530.231_HW2 - now opened and the two come to a uniform...

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530.231, Fall 2009 Homework No.2 1. If density of ice is 917 kg/m3, find the pressure at the bottom of a 1250 m thick ice cap on the North Pole. What is the melting temperature at that pressure? 2. A substance is at 2.5 MPa, 25°C in a rigid tank. Using only the critical properties can the phase of the mass be determined if the substance is nitrogen, water or propane? 3. Fill out the following table for substance water: P [kPa] T [ ° C] ν [m 3 /kg] x a 500 100 b 600 0.25 c 2000 250 d 200 0.8 4. Two tanks are connected as shown in Fig. 3.52, both containing water. Tank A is at 300 kPa, v = 0.25 m3/kg, V A = 1 m3 and tank B contains 3.0 kg at 0.6 MPa, 400°C. The valve is
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Unformatted text preview: now opened and the two come to a uniform state. Find the final specific volume. 5. Is it reasonable to assume that at the given states the substance behaves as an ideal gas? a) Oxygen, O2 at 0C, 3 MPa b) Methane, CH4 at 30C, 4 MPa c) Water, H2O at 200C, 3 MPa d) R-134a at 0C, 1MPa e) R-134a at 0C, 100 kPa 6. A 1 m3 rigid tank has propane at 150 kPa, 298 K and connected by a valve to another tank of 1 m3 with propane at 200 kPa, 400 K. The valve is opened and the two tanks come to a uniform state at 325 K. What is the final pressure?...
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This note was uploaded on 03/30/2010 for the course MECHE EN.530.231 taught by Professor Kitsi during the Fall '09 term at Johns Hopkins.

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