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17 March, 16:01

New York is roughly 3000 miles from Seattle. When it is 10:00 A. M. in Seattle, it is 1:00 P. M. in New York. Using this information, estimate (a) the rotational speed of the surface of Earth, (b) the circumference of Earth, and (c) the radius of Earth.

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  1. 17 March, 18:18
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    The time difference between New York and Seattle is 3 hours. Since there is a 24 hour time difference in the globe, the equation is expressed (3/24) * circumference of Earth = distance. Distance is equal to 3000 miles hence the circumference is equal to 24,000 miles. The radius then is equal to 24,000/2 pi or 12,000 / pi. The rotational speed is 3000 miles / 3 hours or 1000 miles/hr.
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