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: Physics - Circular motion questionplease help me

  1. Apr 5, 2005 #1
    Physics - Circular motion question..please help me..:(

    A ball of mass 0.50kg is swung in a circle of radius 2.0m with a period of 1.5s.

    a.) what is the speed of the ball?

    b.) what is the acceleration of the Ball?

    C.) What centripetal force must be exerted by the string that keeps the ball in orbit?

    d.) what is the mass of the central object?

    e.) What angle does the string make with the veritical?

    f.) how long is the strong, L?

    Thanks so much if u can help...it would be good to show me the explanation and the formulas used as well...thanks a bunch!
  2. jcsd
  3. Apr 6, 2005 #2
    a) 8.378m/s
    b) 35.095 m/s^2
    c) 17.548N
    d) 1.79kg
    e) 0?
    f) 2m?
  4. Apr 6, 2005 #3
    ooh! thanks alot, i did those questions earlier..
    for 8 however, i got 1.85 kg.
    For e.), i got 74 degrees...for this one just did the pythagoreum thereom, since one angle is 90 degrees, and in d.) we found the other angle being 16 degrees..
    but yah, thanks so much!
  5. Apr 6, 2005 #4
    I dont know how you got 1.85kg, if you got c, just divide that by the acceleration (9.8) As for e and f, I have no clue what it wants @.@
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook