Total energy.
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The diagram of IE plus SE equals PE represents the relationship between kinetic energy (KE), potential energy (PE), and the total mechanical energy (E) of an object. In this diagram, IE represents the initial energy, SE represents the additional energy supplied, and PE represents the potential energy gained. The total mechanical energy of the object is the sum of the initial energy and the additional energy, which can be converted into potential energy.
Total energy.
Hydraulic grade line is sum of Datum + Pressure Head Energy grade line is sum of Datum + Pressure Head + Velocity Head
To calculate the periapsis, you need to know the initial velocity and distance relative to a central body. The periapsis is the point of closest distance in an orbit. One way to calculate it is by using the specific orbital energy equation, which is the sum of the gravitational potential energy and the kinetic energy: ε = -(GM) / (2a), where ε is the specific orbital energy, G is the gravitational constant, M is the mass of the central body, and a is the semi-major axis of the orbit. The periapsis can then be determined by subtracting the distance relative to the central body from the semi-major axis.
There is no sum of e=mc2, it is an equation concerning matter and energy. e=mc2 stands for: Energy equals mass times the velocity of light squared. E = M C 2