According to scientists, the naturally occurring greenhouse effect makes Earth about 31?C warmer than it would be if there were no greenhouse gases in our atmosphere. How do scientists "know" what Earth's temperature would be without greenhouse gases?
a. Ancient fossils allow them to infer Earth's temperature at a time before our atmosphere contained greenhouse gases.
b. They estimate it by averaging guesses made by many individual scientists.
c. They assume that this temperature would be about the same as the temperature of Mars, which has much less of an atmosphere than Earth.
d. They calculate this temperature from Earth's reflectivity and distance from the Sun.
Answer : d. They calculate this temperature from Earth's reflectivity and distance from the Sun.
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According to the Aristotelian view of motion, which of these would NOT work?
a. an arrow flying away from a bow a rocket ship going to the moon b. an apple falling from a tree to the ground a person climbing a tree c. a stone dropping through water to the creek bed
A non-uniform meter stick is found to balance on a knife edge at the 60-cm mark. Where is the center of gravity of the meter stick?
A. at the 40-cm mark B. at the 45-cm mark C. at the 50-cm mark D. at the 55-cm mark E. at a position not given
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