1. PF Contest - Win "Conquering the Physics GRE" book! Click Here to Enter
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Simple bucket lifting problem statics/physics

  1. Oct 2, 2014 #1
    1. The problem statement, all variables and given/known data

    A worker is trying to lift a 100lb bucket. Assume that the bucket is in static equilibrium as it is raised from 2ft to 18ft. Find the tension in the rope as a function of y.

    2. Relevant equations

    3. The attempt at a solution
    I solved for angle, a, which cam out to be: arctan(4/(20-y))

    Then I solved for the x and y components of the tension vector using: T_x=50lb(a+90) and T_y=50lb(a+90)
    I divided the weight by 2 because there are 2 ropes

    Then I solved for tension with: sqrt(T_x^2+T_y^2)

    The problem I am seeing is that the tension is constant at 30lb no matter the angle, a. I do not think that this should be the case. Could somebody point out where I went wrong? Thank you!

    Attached Files:

  2. jcsd
  3. Oct 2, 2014 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member

    T_y=50lb(a+90) is wrong. Have another think.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Threads - Simple bucket lifting Date
Simple MOSFET Driver Circuit Tuesday at 2:02 AM
Rotary motion to lift a dump truck Feb 28, 2018
Simple Equivalence Problem- help please (First Year Statics) Feb 16, 2018
Simple gear train, typo? Dec 18, 2017