1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

Need Engineering Help

Discussion in 'Off-Topic Discussion' started by mar_ga_rita, May 20, 2009.

  1. mar_ga_rita

    mar_ga_rita [OP] Head of the MASTERS CIRCLE

    Joined:
    Jan 29, 2009
    Member:
    #13069
    Messages:
    363
    Gender:
    Male
    New Orleans
    Vehicle:
    2003 Tacoma SR5 PreRunner TRD
    BUG SHIELD BULL BAR OFF-ROAD LIGHTS 4-RUNNER FOG LIGHT SWITCH K&N EYE OF THE TIGER ON THE BACK GLASS TONNEAU COVER
    Well it has been a long time since I have taken a class going over this and am looking for a little help. I am trying to find the tension in each cable. My cousin was asking me about it and I just can't remember for anything. Each Circle is a Pulley.
    [​IMG]
     
  2. mar_ga_rita

    mar_ga_rita [OP] Head of the MASTERS CIRCLE

    Joined:
    Jan 29, 2009
    Member:
    #13069
    Messages:
    363
    Gender:
    Male
    New Orleans
    Vehicle:
    2003 Tacoma SR5 PreRunner TRD
    BUG SHIELD BULL BAR OFF-ROAD LIGHTS 4-RUNNER FOG LIGHT SWITCH K&N EYE OF THE TIGER ON THE BACK GLASS TONNEAU COVER
    I know someone on here must know something about engineering... if nothing else I am going to see if I can dust off some of my old books and flip thru them.
     
  3. mjp2

    mjp2 The Lost Mod of Akalabeth Staff Member

    Joined:
    Feb 16, 2007
    Member:
    #924
    Messages:
    17,278
    Gender:
    Male
    First Name:
    Milton Juevos Portimous II
    NJ
    Vehicle:
    '06 TRD Access Cab, v6, 6-speed
    Scaffolding and a painted grill
    I usually do better with multiple choice.
     
  4. MyToyTaco

    MyToyTaco ╒╪╕

    Joined:
    Sep 23, 2008
    Member:
    #9417
    Messages:
    4,308
    Gender:
    Male
    First Name:
    Nick
    Port Hueneme
    Vehicle:
    08 Taco
  5. tcBob

    tcBob Gringo Bandito Staff Member

    Joined:
    Sep 6, 2006
    Member:
    #1
    Messages:
    7,806
    Gender:
    Male
    First Name:
    Bob
    SoCal
    Vehicle:
    07 PreRunner SR5 V6 Black
    they're probably at work right now...might get some responses tonite
     
  6. mar_ga_rita

    mar_ga_rita [OP] Head of the MASTERS CIRCLE

    Joined:
    Jan 29, 2009
    Member:
    #13069
    Messages:
    363
    Gender:
    Male
    New Orleans
    Vehicle:
    2003 Tacoma SR5 PreRunner TRD
    BUG SHIELD BULL BAR OFF-ROAD LIGHTS 4-RUNNER FOG LIGHT SWITCH K&N EYE OF THE TIGER ON THE BACK GLASS TONNEAU COVER
    haha yea I am trying to get some young buck though... figure they are still in classes
     
  7. trtripoli

    trtripoli lower management

    Joined:
    Aug 1, 2008
    Member:
    #8266
    Messages:
    341
    Gender:
    Male
    Denver, CO
    Vehicle:
    07 4,0 L, 6M, Dbl Cab, TRD Off Road
    Eclipse AVN6620 JL 500/1 amp JL 13TW5 sub JL 300/4 JL XR-650CSi Mr Marv Box Blu tooth XM radio Back Up camera, RAAMmat and Ensolite everywhere but ceiling
    I know this is a statics problem, so all the forces are equal. The lengths of the ropes don't really matter since they are considered weightless.

    Tension of Cable 3 (L3) is just the weight.
    Ft3=60lbs.

    Tension of Cable 2 (L2) is done by setting up a right triangle to get the tension force at that angle. So Cos(180-theta1)=Wt/Ft2==>Ft2=60/Cos(42.4deg)=81.25lbs tension for Length 2.
    Ft2=81.25lbs

    Tension in cable 3 is still 60 lbs down, and found by using the theta2 and using it to get another right triangle with cable 3 to get equilibrium (I think). cos(15.6)=60/Ft1==>Ft1=60/cos(15.6)=62.29lbs
    Ft1=62.29lbs

    (It's been 6 years since I've had this class, so better double check the answer)
     
  8. FlawedXJ

    FlawedXJ mall crawlin', web wheelin', concrete cowboy

    Joined:
    Oct 28, 2008
    Member:
    #10334
    Messages:
    6,091
    Gender:
    Male
    First Name:
    Paul
    NorAla
    Vehicle:
    13 F150 FX4, 99 jeep xj.
    I actually have a jeep now. Imagine that.
    summation of the forces. Find all the forces in the x and y direction, equate and set each equal to zero.
     
  9. FlawedXJ

    FlawedXJ mall crawlin', web wheelin', concrete cowboy

    Joined:
    Oct 28, 2008
    Member:
    #10334
    Messages:
    6,091
    Gender:
    Male
    First Name:
    Paul
    NorAla
    Vehicle:
    13 F150 FX4, 99 jeep xj.
    I actually have a jeep now. Imagine that.
    my bad, i thought they said t1, t2, t3. not lengths.
     
  10. trtripoli

    trtripoli lower management

    Joined:
    Aug 1, 2008
    Member:
    #8266
    Messages:
    341
    Gender:
    Male
    Denver, CO
    Vehicle:
    07 4,0 L, 6M, Dbl Cab, TRD Off Road
    Eclipse AVN6620 JL 500/1 amp JL 13TW5 sub JL 300/4 JL XR-650CSi Mr Marv Box Blu tooth XM radio Back Up camera, RAAMmat and Ensolite everywhere but ceiling

    Thats right, hopefully I did it correctly above.
     
