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If the current through and the voltage across a component in an electric circuit are
i(t) = 17 cos(ωt - π/12) mA
v(t) = 3.5 cos(ωt + 1.309) V
Determine the average power dissipated as heat in the component.
Repeat parts (b) and (c) if the phase angle of the current is changed to 0?.
Three aluminium cylindrical pressure vessels thicknesses 14 mm and radius 840 mm. They are periodically filled and emptied to an interal pressure of 2MPa. Cracks can grow through the wall driven by cycle of stress on pressurisation.
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