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Vika [28.1K]
2 years ago
9

When you raise your arms for a long time and they start to hurt, is that because of gravity pulling on the arm or is it because

your arms are getting tired? I really appreciate this thank you!
Physics
1 answer:
Gemiola [76]2 years ago
7 0
It’s because your arms are getting tired
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Answer:

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Explanation:

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the angle between B and L is given by:

\vec{L}\cdot\vec{B}=LBcos\theta\\\\\theta=cos^{-1}(\frac{\vec{L}\cdot\vec{B}}{LB})=cos^{-1}(\frac{0*0.3y+0.25*0.4y}{0.25*0.5y})=36.86\°

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|\vec{F_B}|=Isin\theta\int_0^{0.25}B(y)dy=Isin\theta\int_0^{0.25}(0.5y)dy\\\\|\vec{F_B}|=(2.0*10^{-3}A)(sin36.86\°)(0.5T)[\frac{0.25^2}{2}m]=0.187\ N

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