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Home > CALC > Chapter 11 > Lesson 11.4.1 > Problem 11-130

11-130.

Multiple Choice: The luminous intensity of a light bulb, measured in lumens per ft, varies inversely as the square of the distance s from the bulb. lumens per ft when ft for a watt bulb. If you are moving away from a watt bulb at a speed of feet per second and you are feet from the bulb, the luminous intensity is changing at the rate of:

  1.  lumens per ft

  1.  lumens per ft

  1.  lumens per ft

  1.  lumens per ft

  1.  lumens per ft


When , ?
Substitute in the known values and solve for .