Part A) Sand dunes in a desert move over time as sand is swept up the windward side to settle in the lee side. Such as "walking" dunes have been known to walk 19.3 ft in a year and can travel as much as 94.4 ft in particularly windy times. Calculate the average "walking" speed in normal times in units of m/s. Also calculate the average "walking" speed in windy times.
Part B) Fingernails grow at the rate of drifting continents, about 10.9mm per year. Approximately how long did it take for North America to seperate from Europe, a distance of about 3146mi? 1 mile is 1609 m. Answer in units of y.