Physics

posted by .

A 0.20-kg ball on a string is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the string tension is 16 N. Find the tensions in the string when the ball is at twelve o'clock and at the six o'clock positions.

* Physics - bobpursley, Tuesday, October 6, 2009 at 4:52pm

at three oclock, Tension= mv^2/r

then at 12 oclock,
tension= mv^2/r-mg
and at six...
tension= mv^2/r + mg

How do I solve for the r and the v?

  • Physics -

    YOu don't need it.

    you know mv^2/r=16N

  • Physics -

    Just sub some numbers in to make it work. For example... tension/mass (16/.2)=80. So 80 is equal to rv^2. so make v=10 m/s and r =.8 m so everything will work out. It stays the same throughout so you can 'make up' the numbers

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. physics

    A 0.21 kg ball on a string is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the tension is 18 N. (c) Is the tension in the string greater when the ball is at the twelve o'clock position …
  2. Physics

    A 0.20-kg ball on a string is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the string tension is 16 N. Find the tensions in the string when the ball is at twelve o'clock and at the …
  3. physics

    a .20 kg ball on a string is whirled on vertical circle at constant speed. When the ball is at 3:00 position, tension is 16 N. a) is centripetal force acting on ball the same at each point on the circle?
  4. Physics

    A ball having a mass of 4 kg is attached to a string 1 m long and is whirled in a vertical circle at a constant speed of 23 m/s. (a) Determine the tension in the string when the ball is at the top of the circle. (b) Determine the tension …
  5. Physics

    A ball having a mass of 5 kg is attached to a string 1 m long and is whirled in a vertical circle at a constant speed of 13 m/s. (a) Determine the tension in the string when the ball is at the top of the circle. (b) Determine the tension …
  6. Physics

    A ball having a mass of 5 kg is attached to a string 1 m long and is whirled in a vertical circle at a constant speed of 13 m/s. (a) Determine the tension in the string when the ball is at the top of the circle. (b) Determine the tension …
  7. Physics

    A 0.20-kg ball on a stick is whirled on a vertical circle at a constant speed. When the ball is at the three o'clock position, the stick tension is 16N. Find the tensions in the stick when the ball is at the twelve o'clock and at the …
  8. Physics

    A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed. The ball has a mass m = 0.162 kg and moves at v = 4.73 m/s. The circular path has a radius of R = 0.87 m 1)What is the magnitude of …
  9. Physics

    A tennis ball connected to a string is spun around in a vertical, circular path at a uniform speed. The ball has a mass m = 0.162 kg and moves at v = 4.73 m/s. The circular path has a radius of R = 0.87 m 1)What is the magnitude of …
  10. Physics

    A 0.20kg ball on a string is whirled on a vertical circle at a constant speed.When the ball is at 3 o'clock position, the string tension is 20N.Find the tensions in the string when the ball is at 12 o'clock and 6 o'clock positions

More Similar Questions