Irregular areas, volumes and mean values of waveforms 211
5. An indicator diagram of a steam engine is
12 cm long. Seven evenly spaced ordinates,
including the end ordinates, are measured as
follows:
5.90, 5.52, 4.22, 3.63, 3.32, 3.24, 3.16 cm
Determine the area of the diagram and the
mean pressure in the cylinder if 1 cm represents 90 kPa.
[49.13 cm 2 , 368.5 kPa]