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- 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°C1. 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 gas6
- 1. In a quasi-static isobaric expansion, 600 J of work are done by the gas. If the gas pressure is 0.7 atm, what is the fractional increase in the volume of the gas, assuming it was originally at 19 L? Use 1 atm≈ AV V 105 Pa & 1 L = 10-³ m³6. An ideal gas expands isobarically from 3 atm from 400 to 600 ml. Heat then flows out of the gas at constant volume, and the pressure and temperature are allowed to decrease until the temperature reaches its original value. Calculate a) the total work done by the gas in the processes and b) the total heat flow to the gas.10-