Did Tycho's data prove that Kepler' theory was true?
A) No, because some of Tycho's observations were incorrect.
B) No, because observations can never completely prove the truth of scientific theory.
C) No, because Tycho's data disagreed with Kepler's theory.
D) Yes, because Kepler's theory agreed with all of Tycho's data.
E) Yes, because Tycho's data ruled out the competing theories of Ptolemy and Copernicus.
B
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Answer the following statement true (T) or false (F)
In a typical transmission line, the current I is very small and the voltage V is very large. A unit length of line has resistance R. For a power line that supplies power to 10,000 households, we can conclude that
A. IV = I 2R. B. I = V/R. C. IVI 2R. E. I 2R = 0.
If the distance between two point charges is doubled, the mutual force between them will be changed by what factor?
a. 4 b. 2 c. 1/2 d. 1/4 e. 1
The estimated number of stars in the Milky Way is about how many billion?
a. 1 to 2 b. 100 to 200 c. 10 to 20 d. 1000 to 2000