Abag of cement weighing 325 n hangs in equilibrium from three wires. two of the wires make angles of theta1=60.0 degrees and theta2=40.0 degrees with the horizontal. assuming the system is in equilibrium, find the tensions of t1, t2, and t3.

The sketch of the system is: two strings, 1 and 2, are attached to the ceiling and to a third string, 3.The third string holds the bag of cement. 

The free body diagram of the weight with the string 3, drives to the tension T3 = weihgt => T3 = 325 N

The other free body diagram is around the joint of the three strings.

In this case, you can do the horizontal forces equilibrium equation as:

T1* cos(60) - T2*cos(40) = 0

And the vertical forces equilibrium equation:

Ti sin(60) + T2 sin(40) = T3 = 325 N

Then you have two equations with two unknown variables, T1 and T2

0.5 T1 - 0.766 T2 = 0

 0.866 T1 + 0.643T2 = 325

When you solve it you get, T1 = 252.8 N and T2 = 165 N

T1 = 252.8 N, T2 = 165N, and T3 = 325N

 

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