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anonymous

  • 5 years ago

A lighthouse is 1 mile from a perpendicular shore with a night light rotating at a rate of 6 revolutions per minute. How fast is the light beam moving down the shore line when it is 1 mile from the perpendicular?

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  1. anonymous
    • 5 years ago
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    the circumference of the circle of rotation is 2*pi*r = 2*pi miles. Since it rotates 6 times per minute, the speed is 2*pi/6 miles/minute

  2. anonymous
    • 5 years ago
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    or did i not understand the question

  3. anonymous
    • 5 years ago
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    The question is asking for the speed of the exact moment when the light beam is perpendicular to the shore line.

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