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Homework Help: Tension in an object moving with circular motion

  1. Sep 20, 2016 #1
    1. The problem statement, all variables and given/known data
    An object of mass 0.8kg is whirled round in a horizontal circle of radius 2m with a constant speed of 15ms-1. Calculate the tension in the string.

    3. The attempt at a solution
    So far I have calculated that the angular velocity is 7.5rads-1, the frequency is 1.19Hz and the time period is 0.84s, I'm just not sure where to go from here.
  2. jcsd
  3. Sep 20, 2016 #2


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    Science Advisor

    Where did the relevant equations section go?
    You didn't need to find angular velocity, frequency or period.
    There is a single equation you can use to find tension from the given variables.
  4. Sep 20, 2016 #3
    Have you drawn a free body diagram? Do you know an equation for calculating the acceleration of the object?
  5. Sep 20, 2016 #4
    Looks like you have everything you need in terms of variables
    See if there is an equation that can use these variables to calculate centripetal acceleration
  6. Sep 20, 2016 #5
    Draw the FBD and analyse the forces acting on the body.

    Then frame an eqn. of horizontal and vertical eqbm.
    U can get the required ans
  7. Sep 21, 2016 #6
    Thank you very much for the help everyone!
  8. Dec 13, 2016 #7
    Plz i nid formula to dat first question
  9. Dec 13, 2016 #8
    What are your thoughts on this so far? Can you say in words what is happening physically in this problem?
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