1. Not finding help here? Sign up for a free 30min 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!

Torque with pulleys and bucket of water

  1. Oct 31, 2006 #1
    Imagine a frictionless pulley (a solid cylinder) of unknown mass M and radius r = 0.41 m is used to draw water from a well. A bucket of mass m = 1.53 kg is attached to a cord wrapped around the cylinder. A bucket starts from rest at the top of the well and falls for t = 2.04 s before hitting the water h = 2.87 m below the top of the well. Neglect the mass of the cord.

    t = F*R
    t=(1.53*9.81) * .41

    t = 6.15 Nm??
     
  2. jcsd
  3. Oct 31, 2006 #2

    Doc Al

    User Avatar

    Staff: Mentor

    What's the question? (Find the unknown mass of the pulley?)

    Hint: What directly exerts the torque on the cylinder is the tension in the rope, not the weight of the bucket.
     
  4. Oct 31, 2006 #3
    sorry, the question is asking what the torque is; i cant seem to figure it out for some reason?
     
  5. Oct 31, 2006 #4

    Doc Al

    User Avatar

    Staff: Mentor

    Find the tension in the rope.

    Hints: Analyze the forces acting on the bucket. Apply Newton's 2nd law. (What's the acceleration of the bucket?)
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Torque with pulleys and bucket of water
  1. Water Bucket problem (Replies: 3)

Loading...