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P. 4288. A spring of length , is hang and when an object is attached to it, its length changes to 2. (The extension of the spring is proportional to the force and its mass is negligible.) When the object, attached to the spring, undergoes uniform circular motion along a horizontal path, the length of the spring is L What are the radius of the circle and the angular speed of the object?

(4 points)

Deadline expired on 10 December 2010.

Google Translation (Sorry, the solution is published in Hungarian only.)

Megoldás. A szögsebesség $\displaystyle \sqrt{\left(\frac{1}{\ell}-\frac{1}{L}\right)g}$, a körpálya sugara pedig $\displaystyle \frac{L}{L-\ell}\sqrt{L(L-2\ell)}.$

Statistics on problem P. 4288.
 131 students sent a solution. 4 points: 55 students. 3 points: 13 students. 2 points: 25 students. 1 point: 18 students. 0 point: 15 students. Unfair, not evaluated: 5 solutions.

• Problems in Physics of KöMaL, November 2010

•  Támogatóink: Morgan Stanley