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Who's good at Physics?

Discussion in 'Off-Topic Discussion' started by dually, Nov 17, 2008.

  1. Nov 17, 2008 at 5:52 PM
    #1
    dually

    dually [OP] Low and slow

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    Just wondering who can answer some AP Physics questions? This class sucks unbelievably bad.
     
  2. Nov 17, 2008 at 5:55 PM
    #2
    Dilsky

    Dilsky There go my nipples again!

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    I took some physics in High Scool and University.....What kind of questions? toss them out there and I am sure you will get some answers!
     
  3. Nov 17, 2008 at 5:57 PM
    #3
    dually

    dually [OP] Low and slow

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    I have an answer, just wondering what you guys get:

    You push a 45kg wooden crate up a ramp that makes an angle of 22deg to the horizontal at a constant speed. The coefficient of kinetic friction for the crate and ramp is .385. (a) How much work have you done if you push it a distance of 10.5m up the ramp? (b)What is the potential energy for the crate relative to the base of the ramp?
     
  4. Nov 17, 2008 at 6:11 PM
    #4
    pittim

    pittim mittip

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    I got b to be 1734.62 N.
     
  5. Nov 17, 2008 at 6:14 PM
    #5
    NumNutz

    NumNutz One of the original 7928

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    Lots.
    +1 i love ap physics!!!!!
     
  6. Nov 17, 2008 at 6:17 PM
    #6
    pittim

    pittim mittip

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    Yeah, the campus that I'm at has a SHIT physics program. It's called Scale Up. DO NOT GO TO ANY SCHOOL THAT HAS THAT AS THEIR PROGRAM!

    Let me explain why it sucks:

    You're never taught physics. Really. It's do worksheets and try and figure it out, while the people who run the course say "draw a FBD" and then they expect that to make it easier.
     
  7. Nov 17, 2008 at 6:18 PM
    #7
    dually

    dually [OP] Low and slow

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    Work is in Joules....

    Here is my work for (A) F=< coefficient of friction x force of normal

    Fn=sin22deg(450)x.385
    Force up the ramp = 64.90N??

    W=Fr
    W= 64.90x10.5
    W=681.45J

    This is what I got for A
     
  8. Nov 17, 2008 at 6:30 PM
    #8
    tacomaman06

    tacomaman06 Carolina Alliance: Enforcer

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    damn!!!! glad ya'll can do that shit!!! i hate math.....always have............and anything above fractions.............see ya later!!!:D
     
  9. Nov 17, 2008 at 6:32 PM
    #9
    dually

    dually [OP] Low and slow

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    hahaha im with ya, I thought I would challenge myself this year. Screw that!!! Im done with this shit at semester time haha. I better stick with Turbo calculations, thats about as advanced as I want to go lol
     
  10. Nov 17, 2008 at 6:36 PM
    #10
    Dilsky

    Dilsky There go my nipples again!

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    The force needed to push the crate up the incline the force applied must be:
    F = mg*sin(Q)+Ff = Fg*sin(Q)+Fg*cos(Q)*mu
    = 45*9.81sin(22) + 45*9.81cos(Q)*0.385

    F=323 N

    To calculate work, multiply the the force applied by the distance moved.
    W=F*d=323*10.5

    W=3391 J

    For part b multiply the mass by gravity and height

    45*9.81*10.5sin(22)=1736.4 N
     
  11. Nov 17, 2008 at 6:43 PM
    #11
    RelentlessFab

    RelentlessFab Tacoma offroad armor fabricating beast Vendor

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    Ugh... Cant wait for physics next term:rolleyes:
    good luck with yours.
     
  12. Nov 17, 2008 at 6:45 PM
    #12
    LonghornTaco

    LonghornTaco Can you pass the bailout please?

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    42 :)
     
  13. Nov 17, 2008 at 6:48 PM
    #13
    dually

    dually [OP] Low and slow

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    Dilsky, you are the shit dude!!!! Thanks a bunch! I see what I was doing wrong, I wasnt factoring the x-force! HAHA Rep for you!
     
  14. Nov 17, 2008 at 6:48 PM
    #14
    pittim

    pittim mittip

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    The universal answer to any question ever asked.
     
  15. Nov 17, 2008 at 6:50 PM
    #15
    pittim

    pittim mittip

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    I guess the answer to the first question asked is Dilsky :p
     
  16. Nov 17, 2008 at 6:51 PM
    #16
    Dilsky

    Dilsky There go my nipples again!

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    Haha no problem man, good to see it come in handy somewhere.
     
  17. Nov 17, 2008 at 6:54 PM
    #17
    RoyB

    RoyB Well-Known Member

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    how much work was done? too much work, thats how much.
     
  18. Nov 17, 2008 at 6:56 PM
    #18
    dually

    dually [OP] Low and slow

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    One more!

    Find the angles if the system is at rest.
    [​IMG]
     
  19. Nov 17, 2008 at 6:57 PM
    #19
    HerNameIsLucy

    HerNameIsLucy I miss Lucy. :-(

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    I got "hire someone else to push the damn thing up the ramp"

    Answer is: YOU did NO work.

    problem solved.
     
  20. Nov 17, 2008 at 6:58 PM
    #20
    dually

    dually [OP] Low and slow

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    haha, im using that one on the next exam!:D
     
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