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Un article trouvé pour ce sujet.
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A beam on a lighthouse |
2007-03-28 |
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Lisa pose la question :
A beam on a lighthouse 2000 metres away from the nearest point P on a straight shoreline revolves at the rate of 10 pi radians per minute. How fast is the beam of the light moving along the shoreline when it is 500 metres from P?
Stephen La Rocque lui répond. |
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