Homework Help: physics

Posted by pop on Monday, April 5, 2010 at 10:09am.

A light string has its ends tied to two walls separated by a distance equal to five-eighths the length of the string. A 53 kg mass is suspended from the center of the string, applying a tension in the string.

What is the tension in the two strings of length L/2 tied to the wall? The acceleration of gravity is 9.8 m/s^2.
Answer in units of N.

physics - bobpursley, Monday, April 5, 2010 at 10:48am
Draw the triangles.

half the weight is supported by each side.

Let theta be the angle from the wall horizontal to the string. Then on each side, SinTheta=Weight/(2*tension)

But tan cosTheta= half wall distance/halfstring distance
costheta= 5/8

But sin^2theta+cos^2theta=1
or weight^2/4Tension^2+25/64=1
solve for tension.

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