Thanks for your reply @malawi_glenn! Here I'll send you a screen shot what it says.malawi_glenn said:
Ok thank you @malawi_glenn!malawi_glenn said:
This is because there are two different ways to define power in physics: as the rate of change of kinetic energy (K) or as the rate of change of total energy (E). Both definitions are correct and are used in different contexts depending on the problem being solved.
The definition of power as the rate of change of total energy (P = dE/dt) is more commonly used in physics, as it takes into account all forms of energy (kinetic, potential, thermal, etc.) and is more generalizable to different systems.
You should use P = dK/dt when dealing with systems where only kinetic energy is involved, such as a moving object. On the other hand, P = dE/dt should be used when dealing with systems where multiple forms of energy are present, such as a swinging pendulum or a chemical reaction.
No, P = dK/dt and P = dE/dt cannot be used interchangeably as they represent different physical quantities. Using the wrong definition of power can lead to incorrect calculations and results.
In some cases, different symbols may be used to represent power to avoid confusion with other quantities. For example, W is often used to represent work, so P may be used to represent power to avoid confusion. However, both P and W can be used to represent power and work, respectively, as long as their units are clearly stated.