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Math Help - Test yourself Find the missing data.

  1. #1
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    Find the missing data.

    a.) v = 54Π cm / min, w = 1.5 rev / min

    b.) = 315⁰, t = 15 sec

    c.) = 3Π/2, r = 35 cm

    d.) s = 25.4 cm, r = 19 cm

    e.) r = 25 cm, w = 8Π rad / min

    Given Formula's:
    v = wr
    = s/r
    r=s/

    Very urgent i only need one answer per problem. So if there's someone can answer at least one of it. please help.
    Last edited by jcrodua; August 31st 2008 at 09:55 AM.
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  2. #2
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by jcrodua View Post
    a.) y = 54Π cm / min, w = 1.5 rev / min

    b.) = 315⁰, t = 15 sec

    c.) = 3Π/2, r = 35 cm

    d.) s = 25.4 cm, r = 19 cm

    e.) r = 25 cm, w = 8Π rad / min

    Given Formula's:
    v = wr
    = s/r
    r=s/

    Very urgent i only need one answer per problem. So if there's someone can answer at least one of it. please help.
    use the formulas you were given and calculate what you don't know. for example, for (d) you know r and r, so use the second formula you were given, plug in s and r and solve for \theta
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  3. #3
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    Quote Originally Posted by Jhevon View Post
    use the formulas you were given and calculate what you don't know. for example, for (d) you know r and r, so use the second formula you were given, plug in s and r and solve for \theta

    I already got the answer of b,c,d and e. My only problem now is a. Since using the v=wr and both v and w are given the missing data would be the r=?. So how will i do that?
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  4. #4
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by jcrodua View Post
    I already got the answer of b,c,d and e. My only problem now is a. Since using the v=wr and both v and w are given the missing data would be the r=?. So how will i do that?
    yes, you are given v and w. use the first formula
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  5. #5
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    Can you give me idea on how to transpose that formula to find r?
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  6. #6
    is up to his old tricks again! Jhevon's Avatar
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    Quote Originally Posted by jcrodua View Post
    Can you give me idea on how to transpose that formula to find r?
    r is being multiplied on the right side by w. to get rid of w, perform its opposite operation. that is, divide both sides by it. you get:

    r = v/w
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