Ionisation energy of hydrogen: Why are kinetic and potential energy connected by $2 T = -V$ in the derivation?
98846
Why is Kinetic Energy = (-) Total Energy and Potential Energy = 2 $\times$ Total Energy?
124703
Where does the $i$ come from in the Schrödinger equation?
82418
Why not drop $\hbar\omega/2$ from the quantum harmonic oscillator energy?
7152
Using the uncertainty principle to estimate the ground state energy of hydrogen
156804
Behaviour of free electron with constant velocity
28057
Deriving $p = mv$ from translational symmetry (momentum conservation law)?
76423
Why is the total energy of an orbiting system negative?
100944
The relationship between the energy and amplitude of a wave? Derivation?
40028
Calculating Energy of a Wave
123054
How can we have negative work in electrostatics, if $W=(\epsilon_0/2)\int\! E^2\ \mathrm{d}\tau$?
86439
Why do we ignore rotational energy in monatomic gases?
130422
Derivation of the Noether current
152895
What is wrong with this derivation of $\frac{d}{dx}x^2$?
77318
Why do we consider potential energy function $U(x)$ differentiable?
10587
Bound states of the $V(x)=\pm \delta'^{(n)}(x)$ potential?
29928
Is kinetic energy a relative quantity? Will it make inconsistent equations when applying it to the conservation of energy equations?
60045
Temperature and kinetic energy of molecules