Which of the following statements does not lend support to the idea that carbon dioxide is a cause of global warming?
A) Models of the greenhouse effect successfully predict the actual temperatures of Mars and Venus from their atmospheric carbon dioxide amounts.
B) Models of Earth's climate that include recent increases in carbon dioxide concentration match the observed temperature increases better than those that do not include it.
C) We understand the physical mechanism of the greenhouse effect, by which carbon dioxide increases cause an increase in the planet's temperature.
D) Isotope ratios in atmospheric carbon dioxide show that much of the carbon dioxide in Earth's atmosphere today comes from the burning of fossil fuels.
D
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Three pith balls supported by insulating threads hang from a support. We know that ball X is positively charged. When ball X is brought near balls Y and Z without touching them, it attracts Y and repels Z. Since pith is an insulating material, we can conclude that
A. Y has a negative charge. B. Z has a negative charge. C. Y has a positive charge. D. Z is neutral (has no net charge). E. Y is negatively charged or neutral (has no net charge).
What is the maximum number of 100-W lightbulbs you can connect in parallel in a 120-V home circuit without tripping the 20-A circuit breaker?
At what distance from the center of the Earth would one’s weight be half that recorded on the Earth’s surface? Let the Earth's radius be R.
A. 0.71R B. 2R C. 4R D. 1.4R
The angle of incidence can vary between zero and
A) 1 radian. B) ?/2 radians. C) ? radians. D) 2? radians. E) 3?/2 radians.