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user5402
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How to find the falling time of an object when acceleration is not a constant?
So basically $$t=\int\limits_{x_i}^{x_f}\frac{1}{\sqrt{v_i^2+2\int\limits_{x_i}^{\lambda}a(x)dx}}d\lambda$$
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Why electric potential definition demand the positive sign of test charge?
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Salt concentration in flowing water
@DavidWhite You mean $\dot{N}_s(t)=kN_s(t)$?
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Salt concentration in flowing water
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Salt concentration in flowing water
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Do objects besides strings, ropes, and rods have tension?
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Do objects besides strings, ropes, and rods have tension?
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