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Homework Help: Centripetal acceleration/ motion question

  1. Jan 22, 2012 #1
    I am trying to calculate the speed of an object at the point that it flys off the half circle ramp, and I was wondering if it would be correct to use the formula v2=v20+2aΔx to calculate the final velocity of the object as it exits the half circle thing.
     

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  3. Jan 22, 2012 #2

    tiny-tim

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    welcome to pf!

    hi chudzoi! welcome to pf! :smile:

    (what does centripetal acceleration have to do with this? :confused:)
    that's a linear acceleration formula, isnt it?

    hint: always check first whether you can use a conservation equation :wink:
     
  4. Jan 22, 2012 #3
    I honestly have no idea what your hint means :tongue:
    Can you explain further about what formula I'm supposed to use?
     
  5. Jan 22, 2012 #4

    tiny-tim

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    do you know any equations called "conservation of (something)"? :smile:

    (i may have gone to bed by the time you answer :zzz:)
     
  6. Jan 22, 2012 #5
    Well I know conservation of momentum, but I don't know how it would apply to my question.
     
  7. Jan 22, 2012 #6

    tiny-tim

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    aha!

    you'll need to look up conservation of energy :smile:
     
  8. Jan 22, 2012 #7
    Is that the formula with 1/2 mv2 and mgh in it? I looked it up and it came up with stuff like Δ(U+K) = 0 and U + K = E which don't look familiar to me at all. I'm in Grade 12 right now, so should I have learned it?
     
  9. Jan 22, 2012 #8
    yeah that's what you'll be wanting to use for this problem, it's the same idea as conservation of momentum: initial = final
     
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