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    Instantaneous speed

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    A lighthouse is located on a small island 3 km away from the nearest point P on a straight shoreline and its light makes four revolutions per minute. How fast is the beam of light moving along the shoreline when it is 1 km from P?

    © BrainMass Inc. brainmass.com March 4, 2021, 6:03 pm ad1c9bdddf
    https://brainmass.com/physics/speed-of-light/instantaneous-speed-26539

    Solution Summary

    This uses calculus to determine the rate of speed of a light along a shoreline from a lighthouse.

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