Does energy have a sign?
14373
In physics sometimes we find energy that is negative. What does the negative sign indicate?
13319
Recognize physical constants?
131167
Kinetic energy of the object, but Potential energy of the system: Why is it so?
143679
Is the sign of principal components meaningless?
54113
Does the potential energy of a single object exist?
20997
Can an electron jump to a higher energy level if the energy is insufficient or exceeds the $\Delta E$?
15019
Does a single photon's energy depend on frequency? (photoelectric effect)
63544
Is there a probability that an electron in an atom change its energy level due to emitting gravitational wave?
42186
When is the Hamiltonian of a system not equal to its total energy?
22370
Does gravity affects on electrons in a noticeable way?
60705
What does this E symbol mean?
56741
What does the sign $\propto$ mean?
119004
Proof of conservation of energy?
52833
Is heat always associated with Light?
55948
Negative energy levels in the diagram for a hydrogen atom
16282
Coincidence, purposeful definition, or something else in formulas for energy
148069
Different Sum signs