You are in a hot air balloon, 400 m above the flat Texas plains. The Earth s radius is about 6400 km.?

You look out toward the horizon. How far out can you see−that is, how far is your horizon?

Really confused about this question – answer can be in km or m. Two significant figures in the answer.

I ve finished all the other questions on the homework (none are similar to this one) and the only example in the textbook is one that they don t prove an answer to.

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