The kinetic energy of a body with mass $ m $ and velocity $ v $ is $ K = \frac{1}{2} mv^2 $. Show that $$ \dfrac{\partial K}{\partial m} \dfrac{\partial^2 K}{\partial v^2} = K $$
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Step 1
First, we need to find the partial derivative of $K$ with respect to $m$: $$\frac{\partial K}{\partial m} = \frac{1}{2}v^2$$ Show more…
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(a) If $m$ is a particle's mass, $p$ is its momentum magnitude, and $K$ is its kinetic energy, show that $$ m=\frac{(p c)^{2}-K^{2}}{2 K c^{2}} $$
(II) Show that the kinetic energy $K$ of a particle of mass $m$ is related to its momentum $p$ by the equation $$p=\sqrt{K^{2}+2 K m c^{2}} / c$$
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