(a) Sand dunes on a desert island move as sand is swept up the windward side to settle in the leeward side. Such "walking" dunes have been known to travel 24 feet in a year and can travel as much as 105 feet per year in particularly windy times. Calculate the average speed in each case in m/s.

(b) Fingernails grow at the rate of drifting continents, about 10mm/yr. Approximately how long did it take for North America to separate from Europe, a distance of about 3540 miles?
Note I would also like to see the problems solved as opposed to only the answers. Thanks a bunch.

Originally Posted by Monet
(a) Sand dunes on a desert island move as sand is swept up the windward side to settle in the leeward side. Such "walking" dunes have been known to travel 24 feet in a year and can travel as much as 105 feet per year in particularly windy times. Calculate the average speed in each case in m/s.

(b) Fingernails grow at the rate of drifting continents, about 10mm/yr. Approximately how long did it take for North America to separate from Europe, a distance of about 3540 miles?
Note I would also like to see the problems solved as opposed to only the answers. Thanks a bunch.
(a) $\displaystyle avg \, speed = \frac{total \, distance}{total \, time}$

to start, you need to convert ft to meters and a year to seconds

(b) $\displaystyle total \, time = \frac{total \, distance}{avg \, speed}$

you'll need to convert 3540 miles to millimeters

in future, post physics topics in the math topics forum

Originally Posted by skeeter
in future, post physics topics in the math topics forum
Probably he thought that they were physics questions since those involved real world problem. Some ignorant students think that way.

Originally Posted by Monoxdifly
Probably he thought that they were physics questions since those involved real world problem. Some ignorant students think that way.
Actually this kind of question is common at the beginning of Intro Physics classes.

-Dan