Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Don't you just love related rates?

  1. Nov 20, 2005 #1
    The angle of elevation of the Sun is decreasing at a rate of 0.25 rad/h. How fast is the shadow cast by a 400-ft-tall building increasing when the angle of elevation of the Sun is π/6?

    I thought about using the special triangle to find exact values for trig functions at π/6 but I don't know which equation I should use to relate the rate of change. What should I do? :uhh:
     
  2. jcsd
  3. Nov 20, 2005 #2

    Tide

    User Avatar
    Science Advisor
    Homework Helper

    Just write [itex]L = H \cot \theta[/itex] with the obvious definitions and differentiate.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook