How to convert from rev per min to rad per sec
multiply by 2pi/60
First law of thermodynamics in symbols
Q=deltaU+W
First law of thermodynamics in words
Heat supplied to a system either increased the internal energy of the system or enables it to do work
Isobaric
Constant pressure
W=pdeltaV
Isothermal
Constant temperature
p is inversely proportional to v
Isovolumetric
Constant volume, no work done so deltaU= Q
Adiabatic
No heat energy is moved in or out of the system
Area in Otto cycle diagrams
Work lost in process
Second law of thermodynamics
No heat engine can convert 100% of its input heat into work
Thermal efficiency equation
Indicated power/input power
Mechanical efficiency equation
Break power (also called output power)/indicated power
Overall efficiency equation
Brake power/input power
