Physics

posted by Physics: Circular Motion?

A ball (m = 250g) on the end of
string swings in 1.2 m radius that tolerates 20 N. At what speed does the string breaks if
a) the rings swings horizontally ?
b) the rings swing vertically?

I think I got a) right:
T=mv2/r ---> v=(sqr)Tr/m

v=(sqr) 20x1.2/0.25= 9.8 m/s

Given answers are: 9.8 m/s and 9.2 m/s

Can someone help me how to find maximum speed when the rings swings vertically please ? :)

  1. Damon

    Max force at bottom = 20 = m v^2/r + m g

    20/.25 = v^2/1.2 + 9.81

    v^2 = 70.19 *1.2 = 84.2

    v = 9.17 m/s

Respond to this Question

First Name

Your Answer

Similar Questions

  1. PHYSICS!!

    A ball on the end of a string is whirled around in a horizontal circle of radius 0.386 m. The plane of the circle is 1.10 m above the ground. The string breaks and the ball lands 2.00 m (horizontally) away from the point on the ground …
  2. Physics

    A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.77 m. With the string hanging vertically, the object is given an initial velocity of 1.8 m/s parallel …
  3. Physics

    A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.88 m. With the string hanging vertically, the object is given an initial velocity of 1.7 m/s parallel …
  4. Physics

    A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.88 m. With the string hanging vertically, the object is given an initial velocity of 1.7 m/s parallel …
  5. Physics - repost

    A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.88 m. With the string hanging vertically, the object is given an initial velocity of 1.7 m/s parallel …
  6. physics

    A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.73 m. With the string hanging vertically, the object is given an initial velocity of 2.0 m/s parallel …
  7. physics

    A pendulum consists of a small object hanging from the ceiling at the end of a string of negligible mass. The string has a length of 0.80 m. With the string hanging vertically, the object is given an initial velocity of 2.6 m/s parallel …
  8. physics

    a pendilum consists ofa small object hanging from the ceiling at the end of the string of negligible mass. the string has length of 0.7m. with the string hanging vertically,the object is given an initial velocity of 2.0m/s parallel …
  9. Physics

    A ball on the end of a string is whirled around in a horizontal circle of radius 0.300m. The plane of the circle is 1.19m above the ground. The string breaks and the ball lands 1.91m (horizontally) away from the point on the ground …
  10. Physics

    A ball of mass m 0.285 kg swings in a vertical circular path on a string L = 0.810 m long as in the figure below. a) If its speed is 5.25 m/s at the top of the circle, what is the tension in the string there?

More Similar Questions