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    Maria A Gonzale's Avatar
    Maria A Gonzale Posts: 13, Reputation: 1
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    #1

    Oct 30, 2008, 11:06 AM
    String confusion
    A girl ties a toy airplane to end of string, and swings it around her head. The plane's average angular speed is 2.4 rad/s. In what time interval will the plane move through an angular displacement for 3.8 rad?
    So how do I get started?? :confused:
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Oct 31, 2008, 10:31 AM

    Remember rate times time equals distance? Well here you know the rate (2.4 radians/sec) and the distance (3.8 radians), so can you calculate the time? Perhaps what's confusing you is that the units are in radians, whereas you're used to seeing rate/time/distance problems in linear units like meters -- but you use the same technique. Hope this helps.
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