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Centripital Circular Motion

  • #1

Homework Statement



17. A 100 g bead is free to slide along an 80 cm long piece
of string ABC. The ends of the string are attached to a
vertical pole at A and C, which are 40 cm apart. When
the pole is rotated about its axis, AB becomes
horizontal.
a. Find the tension in the string.
b. Find the speed of the bead at B.

Homework Equations



F=ma
a=v^2/r

The Attempt at a Solution



Using X^2 + (40)^2 = (80 - x )^2, I got 30 and 50 for the lengths of the two parts of the string. Now Im stuck on how to break the Forces into x and y components.
 

Answers and Replies

  • #2
Greetings and welcome! Think about all of the forces on the point B. There's horizontal tension, there's tension up-and-to-the-side, and there's the force of gravity on the bead. Break these forces into their horizontal and vertical components by finding the angle made at point B.
 
  • #3
Ok, so... All the forces acting on the system are: gravitational force, tension in the 2 strings, which can be broken into their horizontal and vertical components. Theres normal force, right?
 

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