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Homework Help: The Rotational Variables

  1. Sep 1, 2006 #1
    Figure 10-21b is a graph of the angular position of the rotating disk of Fig. 10-21a.

    Figure 10-21

    (a) Is the angular velocity of the disk positive, negative, or zero at t = 1 s?
    positive
    negative
    zero
    (b) Is the angular velocity of the disk positive, negative, or zero at t = 2 s?
    positive
    negative
    zero
    (c) Is the angular velocity of the disk positive, negative, or zero at t = 3 s?
    positive
    negative
    zero
    (d) Is the angular acceleration positive or negative?
    positive
    negative
     

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  3. Sep 2, 2006 #2

    andrevdh

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    Homework Helper

    The angular velocity is per definition

    [tex]\omega = \frac{d\theta}{dt}[/tex]

    which means that the angular velocity is the gradient of the tangential to the angular position versus time curve.
     
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