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17 March, 00:26

You are in a hot air balloon, 350 m above the flat Texas plains. You look out toward the horizon. How far out can you see--that is, how far is your horizon? The Earth's radius is about 6400 km.

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  1. 17 March, 03:43
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    Refer to the diagram shown below.

    x = the distance (horizon) that you can see from the balloon,

    Because the radius of the earth is 6400 km, and the balloon is 350 n above the earth's surface, therefore

    h = 6400 + 0.350 = 6400.35 km.

    From the Pythagorean theorem, obtain

    x = √ (6400.35² - 6400²) = 66.934 km

    Answer: Your horizon is 66.934 km (or 66,934 m)
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