrogen in the universe
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Concentrations of ozone-eating atoms or molecules in the neighborhood of one in a thousand pose no threat to the ozone layer
What will be an ideal response?
Why are remote sites chosen for ground-based telescopes?
A. Populated areas produce light pollution that degrades the quality of observations. B. Deserts and mountaintops tend to be cloud-free, making observations convenient. C. Remote areas have less interference from power lines and other sources of noise. D. Mountaintops allow astronomers to avoid morning hazes. E. All of these choices are correct.
A metallic coin is given a negative electric charge. Its mass:
1.increases measurably. 2.increases by an amount too small to measure directly. 3.remains unchanged. 4.decreases by an amount too small to measure directly. 5.decreases measurably.
Carts A and B have equal masses and travel equal distances on straight frictionless tracks while a constant force F is applied to A, and a constant force 2F is applied to B. The relative amounts of work done by the two forces are related by
a. WA = 4 WB. b. WA = 2 WB. c. WA = WB. d. WB = 2 WA. e. WB = 4 WA.