Getting the tension(Static equilibirum)

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AI Thread Summary
To determine the angle of the force exerted at cord C, the problem involves a hanging block with a mass of 850g and a tension of 42N in cord B, which is at a 25-degree angle from the X-axis. The user attempts to apply the sine rule and cosine law but encounters difficulties in calculating the correct angle for cord C. A suggestion is made to start with the sum of the forces for each component to simplify the analysis. The discussion emphasizes the need for a systematic approach to resolve the tension and angles accurately. Properly applying the equilibrium conditions will lead to the correct solution.
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Homework Statement



A system cord is knotted at point 0. Determine the angle of the force exerted at cord c If the mass of the hanging block is A=850g(8.34N) the tension in B=42N (the angle of Cord B is 25 degrees from the X-axis)

The Image: http://tinypic.com/m/5ani0y/3

Homework Equations



a/sinA = b/sinB = c/sinC

The Attempt at a Solution



8.43/sinA = 42/sinB = c/sin65

so to get the value of c I need to use the cosine law w/c gives me the answer of c=34.544

If i substitute this value in getting the value of sinA it will be sinA=(34.544)(8.34)/Sin65 w/c gives me a wrong answer.

Help please
 
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How about starting off with the sum of the forces for each component?
 

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