(a) Sand dunes on a desert island move as sand is sweptup

Chapter 2, Problem 2.2

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(a) Sand dunes on a desert island move as sand is sweptup the windward side to settle in the leeward side. Suchwalking dunes have been known to travel 20 feet in a year and can travel as much as 100 feet per year in partic-ularly windy times. Calculate the average speed in eachcase in m/s. (b) Fingernails grow at the rate of driftingcontinents, about 10 mm/yr. Approximately how long didit take for North America to separate from Europe, a dis-tance of about 3 000 mi?

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