  11. mar_ga_rita

    mar_ga_rita [OP] Head of the MASTERS CIRCLE

    Joined:
    Jan 29, 2009
    Member:
    #13069
    Messages:
    363
    Gender:
    Male
    New Orleans
    Vehicle:
    2003 Tacoma SR5 PreRunner TRD
    BUG SHIELD BULL BAR OFF-ROAD LIGHTS 4-RUNNER FOG LIGHT SWITCH K&N EYE OF THE TIGER ON THE BACK GLASS TONNEAU COVER
    That seems correct... It has been so long since I have even worked a statics problem lol
     
  12. epa4wd

    epa4wd Well-Known Member

    Joined:
    Mar 17, 2009
    Member:
    #14828
    Messages:
    2,052
    Gender:
    Male
    First Name:
    Eduardo
    Vehicle:
    2015 TRD Sport 2WD
    Clazzio Seat Covers Extang Tri-Fold Soft Tonneau Cover TRD Skid Plate Side Steps 43% Front Tint Pop and Lock TRD Exhaust
    If the pulleys are frictionless, the tension is the same trough the whole cable.
     
  13. pittim

    pittim Play stupid games, win stupid prizes

    Joined:
    May 28, 2008
    Member:
    #6939
    Messages:
    10,702
    Gender:
    Male
    First Name:
    Tim
    IN, PA
    Vehicle:
    Dented and rusty
    Pink slider.
    I took statics last semester so I should know how to do this.

    Unfortunately I slept thru half of my classes, so I don't know how to do this.
     
  14. trtripoli

    trtripoli lower management

    Joined:
    Aug 1, 2008
    Member:
    #8266
    Messages:
    341
    Gender:
    Male
    Denver, CO
    Vehicle:
    07 4,0 L, 6M, Dbl Cab, TRD Off Road
    Eclipse AVN6620 JL 500/1 amp JL 13TW5 sub JL 300/4 JL XR-650CSi Mr Marv Box Blu tooth XM radio Back Up camera, RAAMmat and Ensolite everywhere but ceiling
    I didn't know how to do statics til I got threw dynmaics.
     
  15. pittim

    pittim Play stupid games, win stupid prizes

    Joined:
    May 28, 2008
    Member:
    #6939
    Messages:
    10,702
    Gender:
    Male
    First Name:
    Tim
    IN, PA
    Vehicle:
    Dented and rusty
    Pink slider.
    yeah, all I know is EF=0 and EM=0.

    How you get to that I have noooooooooooo idea haha.
     
  16. jdkeller

    jdkeller How many words can be fit in this s

    Joined:
    Nov 26, 2008
    Member:
    #11040
    Messages:
    13,034
    Gender:
    Male
    First Name:
    Jonathan
    Inland Empire, Ca
    Vehicle:
    2008 Tacoma Prerunner TRD Offroad
    Dome light LED, 6000k HID Headlights and fogs, Grillcraft black mesh, rear 5100's, Total Chaos UCA's, 285/75/16 BFG KM2's, Spidertrax spacers, Blacked out emblems, cb,kenwood tm270 ham radio, All Pro 3" leaf pack, Fox 2.0 coilovers, Revenge Fab Sliders, u bolt flip kit, Pioneer avh4200, bed bar with light and antenna, Wet Okoles, Weathertech Mats, Wet Okole Armrests, Rear KR Fab bumper, bed mat, N-Fab spare tire carrier with full size spare on 16" TRD rim, Bedlinered flares and grille. Camburg Spindles, All Pro front fenders.
    haha I take statics next quarter. At my school its an 80% fail rate :eek:
     
  17. epa4wd

    epa4wd Well-Known Member

    Joined:
    Mar 17, 2009
    Member:
    #14828
    Messages:
    2,052
    Gender:
    Male
    First Name:
    Eduardo
    Vehicle:
    2015 TRD Sport 2WD
    Clazzio Seat Covers Extang Tri-Fold Soft Tonneau Cover TRD Skid Plate Side Steps 43% Front Tint Pop and Lock TRD Exhaust
    I still say its the same tension ( L1=L2=L3 ) those are fixed pulleys, frictionless with a cable with negligible mass.
     
  18. pittim

    pittim Play stupid games, win stupid prizes

    Joined:
    May 28, 2008
    Member:
    #6939
    Messages:
    10,702
    Gender:
    Male
    First Name:
    Tim
    IN, PA
    Vehicle:
    Dented and rusty
    Pink slider.
    Have fun! :rofl:

    I took it twice. First time was with this teacher that gave really fucking complicated problems and couldn't teach for shit. I dropped the class immediately after taking the 2nd test (literally, once I got back to my room I dropped it haha.) I picked up a different teacher for my send hack at the class. At least 60% of the class was people that had the guy I had for my first whack at the class.
     
  19. EEtaco

    EEtaco Well-Known Member

    Joined:
    Feb 22, 2009
    Member:
    #13917
    Messages:
    245
    Gender:
    Male
    First Name:
    Stefan
    Mississippi
    Vehicle:
    09 V6 Prerunner
    5100's @1.75
    x2
    Those pulleys are changing direction of force and not multiplying it so T1=T2=T3.
     
  20. lsocoee

    lsocoee My hair is all natural Staff Member

    Joined:
    Feb 9, 2007
    Member:
    #872
    Messages:
    10,094
    First Name:
    Hotdog
    Vehicle:
    2007 PreRunner SR5 Double Cab
    Wet Okole Underwear
    I'm with these guys. Those pulleys have no mechanical advantage so you might as well be lifting that weight straight up. The tension in all the cables is the same.
     
To Top