two forces of magnitude 100n and 70n act on an object. the angle between the forces is 120 degrees. what is the resultant force?
1 answer:
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Answer:
The Pythagorean identity states that
Using that we can rewrite the left denominator as:
Which can be factored as
The numerator we can expand as:
On the right hand side, let's multply numerator and denominator with (1 - sin t):
The total formula then becomes:
There you go... left and right are equal.
