An ideal gas with CP = (7/2)R and molecular mass of 28 kg/kmol enters a steady state nozzle at T = 500 K and P = 0.5 MPa. The entering stream has a negligible velocity but the exiting stream is travelling 100 meters per second. What is the temperature of the exiting stream?
A. 504. K
B. 495. K
C. 328. K
D. 493. K
E. Insufficient information to solve
A. Incorrect. You have made a sign error. Also consider that the energy to propel the fluid must have come from the internal energy of the gas. Removing (converting) internal energy from a substance should make it colder, not warmer.
B. Correct.
C. Incorrect. Redo the calculations and carry your units through completely.
D. Incorrect. You are probably using the wrong heat capacity to calculate the difference in specific enthalpies.
E. Incorrect. There is enough information supplied to solve the problem with appropriate assumptions.
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