An engine absorbs 1.70 kJ from a hot reservoir at 277C and expels 1.20 kJ to a cold reservoir at 27C in each cycle. (a) What is the engines efficiency? (b) How much work is done by the engine in each cycle? (c) What is the power output of the engine if each cycle lasts 0.300 s?
Physics 2 for Engineering Week 13 Traveling Wave y=A cos (k x-ω t) k=2π/λ ω=2 πf Superposition of Waves y (x, t) =1 (x, t) 2y (x, t) for two waves with same A, k, and ω Constructive interference amplitude = 2A Destructive interference y=0 Standing Wave on a String L = ½ λ 2 nodes Mode 1 Fundamental Mode L=1 λ 3 nodes Mode 2 Second Harmonic / First Overtone L=3/2 λ 4 nodes Mode 3 Third Harmonic / Second Overtone L= 2 λ 5 nodes Mode 4 Fourth Harmonic / Third Overtone λ = 2L / n v=f λ f = v / λ = n v/2L Sound and Hearing: sound waves due to oscillation of molecules; longitudinal wave p = B k
