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Homework Help: Rearranging Formulas

  1. Sep 13, 2004 #1
    can u just check if these questions are correct.
    a) P=W/t for t
    answer t=w/p
    b)e=IR+Ir for I
    ANSWER, I=R/e+r/e
    c) x=a/y for y
    d)F=ma for a
    answer F/m=a
  2. jcsd
  3. Sep 13, 2004 #2
    b) should be : I = e/(R + r)
    c) should be : y = a/x
  4. Sep 14, 2004 #3
    Expressed step by step for clarity the solution to (b) is as follows:

    e = IR + Ir
    e = I(R + r)
    I = e/(R +r)
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