Homework Help: physics

Posted by jamie on Tuesday, December 9, 2008 at 4:26am.

A ball of mass m = 500g moves around a vertical axis with an angular speed ù. It is attached to two strings of length: the upper a = 30 cm and the lower b = 40 cm.Both strings are taut and perpendicular to each other. Each of the strings beaks if the tension exceeds 12.6 N. Which of the strings will break first and for what value of ù?

Can someone please direct me with this problem also, Im lost once again.

physics - bobpursley, Tuesday, December 9, 2008 at 7:47am
Centripetal force is w^2*m*radius
you need to calculate the radius from the dimensions.

Now, the component of force in each string can be found

tension upper= w^2 *r * m * sintheta where theta is the upper angle of the string triangle, or sintheta= 4/5
tension lower you do it.

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