3 years ago

Which of the following is true of work?

Physics

1 answer:

FinnZ [79.3K]3 years ago

3 0

Answer:

Explanation:

C: Force and Weight are related. This is not the answer.

B: Not true Much as we might feel this way after working, it is not the answer either. Not in Physics at least.

D: is treated the same way as B.

A: is the actual answer in physics. How you feel has nothing to do with it. Work is some Force moving a distance. Both are needed.

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We can solve the problem and find the correct option using the Law of Cosine.

Let A and B, the given two sides and R the resultant (sum),

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So, using the law of cosines, we have:

$R^{2}=A^{2}+B^{2}+2ABCos(\alpha)\\ \\A^{2}=A^{2}+A^{2}+2*A*A*Cos(\alpha)\\\\0=A^{2}+2*A^{2}*Cos(\alpha)\\\\Cos(\alpha)=-\frac{A^{2}}{2*A^{2}}=-\frac{1}{2}\\\\\alpha =Cos(-\frac{1}{2})^{-1}=120\°$

Hence, we have that the angle between the vectors is 120°. The correct option is C) The angle between the vectors is 120°

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