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Author Question: Describe how Eratosthenes measured the circumference of our planet. What will be an ideal ... (Read 66 times)

Shelles

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on: Jul 27, 2018
Describe how Eratosthenes measured the circumference of our planet.
 
  What will be an ideal response?

Question 2

The helium flash converts helium nuclei into
 
  A) iron. B) beryllium. C) carbon. D) oxygen. E) boron.


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kswal303

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Reply #1 on: Jul 27, 2018
Answer to Question 1

Using the fact that the noon solstice Sun was directly overhead at Syene, on the Tropic of Cancer, yet was 7 degrees south of the zenith in Alexandria, Eratosthenes realized this was due to the curvature of the Earth, and that the 7 degrees was about 1/50th of the Earth's total circumference, so the Earth must be about fifty times larger in circumference than the 800 kilometer separation between Alexandria and Syene, or about 40,000 kilometers around.

Answer to Question 2

C


Shelles

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Reply #2 on: Jul 27, 2018
Both answers were spot on, thank you once again


kswal303

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Reply #3 on: Jul 27, 2018
Great! Please up vote :D


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