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Homework Help: Linear speed and reaction forces

  1. Nov 2, 2004 #1
    Just checking these other problems

    1)Bicycle has wheels with circumference of 2m. What is the linear speed of the bicycle when the wehels rotate at 1 rev/sec.
    2m/s

    2) A 10,000N vehicle is stalled 1/4 the way across a bridge. What are the two additional recation forces that are supplied at the supprot of both ends of the bridge?
    2,500 and 7,5000N
     
  2. jcsd
  3. Nov 2, 2004 #2
    You must change the 1 rev/sec into rad per sec

    1 rev = 2*pi rad
     
  4. Nov 2, 2004 #3
    The second one looks good, but I think you accidentally wrote an extra zero on the 7,500 N :)
     
  5. Nov 2, 2004 #4
    alright

    V= R * angular speed?

    Radius:
    C=pi*d
    2meters=3.14*d
    .6366=d
    d=2r
    .6366=2r
    Radius=.318meters

    angular speed= 6.283185308 radians * ???? is it 2meters?
     
  6. Nov 2, 2004 #5

    Doc Al

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    Staff: Mentor

    The cirumference is given, not the radius. So 2m/s is correct.
     
  7. Nov 2, 2004 #6
    oh, didn't pay close enough attention...sorry for any confusion aneima6!
     
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