Why Is Cosine Used Instead of Sine in Calculating Tension in Physics?

AI Thread Summary
In calculating tension in physics, cosine is used instead of sine due to the relationship between the angles in right triangles. In this scenario, the angle between the rope and the horizontal is 30 degrees, making the angle with the vertical 60 degrees. Since the tension's vertical component corresponds to the adjacent side of the triangle, cosine is appropriate to use, as cos 60 equals sin 30. This choice simplifies calculations while maintaining accuracy. Understanding the relationship between sine and cosine in right triangles is crucial for solving such problems effectively.
-EquinoX-
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because the angle created by the rope holding the block and the slanted thinger is 30 degrees (right triangles). So instead of putting sin 30 they just put cos 60 because sin 30 = cos 60. i hope you understand what I'm talking about
 
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