Isaac Newton was able to estimate a value for G, the universal gravitational constant, from the following data: the radius of the Earth is about 6400 km, the average density of rocks is about 5.50 g/cm3, and g = 9.80 m/s2 near the surface of the Earth. What value did Newton obtain for G?
6.65 × 10^?11 N/m2/kg2
Physics & Space Science
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Velma bicycles northward at an unchanging speed of 4 m/s, and Mort jogs southward at an unchanging speed of 4 m/s. Mort's velocity relative to Velma is
A) 4 m/s southward. B) 8 m/s northward. C) 4 m/s northward. D) zero. E) 8 m/s southward.
Physics & Space Science
During one year, what is the apparent change in the noonday Sun's overhead latitude?
Physics & Space Science
A kilometer contains 1 million meters
a. True b. False Indicate whether the statement is true or false
Physics & Space Science
All but the most inactive metals react with acids to give
a. hydrogen and the metal salt. b. hydrogen and the metal hydroxide. c. hydrogen and the metal oxide. d. oxygen and the metal hydride.
Physics & Space Science