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Waveform equation question

  1. Mar 21, 2014 #1
    1. The problem statement, all variables and given/known data

    Q) State the equations of the wave forms which:

    a) Leads sin ωt by ∏/2
    b) Lags sin (ωt+∏/6) by ∏/3

    2. Relevant equations

    I could not think of any relevant equations.

    3. The attempt at a solution

    a)Sin ωt will be when t=0
    Sin ω(t-a) will be 0 when t-a, since t-a=0
    The function to be 0 when t=-∏/2

    b)Sin(ωt+∏/6) will be 0 when ωt+∏/6 =0 or t=-∏/6ω
    The function to be 0 when t=-∏/6ω + ∏/3= (-∏+2∏ω/6ω)

    Got this far need more help though.
  2. jcsd
  3. Mar 21, 2014 #2
    If a question states speaks of the words ''lead'' and ''lag'' it means the angle ''leads'' or 'lags'' by the given amount.

    • Lead : Lead means to be ''greater than''
    • Lag : Lag means to be ''lesser than''.

    So leading by π/2 means the angle to be found out is greater than the given angle by π/2.

    Hope you've understood!
    Best of luck!
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