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Rolling Question

  • Thread starter Lord Dark
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  • #1
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Homework Statement


Hi again ,, my second one is easy:

A tire 0.5 m in radius rotates at a constant rate of 200 rev/min. Find the speed and
acceleration of a small stone stuck on the surface of the tire (on its outer edge).


Homework Equations





The Attempt at a Solution


the Speed of the rock is easy to get (W=200 rev/min = (20*pi)/3 rad/s = (10*pi)/3 m/s)
about the acceleration : should I get the tangent acceleration or the radial ??
 
Last edited:

Answers and Replies

  • #2
rock.freak667
Homework Helper
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Constant angular velocity means that the angular acceleration is zero. So the tangential acceleration is zero.
 
  • #3
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so the question means i should get the tangent acceleration right not the radial one ?
 
  • #4
rock.freak667
Homework Helper
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31
so the question means i should get the tangent acceleration right not the radial one ?
[tex]a_t = \alpha r [/tex]

[tex]a_r = \frac{v^2}{r}[/tex]


seeing as that [itex]\alpha=0[/itex], which one do you think you should find?
 
  • #5
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[tex]a_t = \alpha r [/tex]

[tex]a_r = \frac{v^2}{r}[/tex]


seeing as that [itex]\alpha=0[/itex], which one do you think you should find?
lol ,, got it :) ,, thanks ,, exam questions are so poor -_-
 

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