Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

micahwood50 Group Title

A 2-kg body rests on frictionless wedge that has an inclination of 60º and an acceleration a to the right such that the mass remains stationary relative to the wedge. Find a.

  • 2 years ago
  • 2 years ago

  • This Question is Closed
  1. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    |dw:1349586481376:dw|

    • 2 years ago
  2. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    didn't we do this already?

    • 2 years ago
  3. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    No, we didn't.

    • 2 years ago
  4. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Still don't understand the force...

    • 2 years ago
  5. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    FBD: |dw:1349586646724:dw| Not sure if it's right, though.

    • 2 years ago
  6. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    |dw:1349586759042:dw|

    • 2 years ago
  7. severus Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    acos60=gcos30 (Balancing forces along the wedge in the reference frame of the wedge)

    • 2 years ago
  8. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    heh

    • 2 years ago
  9. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    |dw:1349587034552:dw|

    • 2 years ago
  10. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    a= gtan60

    • 2 years ago
  11. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    How do you set the equation for y? Not sure if I'm doing it right...\[\Sigma F_y = Nsin60º = ma\]

    • 2 years ago
  12. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    Ncos60 - mg =0

    • 2 years ago
  13. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Hold on, give me time.

    • 2 years ago
  14. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Why Ncos60, not sin?

    • 2 years ago
  15. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    look at the sketch

    • 2 years ago
  16. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    Nsin30 - mg =0 (if you like)

    • 2 years ago
  17. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Yeah, silly me. Got it. Just give me a little more time.

    • 2 years ago
  18. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Can you explain me why Nsin60º = ma?

    • 2 years ago
  19. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    because there are only two forces acting on the mass... N and mg. if you think about it, it's magic otherwise... because if the block is being accelerated it can only be because the ramp is 'pushing' it... ie the Normal force...

    • 2 years ago
  20. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    if the block were somehow accelerated otherwise, it would be some magical force:)

    • 2 years ago
  21. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Now you're making it a little clear. If the wedge was given a greater cceleration, the block will slip upward, right?

    • 2 years ago
  22. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    acceleration*

    • 2 years ago
  23. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    it's like sitting in a car seat when someone stomps on the gas... you feel pushed back but the actuality is that the seat's Normal force has increased and is acting to accelerate you...

    • 2 years ago
  24. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    No.:)

    • 2 years ago
  25. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Why not?

    • 2 years ago
  26. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    N would get longer, but it would still be perp. to the ramp face...

    • 2 years ago
  27. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    you're thinking maybe of a more "real-life" situation wherein air resistance is a factor... then yes, the block would slide up the ramp at some point...

    • 2 years ago
  28. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Now you're mention about air resistance, it does make block slide up. Thanks.

    • 2 years ago
  29. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    hmm actually, maybe you're right about that...

    • 2 years ago
  30. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    because mg is fixed so... if N stays perp. to the ramp face and ma gets longer...I guess N would have a y component larger than mg....

    • 2 years ago
  31. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    Hmm I see. It does make sense.

    • 2 years ago
  32. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    I answered too quickly... sorry :P

    • 2 years ago
  33. micahwood50 Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    It's ok. You helped me a lot. Thanks. I wish I could give you more medals, lol.

    • 2 years ago
  34. Algebraic! Group Title
    Best Response
    You've already chosen the best response.
    Medals 2

    heh.

    • 2 years ago
    • Attachments:

See more questions >>>

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.