A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

DominantVampire

  • one year ago

URGENT HELP

  • This Question is Closed
  1. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    a block of mass 12 kg is released from rest om a friction-less incline of the angle theta=30 below the block is a spring having spring constant 10^4 N/m. the block stops momentarily when it compresses the spring by 4 cm. how far does the block move down the incline from its rest position to this stopping point

  2. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    does anybody know

  3. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    @ganeshie8 @Compassionate @mathmate @mathmath333

  4. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    just*

  5. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    i asked this sol. many times but each time the FORMULA is different

  6. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    q*

  7. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    irish boy come to physics department in my Q which you already answered but what youve answered is energy not the distance, please look other solutions too, i am getting diff. ans

  8. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    http://openstudy.com/study#/updates/557d363be4b0e4e582aa702e

  9. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    why urgent?

  10. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    there does seem to be some confusion about this. the first thing you need to do always is to draw it - and yes i could probably do this in my head but i would still always sketch it in outline just to be sure. that not only aids communications between you and others but will help you get the problem clear in your mind and it will also be a place to define variables such as vertical distance and distance along the slope - which are important here. you should do that first using the "Draw" widget that OS provides after that we can work through it.

  11. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    oka

  12. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    |dw:1434455352074:dw|

  13. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    yeah!! |dw:1434455454721:dw| this is what i mean by adding in other data. make sense?

  14. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    yes it does

  15. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    so "frictionless" means no energy lost to friction/heat, yes? that means we are looking at loss of grav potential energy of block which converts to potential energy in spring. simplest way to do it. is that what you are after?

  16. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    yes that's what it mean and that's what i'm after

  17. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    why not makes it easy for now just by calculating the energy in the spring when it is compressed 4cm. just work that out.

  18. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    1/2kx^2?

  19. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    yes

  20. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    oka so this is the first step? 1/2 (10^4)(4)^2

  21. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    mmmm. units? maybe this is where you are going wrong?

  22. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    convert 4 cm into mterers so 0.04 m the ans i get K.E= 8J

  23. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    joule

  24. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    |dw:1434456031864:dw|

  25. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    i said that

  26. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    8J here too all good so far now that is the grav potential energy the block lost by sliding down the slope. we need now calc h -- see the diagram. know how to?

  27. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    U= mgh ? perhaps the P.E

  28. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    i dont know, sighs, thats where i get confused perhaps we use energy conservation formula

  29. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    looks good. do the sums and we can compare results. do you use g = 10 or 9.8?

  30. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    9.8 to be exact

  31. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    how to find h? where U= mgh U is??

  32. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    we might resolve into its components ?

  33. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    mgh sin theta

  34. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    look at diagram where i marked "h" in. that is what we want. make sense? mgh = 8J

  35. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    oh so U=K i see (12)(9.8)h= 8 so h is 0.06 m

  36. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    check your calculator: 0.06 m ? i get 0.068 which is closer to 0.07.

  37. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    yes yes it was

  38. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    |dw:1434456513348:dw| so this is where we are, and another litle sketch to make sure we understand what is happening do you agree with this?

  39. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    yes it right

  40. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    and question asks: "how far does the block move down the incline from its rest position to this stopping point " do you see it? what is the answer?

  41. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    mmm no, i dont. im sorry

  42. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    the answer is h?

  43. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    |dw:1434456741787:dw| to lose 8J of PE, the block had to fall 0.068m vertically. that involved travelling distance d down the slope. so this now becomes a simple trig problem....

  44. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    do you know trigonometry? sin, cos, tan and the rest?

  45. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    oh yes im sorry

  46. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    you have the opposite, you want the hypoteneuse, sohcahtoa....

  47. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    we're close, are you still there or wanna finish later?

  48. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    im sorry there was a power cut

  49. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    well, fire away. use trig and get d from h = 0.068 and angle = 30degrees

  50. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    it would be dsin30=h so 0.07/sin30

  51. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    is it correct

  52. IrishBoy123
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 4

    yes, in cm, d = 13.6cm

  53. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    0.136 m

  54. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    i saw this ans. somewhere else too, let me show you, please do visit

  55. DominantVampire
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    @IrishBoy123 thankyou so so much

  56. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

Your question is ready. Sign up for free to start getting answers.

spraguer (Moderator)
5 → View Detailed Profile

is replying to Can someone tell me what button the professor is hitting...

23

  • Teamwork 19 Teammate
  • Problem Solving 19 Hero
  • You have blocked this person.
  • ✔ You're a fan Checking fan status...

Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.