How many 1-kilometer across asteroids would it take to make an object as large as the Earth?
Answer: N = 2 x 10^12
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The Earth is closest to the Sun in which month of the year?
July June March January
The organisms called ______________ were the first organisms with eyes and were wiped out at the end of the Paleozoic era
Fill in the blank(s) with correct word
The similarity that Newton recognized between a falling apple and the moon was
A) the force on both is directed toward Earth's center. B) both have an acceleration that is directed toward the center of Earth. C) Both of the above. D) Actually there is no important similarity between these two. E) None of the above.
Find the force exerted by reflecting sunlight off a reflecting aluminum sheet in space if the area normal to the sunlight is 10 000 m2 and the solar intensity is 1 350 W/m2
a. 0.72 N b. 0.09 N c. 9 N d. 45 N e. 0.18 N