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Math Help - SI units Q

  1. #1
    Jonny6001
    Guest

    SI units Q

    In uni I have a module on SI units and basic units, its troubling me a bit unfortunately. I am ok with them but im not very confident that the answer I get is always right which is a bit annoying.

    I have one which I donít really understand.

    P=Tω P=5kW
    Ďní=1440 rev min^-1(rpm)
    (hence derive Ďωí)

    Find value for T in Nm.


    I think the rpm needs to be in seconds but it still does not really fit in, P is power in Kilowatt. I donít suppose I need to work 1440rpm in radians per second do I?
    It just hasnít clicked for me Iím afraid.

    Also, does anyone know of some good books that cover this subject, I have Engineering Mathematics by K A Stroud but it doesnít cover it.

    Thanks a lot guys.
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  2. #2
    Forum Admin topsquark's Avatar
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    Quote Originally Posted by Jonny6001 View Post
    In uni I have a module on SI units and basic units, its troubling me a bit unfortunately. I am ok with them but im not very confident that the answer I get is always right which is a bit annoying.

    I have one which I donít really understand.

    P=Tω P=5kW
    Ďní=1440 rev min^-1(rpm)
    (hence derive Ďωí)

    Find value for T in Nm.


    I think the rpm needs to be in seconds but it still does not really fit in, P is power in Kilowatt. I donít suppose I need to work 1440rpm in radians per second do I?
    It just hasnít clicked for me Iím afraid.

    Also, does anyone know of some good books that cover this subject, I have Engineering Mathematics by K A Stroud but it doesnít cover it.

    Thanks a lot guys.
    Yes, you need rpm in rad/s. Do you know how to convert it?

    -Dan
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