A rigid compressed- air tank is to be repressurized to 40 bar by being connected to a high-pressure line containing air at 50 bar and 20°C. The repressurization of the tank occurs fast enough that the process can be assumed to be adiabatic. Assume that the gas can be modeled as ideal and that the specific hear ratio is k = 1.4.
1. If the tank initially contains air at 1 bar and 25°C determine what will be the temperature of the air in the tank at the end of the filling process?

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.

For the closed feedwater heater below, feedwater enters state 3 at a pressure of 2000 psia and temperature of 420 °f at a rate of ix10 ibhr. the feedwat extracted steam enters state 1 at a pressure of 1000 psia and enthalpy of 1500 btu/lbm. the extracted er leaves at an enthalpy of 528.7 btu/lbm steam leaves as a saturated liquid. (16) a) determine the mass flow rate of the extraction steam used to heat the feedwater (10) b) determine the terminal temperature difference of the closed feedwater heater