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: Mechanics problem, need some help

  1. Sep 18, 2005 #1
    A weight with a mass of 3 kg is attached to a string of length 50 cm. One end of the string is fixed at the origin (x=0, y =0) and the weight is pushed on a frictionless table top so that it moves horizontally in a circle with constant angular velocity %omega. The weight moves in the x-y plane, z=0. At a certain time the velocity of the mass is vx = -3m/s , vy = 2m/s.

    The total force is 54i +24j [N] (Not a given, calculated)

    The question is:

    At the instant the velocity is as above the string is cut. Where is the mass 4 seconds later? Ignore the effects of gravity and friction.

    I really need some help with this one.. Thanks alot
    Last edited: Sep 18, 2005
  2. jcsd
  3. Sep 18, 2005 #2
    when cut the body is moving at -3m/s in the X
    and 2m/s in the Y
    will the direction or magnitude of any of these change after the string is cut?
    what happens 4s later then? What is the displacement from the original position
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook