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    tjbny47's Avatar
    tjbny47 Posts: 1, Reputation: 1
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    #1

    Sep 29, 2015, 01:50 PM
    Speed
    If an axial that spins at a fixed rpm has an 8" tires attached and another identical axial spinning at the same rpm has 10" attached to it. Do the 10" tires move the vehicle faster or the same speed?
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Sep 29, 2015, 01:58 PM
    Think about the speed of the outside edge of the wheel. There's a formula for that:



    where is the angular velocity in radians/second. So can you tell form this whether the outside of the wheel moves at the same speed if r=10" versus r=8"?
    ma0641's Avatar
    ma0641 Posts: 15,675, Reputation: 1012
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    #3

    Sep 30, 2015, 11:34 AM
    Lets get real absurd. Instead of an 8" tire, you have a 1" tire. Now what do you think? Picture it in your mind and, in addition to velocity, remember formula for a circumference: Pi X d. How much distance is covered in 1 RPM? Should be easy now.
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