Air near the equator averages higher temperatures than air near the poles because
A) polar air is cooled by ice and snow on the ground.
B) solar energy is readily absorbed due to increased levels of CO2 and water vapor in the air.
C) sunlight falls in a more vertical position at the equator than near the poles.
D) the oceans near the equator are warmer than those near the poles.
Answer: C
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Grandfather clocks are designed so they can be adjusted by moving the weight at the bottom of the pendulum up or down. Suppose you have a grandfather clock at home that runs fast
Which of the following adjustments of the weight would make it more accurate? (There could be more than one correct choice.) A) Decrease the amplitude of swing by a small amount. B) Add more mass to the weight. C) Lower the weight. D) Raise the weight. E) Remove some mass from the weight.
A container is filled with a mixture of helium (light molecules) and oxygen (heavy molecules) gases. A thermometer in the container reads 22°C. Which gas molecules have the greater average kinetic energy?
A) It is the same for both of the gases because the temperatures are the same. B) The oxygen molecules do because they are diatomic. C) The oxygen molecules do because they are more massive. D) The helium molecules do because they are less massive. E) The helium molecules do because they are monatomic.
The most distant stars we can measure stellar parallax for are approximately
A) 50 parsecs away. B) 500 parsecs away. C) 5,000 parsecs away. D) halfway across the Milky Way Galaxy. E) in the Andromeda Galaxy.
Most of the detailed information about the planets in our solar system comes from
A) telescopic observations from Earth B) robotic spacecraft C) human visits D) meteorites