No, Einstein's equation, E=mc², is not limited to relativistic frames of reference. It is a fundamental equation in physics that relates energy (E) to mass (m) and the speed of light in a vacuum (c). This equation is derived from the principles of special relativity but is applicable in a broader context as well.
In special relativity, the equation E=mc² arises from the concept that energy and mass are interchangeable. It shows that mass has an inherent energy content, often referred to as rest energy. When an object is at rest, its total energy is equivalent to its rest energy, which is given by the equation E=mc².
However, it's important to note that this equation is not limited to objects at rest or relativistic scenarios. It applies to any system or particle, whether at rest, in motion, or undergoing changes. For example, in particle physics, where high-energy collisions occur, the equation is used to calculate the energy associated with the mass of particles.
In non-relativistic scenarios, where speeds are significantly smaller than the speed of light, the equation reduces to a simpler form, where the kinetic energy of an object is given by E=½mv². This form is commonly used in classical mechanics to calculate the kinetic energy of objects in everyday situations.
So, while E=mc² originates from special relativity, it has broad applications in both relativistic and non-relativistic contexts, capturing the fundamental relationship between energy and mass.