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Homework Help: Tangential and normal components

  1. Jan 3, 2006 #1
    a particle A is constrained to move in the circular slot of CD.knowing that t=0 the particle A starts from rest and moves so that its speed increases at a constant rate of 0.8in/s^2.Determine the magnitude of its total acceleration when t=2.pls help....

    thanx.....
     
  2. jcsd
  3. Jan 3, 2006 #2
    ah,miss out smtg about the radius is 3.5in
     
  4. Jan 3, 2006 #3
    i have no idea about it .pls help.....
     
  5. Jan 3, 2006 #4
    the answer is 1.048in
     
  6. Jan 3, 2006 #5

    Hootenanny

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    Do you know how to do it or do you still need help?
     
  7. Jan 3, 2006 #6
    no,i don't know how to do it.those replies are things that i have missed to type
     
  8. Jan 3, 2006 #7

    Doc Al

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    Hints:
    (1) The tangential component is given.
    (2) The radial component is also known as centripetal acceleration.
     
  9. Jan 3, 2006 #8
    i have got acc for tangential=0.8 , but the acc for normal i can't find because i don't know what is the velocity
     
  10. Jan 3, 2006 #9

    Hootenanny

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    Is the acceleration centripital or tangental?
     
  11. Jan 3, 2006 #10
    the centripetal acc i can't find
     
  12. Jan 3, 2006 #11

    Doc Al

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    What's the formula for centripetal acceleration?
     
  13. Jan 3, 2006 #12
    acc(centripetal)=velocity^2 / radius
     
  14. Jan 3, 2006 #13

    Doc Al

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    Good. So figure out the speed at t = 2 secs and you can calculate the centripetal component of the acceleration.
     
  15. Jan 3, 2006 #14
    i still can't figure out
     
  16. Jan 3, 2006 #15

    Doc Al

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    What's the speed at t = 2 seconds? (Hint: the tangential acceleration is constant so it's just uniformly accelerated motion.)
     
  17. Jan 3, 2006 #16
    is it equals to zero??
     
  18. Jan 3, 2006 #17
    oh....is it using the formula v=u + at ??
     
  19. Jan 3, 2006 #18

    Doc Al

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    That's the one.
     
  20. Jan 3, 2006 #19
    but then i got the velocity=1.6 and try to find the centripetal acc and then the total acc and got the wrong answer.did u get the correct answer??
     
  21. Jan 3, 2006 #20

    Doc Al

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    Show your work.

    (FYI: I believe you had a typo in your answer.)
     
    Last edited: Jan 3, 2006
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