If energy can't be created and can't destroyed
2073
Conservation law of energy and Big Bang?
107031
Is conservation of energy only for isolated systems?
116033
Energy conservation limited by uncertainty principle
132041
Numbers which cannot be formed
155558
If energy is only defined up to a constant, can we really claim that ground state energy has an absolute value?
20997
Can an electron jump to a higher energy level if the energy is insufficient or exceeds the $\Delta E$?
115200
Why does energy have to be emitted in quanta?
147954
Relation between power and energy
146039
Is it always possible to define energy of a system?
48114
Quantum mechanics - how can the energy be complex?
115752
What are the limits of Energy-bending?
40328
Can something be nothing?
144698
Why do many people say that virtual particles do not conserve energy?
56266
Potential energy and the work energy theorem
68284
Is the law of conservation of energy still valid?
155552
Is it possible for a system to have negative potential energy?
28128
Why is information indestructible?