Describe how Eratosthenes measured the circumference of our ...

[Shelles]

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.

[kswal303]

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]

Both answers were spot on, thank you once again

[kswal303]

Great! Please up vote