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Physics 10 Online
OpenStudy (anonymous):

You are in a hot air balloon, 200 m above the flat Texas plains. you look out towards the horizon. How far out can you see- that is, how far is your horizon?The Earth's radius is about 6400km.

OpenStudy (anonymous):

You need to do Pythagoras. |dw:1377961695804:dw| Solve for h :) (If you need help for this too, or dont understand the diagram, tell me)

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