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YumYum247

  • one year ago

Someone help me please!!!!!! :")

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  1. YumYum247
    • one year ago
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    I need help with question 25, a,b,c

  2. YumYum247
    • one year ago
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    What does it mean by "coupling"?!?!??!?!?

  3. YumYum247
    • one year ago
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    @peachpi

  4. YumYum247
    • one year ago
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    do you want me to upload my work?????? i've tried to do the question but idk if it's even right tho :(

  5. YumYum247
    • one year ago
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    @dan815

  6. YumYum247
    • one year ago
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  7. YumYum247
    • one year ago
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  8. pooja195
    • one year ago
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    @nincompoop @TheSmartOne

  9. pooja195
    • one year ago
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    @Zale101

  10. YumYum247
    • one year ago
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    @welshfella Please help me!!!! :")

  11. YumYum247
    • one year ago
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    @peachpi Can you please help me?!!?!!!

  12. YumYum247
    • one year ago
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    Thank you peachpi, my throat is all dried up from writing out loud to people for help...:"(

  13. YumYum247
    • one year ago
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    and Welsshfella!! :")

  14. welshfella
    • one year ago
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    my physics is pretty rusty i'm afraid..

  15. anonymous
    • one year ago
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    seriously, I have no confidence in this. It's a wild shot in the dark. I'm thinking for a) you need to account for the mass of all 15 cars and for b) only the last 8|dw:1442519089103:dw|

  16. YumYum247
    • one year ago
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    that's what i did....but i'm not too sure either.....and Welfella....Thank you for even attempting to help me. :")

  17. welshfella
    • one year ago
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    you use Newton's second law of course F = ma and the third law? which deals with equal and opposite reactions

  18. YumYum247
    • one year ago
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    So this is what i did, first i multiplied the total mass of the 15cars = 96000Kg by the acceleration to get the net force of the train pushing on the buggies. (19,200N)

  19. welshfella
    • one year ago
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    the coupling is the connection between the engine and the first car and also between all the 15 cars. It will be a rigid bar which will be in tension.

  20. welshfella
    • one year ago
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    |dw:1442519725559:dw|

  21. YumYum247
    • one year ago
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    To find the force on the "coupling" between car number 8 and 9. first i counted how many cars number 8 is from 15 which is 8...i think...i multiplied the mass of all 8 cars by the acceleration and then counted the mass of all the cars from 9 to 15 and multiplied their mass by ht acceleration and subtracted the net force from 8 to 9 to get the net force between cars 8 and 9.

  22. welshfella
    • one year ago
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    the above is a simple case with one engine and one car

  23. YumYum247
    • one year ago
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    yes @welshfella did you see the resolution of the questions i uploaded?!?!?!?!?

  24. welshfella
    • one year ago
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    the tension in the coupling can be found by Newtons 2nd law T = m * a = 6400 * 0.2 = 1280 N

  25. welshfella
    • one year ago
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    No i'll take a look

  26. YumYum247
    • one year ago
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    true but have you seen how i attempted to do the next question.....

  27. YumYum247
    • one year ago
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    alright....

  28. welshfella
    • one year ago
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    I'm afraid I cant see it very well with my old eyes!!! lol

  29. YumYum247
    • one year ago
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    Aaawwnnn, try to zoom in...:)

  30. welshfella
    • one year ago
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    you are on the right track, I believe

  31. YumYum247
    • one year ago
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    Ok can you please help me find how far along the track the train must have travelled in 2 minutes after starting??????/

  32. YumYum247
    • one year ago
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    the acceleration of the train is 0.20m/sec^2 and the total mass of the train is 96000Kg, and the net force on the buggies with all the load is 19,200N.

  33. anonymous
    • one year ago
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    You can use the kinematic formula since acceleration is constant \[d=v_0t+\frac{ 1 }{ 2 }at^2\]

  34. YumYum247
    • one year ago
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    but what is the initial velocity of the train tho :"(

  35. anonymous
    • one year ago
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    0, the train is initially at rest

  36. YumYum247
    • one year ago
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    oh....the train is motionless....so Vi = om/sec.

  37. YumYum247
    • one year ago
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    ok just last question.....did i do questu=ion "B" right????

  38. YumYum247
    • one year ago
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    just take a look at the work i've uploaded....

  39. anonymous
    • one year ago
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    it looks right

  40. YumYum247
    • one year ago
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  41. YumYum247
    • one year ago
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    Ok thank you and i LOVE you!!!! :")

  42. anonymous
    • one year ago
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    lol let me know how this turns out.

  43. YumYum247
    • one year ago
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    |dw:1442524560809:dw|

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