1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Optics: What is the speed of the sprinter's image?

  1. Sep 23, 2008 #1
    1. The problem statement, all variables and given/known data
    A sports photographer has a 150 mm focal length lens on his camera. The photographer wants to photograph a sprinter running straight away from him at 5 m/s. What is the speed of the sprinter's image at the instant the sprinter is 10 m in front of the lens?


    2. Relevant equations



    3. The attempt at a solution

    Here's my best guess:

    (1/f)=(1/s')+(1/s) (1/.150m)= (1/s') + (1/10m) s'=.152, so the absolute value of the magnification is (.152/10m)= -.0152

    and (.0152)(5m/s)= .076 m/s = 76 mm/s Is this anywhere close to correct?
     
  2. jcsd
  3. Sep 23, 2008 #2
    Any thoughts about this one?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Optics: What is the speed of the sprinter's image?
  1. Optics, image (Replies: 16)

Loading...