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Frequency of a wave?

  1. Dec 4, 2011 #1
    1. The problem statement, all variables and given/known data
    Ok so im given that a pendulum swings 41.35 seconds in 20 cycles. I have to find the frequency of that pendulum

    2. Relevant equations
    i know that f=1/T where T is period b/c frequency and period are reciprocal to each other.
    i also know that f = N/t where t is the time for i think 1 cycle? but i dont know N

    3. The attempt at a solution
    Im not given Period so i have no idea how to solve for this. Please help! and please be specific on how u got your answer. Thx
  2. jcsd
  3. Dec 4, 2011 #2
    Period is the time for ONE cycle.
    You are given the time for 20 cycles.
    Can you find the time for one?

    You know the relationship between period and frequency.
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