MAE 204 Lecture Notes - Lecture 3: Thermal Energy, Sign Convention, Specific Kinetic Energy
28 Sep 2016
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Pressure constant densit p then p2 - p1 = pgh. Look at a column p(z) density is changing when z increases differebtial element we can have dp da dz and they re mall since a dz are small assume p(z) is constant that element. Laten energy energy of the system phase chemical energy: bonds between atoms/ molecules nuclear energy: energy within atoms we lomp all microscopic energy into the internal energy internal energy : u(j,kj,etc ) specific internal energy: u (j/kg,etc ) 2. macroscopic energies : need a zero kinetic energy, ke- 1/2 mv^2 (j) specific kinetic energy, ke = 1/2 v^2. What is z = 0 potential energy pe = mgz (j) z is the hight specific potential energy, pe = gz. If you are interested in the change of ke or pe, the zero is implicitly defined. Dpe = pe2 - pe1 = m2gz2 - m1gz1.
