How energy $E= \pi k T$?
131166
Kinetic energy as $\pi k_B T$
105177
Gosper's unusual formula connecting $e$ and $\pi$
117326
Why energy curves spacetime?
28057
Deriving $p = mv$ from translational symmetry (momentum conservation law)?
49554
Physical meaning of this integral in $k$-space
24860
What can $E=mc^2$ do?
45625
Is energy content of a system different depending on the observer?
154508
The energy method for $u_{tt}-du_t-u_{xx}=0, (0,1)\times(0,T) $
130366
Self-energy of a uniformly charged, non-conducting sphere, using energy density formula
152110
How does $p\cdot u$ relate to observed energy and momentum for a massive particle?
100694
Kinetic energy in work energy theorem
44400
$e^{2\pi i x} = (e^{2\pi i})^x$: What happens if x is rational?
122603
How does $\mathcal E(\rho)=\mathrm{Tr}_{env}[U(\rho\otimes\rho_{env})U^\dagger]$ turn into $P_0\rho P_0+P_1\rho P_1$?
35277
Why is $\mathbb{E}[X] = 1 + \sum^\infty_{k=1}\mathbb{P}(X > k)$ true?
62867
Is $E^2=(mc^2)^2+(pc)^2$ correct, or is $E=mc^2$ the correct one?
23946
Prove the definitions of $e$ to be equivalent
141474
Prove the Total Mechanical Energy of the System is Conserved via Differential Equations