news_051611

news_051611 - Stuff for Monday PS#13 due up front T1 T2 and...

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Unformatted text preview: Stuff for Monday, May 16, 2011 PS #13 due up front. T1, T2 and T3 stuff: 1 Specific heat c : dU = mc dT or c ≡ m dU dT Ideal gas law: PV = NkB T with kB = 1.38 × 10−23 J/K Temperature and energy: 1 3kB T 3 [mv 2 ]avg = kB T =⇒ vrms ≡ [v 2 ]avg = 2 2 m Thermal energy of a gas: U = f NkB T 2 Near room T , f ≈ 3 (monatomic gas), f ≈ 5 (diatomic gas), and f > 6 (polyatomic gas) f is called the number of molecular “degrees of freedom” Kavg = Gas processes: heat is energy flow from ∆T First Law: ∆U = Q + W Expansion or compression work: dW = −P dV Adiabatic: TV γ −1 = const. PV γ = const. γ = 1 + 2/f ...
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