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Thread: Physics: Motion in One Dimension Please Help

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    Physics: Motion in One Dimension Please Help

    (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.
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    Re: Physics: Motion in One Dimension Please Help

    Quote Originally Posted by Monet View Post
    (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
    Last edited by skeeter; Jun 14th 2012 at 06:59 AM.
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    Re: Physics: Motion in One Dimension Please Help

    Quote Originally Posted by skeeter View Post
    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.
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    Re: Physics: Motion in One Dimension Please Help

    Quote Originally Posted by Monoxdifly View Post
    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
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    Re: Physics: Motion in One Dimension Please Help

    Quote Originally Posted by topsquark View Post
    Actually this kind of question is common at the beginning of Intro Physics classes.
    -Dan
    I thought fingernails would fall under Intro to manicures...
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