Why is carbon dioxide important in maintaining a greenhouse effect?
What will be an ideal response?
Earth's atmosphere is transparent to sunlight, and when the ground absorbs the sunlight, it grows warmer and radiates at infrared wavelengths. However, CO2 makes the atmosphere less transparent to infrared radiation, so infrared radiation from the warm surface is absorbed by the atmosphere and cannot escape back into space. That traps heat and makes Earth warmer.
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The resistivity of a material is doubled when heated a certain amount. What happens to the resistance of a resistor made of this material when heated the same amount?
a. It doubles. b. It quadruples. c. It halves. d. It stays the same.
Suppose current is flowing in a wire from right to left. Which way do the electrons in the wire move?
a. right to left b. left to right c. in circles d. It is impossible to tell.
What magnitude net force is required to accelerate a 1200-kg car uniformly from 0 m/s to 27.0 m/s in 10.0 s?
A) 1620 N B) 11800 N C) 4360 N D) 444 N E) 3240 N
Has a nuclear device ever been exploded by a terrorist?
A) No, although a terrorist has been arrested who possessed and planned to use a stolen nuclear weapon. B) No, although a terrorist has been arrested who possessed and planned to use a dirty bomb. C) No, in fact there are no known instances of terrorists even possessing a nuclear device. D) Yes, a small dirty bomb was exploded during the Iraq War. E) Yes, terrorists have entered a nuclear power plant in Pakistan and dispersed radioactive materials.