1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    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!

Homework Help: Work and Tension Problem

  1. Apr 17, 2008 #1
    Two ropes are used to lower a 255kg piano 5.0m from a second-story window to the ground. How much work is done by each of the 3 forces? T1 is 1830 N with angle of 60∘pointing to the upper left, T2 is 1295N and has angle of 45∘and pointing to the upper right corner. The w is pointing downwards with a force of 2500N.

    The answers are: T1= -7920J and T2 = -4580J

    I understand how to find the work for the downward force, it is 12500J, but i`m not certain about the other two tensions. Please help if you can!

    My calculation for T1 was:
    T1 = -12500J + [(1830N cos 60)(5.0m)]
    = -7925 J
    Last edited: Apr 17, 2008
  2. jcsd
  3. Apr 17, 2008 #2
    Just use th same. Work=Integral(F.dx) where dx is the interval you're moving. If the force is constant, then Work=F*x. Just split the forces in x and in y and calculate the work in each direction for each of the forces you want. Good luck!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook