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Draw a pendulum

  1. Feb 12, 2006 #1
    Please Help!

    ok could someone plesae help me with this question

    I had to draw a pendulum and the questions asks what is the length of the pendulum if the period is .75 s so i got .142 m then it asks what is the speed of the pendulum at the bottom of its swing if the angle that makes its maximum displacement is 11 degrees? wow do i do that... I have no idea?????

    PLEASE HELP!!!!!!!!
  2. jcsd
  3. Feb 12, 2006 #2
    c'mon 11 views no help im sure someone out there knows it
  4. Feb 12, 2006 #3


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    Homework Helper

    HINT 1: What is the difference in height between the highest and lowest positions of the pendulum.

    HINT 2: Energy is conserved. :)
  5. Feb 12, 2006 #4
    difference is .142m - .03m i dont see how it helps
  6. Feb 12, 2006 #5
    is teh answer by any chance .16 or .23
  7. Feb 12, 2006 #6


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    What are the units of speed? And how did you get those numbers?
  8. Feb 12, 2006 #7
    .23 m/s

    (spi/.75)(.142sin11)= .23m/s
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