Temperatura aerului dintr‑o cameră de volum V = 40 m3 este t1 = 25 °C. În cameră se aduce un vas de capacitate calorică C = 400 J/K, ce conține o masă de gheață m = 500 g, la temperatura t2 = –10 °C. Considerând sistemul izolat, căldura specifică a gheții cg = 2 100 J/kg·K, căldura specifică a aerului c = 1 006 J/kg·K, densitatea medie a aerului rho = 1,29 kg/m3, determină temperatura aerului din cameră la stabilirea echilibrului termic.
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Consider a u-tube whose arms are open to the atmosphere. now equal volumes of water and light oil (ρ = 49.3 lbm/ft3) are poured from different arms. a person blows from the oil side of the u-tube until the contact surface of the two fluids moves to the bottom of the u-tube, and therefore, the liquid levels in the two arms are the same. if the fluid height in each arm is 30 in, determine the gage pressure exerted by the person on the oil by blowing.
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Temperatura aerului dintr‑o cameră de volum V = 40 m3 este t1 = 25 °C. În cameră se aduce un vas de...
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