In Newton's law of universal gravitation, F = Gm1m2/r2 for uniform objects, the quantity r is______________
Fill in the blank(s) with correct word
the distance between the centers of m1 and m2
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A boy on a bicycle approaches a brick wall as he sounds his horn at a frequency 400 Hz. The sound he hears reflected back from the wall is at a frequency 408 Hz
At what is the speed is the boy riding his bicycle toward the wall? Assume the speed of sound in air is 340 m/s. A) 3.68 m/s B) 333 m/s C) 6.67 m/s D) 6.80 m/s E) 3.37 m/s
Which statement below correctly describes the relationship between expansion rate and age for the universe?
A) the faster the rate of expansion, the younger the age of the universe B) the faster the rate of expansion, the older the age of the universe C) Age is independent of the expansion rate.
The Huygens probe is an example of which kind of robotic spacecraft?
A) orbiter B) sample return C) lander D) flyby
The entropy of a perfect crystal at absolute zero kelvin with the atoms at rest is equal to _____________.
Fill in the blank(s) with the appropriate word(s).