1. A rigid vessel contains 5kg of wet steam (water) at 0.4 MPa. After the addition of 9585 kJ of heat, the steam has a pressure of 2.0 MPa and a temperature of 700°C Determine (a) the initial quality, (b) internal energy, and (c) specific volume of the steam.

A 25-kg iron cannonball is fired with speed 220 m/s. If it hits a concrete wall and half of its initial kinetic energy (KE =mv²) is converted to internal energy in the cannonball (or heats the cannonball), then how much does the temperature of the cannonball increase? The specific heat of iron is 450 J/kg.°C. А. 32.16°C D. 22.82°C В. 28.90°C Е. 24.18°C C. 21.72°C F. 26.89°C

1. Two moles of helium gas are placed in a cylindrical container with a piston. The gas is at room temperature 27 °C and under a pressure of 3.3.105 Pa. When the pressure from the outside is decreased, while keeping the temperature the same as the room temperature, the volume of the gas doubles. Use that the gas constant R = 8.31 J/(mol K). Think: What kind of process is this? Isobaric, isothermal, adiabatic, isochoric or non-quasi-static? (a) Find the work the external agent does on the gas in the process. W = ext. agent (b) Find the heat exchanged by the gas and indicate whether the gas takes in or gives up heat. Assume ideal gas behavior. Q= ✓J Q is realeased by gas Q is absorbed by the gas

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