a) The entropy change AS, for an ideal gas is given by: ∆S = ∫r2 r1 Cv dt/T - R∫v2 v1 dv/V
Where T is the thermodynamic temperature, V is the volume and R=8.314. Determine the entropy change when a gas expands from V₁ = 1x 10-³ m3 to V₂ = 3 x10-³ m³ for a temperature rise from T₁ = 100K to T₂ = 400K given that: Cv = 45+6× 10-³T + 8×10-6T² Substitute the expression for Cv into the integral and remember to use SI values only b) The average value of a complex voltage waveform is given by: Vav = 1/╥∫ (10 sin cot + 3 sin cot + 2 sin 5cot) dt Evaluate VAV correct to 2 decimal places. Omega = 0.5 radians/second