trigonometry

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A wheel with a 21-inch diameter is turning at the rate of 58 revolutions per minute. To the nearest inch, what is the velocity of a point on the rim in inches/minutes?
3879 inches/minutes

is my answer correct??

  • trigonometry -

    10.5 in * 58 rev/min * 2 pi radians/rev = I get 3826 in/min

  • trigonometry -

    By the way, earlier I notice you were looking for a calculator:

    http://www.mathsisfun.com/scientific-calculator.html

  • trigonometry -

    yes,..the guy was teaching me how to do this problem
    [pi,3pi/2];tan s=1
    can you help..i need to use this link to figure out this problem..please guide me through:)

  • trigonometry -

    We are in quadrant 3
    so add 180 degrees or pi radians to answer whatever we get first
    on calculator
    click radians on upper right
    type in the number 1
    click atan
    answer .785 ......
    click +
    click Pi
    click =
    get 3.926...... radians

  • trigonometry -

    so..5pi/4
    thank you very very much..i just have one LAST problem i need help with

    A pulley of radius 11cm rotates 5 times in 64 seconds. Find the angular velocity of the pulley.
    thnks again

  • trigonometry -

    i think you have to use the formula
    w=pi/t

    maybe..

  • trigonometry -

    Yes, 5 pi/4
    You could have seen that from the start because you probably know that the tan of 45 deg (Pi/4 radians) is 1 and pi/4 + pi = 5 pi/4
    --------------------------------------
    radius has noting to do with this
    5 * 2 pi radians / 64 s
    = (10/64) pi rad/s = .49 rad/s

  • 0.49 rad/s -

    .49 I mean

  • trigonometry -

    so 5pi/32

    thank you soo much!!!!

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