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A long, 10 cm square copper bar is bounded by 260C gas flows on two opposing sides. These flows impose heat transfer coefficients of 46W/m^2K The two intervening sides are cooled by natural convecti
Show the compression process on P-v diagram. Label the states, show property values, and indicate appropriate lines of constant temperature
A large pipe carries steam as a two-phase liquid-vapor mixture at 1.0 MPa. A small quantity is withdrawn through a throttling calorimeter, where it undergoes a throttling process to an exit pressure
A spherical balloon is inflated from a diameter of 10 cm to a diameter of 20 cm by forcing air into the balloon with a tire pump. The initial pressure inside the balloon is 150 kPa. During the proce
If the Pu needs to be compressed to 25g/cm^3 to explode, what strain is needed to obtain this density? [strain = (delta Length)/Length)]?
If the Pu was in the shape of a cylinder with equal diameter (d) and length (L), what was the diameter (in cm) at ambient conditions?
You know that the fin is 1.3 ft in length and the cruising speed of a stingray is 25 km/hr. What is the boundary layer thickness 6 inches from the leading edge of the fin?
Wet steam (P=12.8 kPa, x=0.90 ) enters a heat exchanger with a flow rate of 1.2 kg/s. cold water at 12.8 kPa and K also enters the exchanger with a flow rate of 30 kg/s. the seam and the water mix a
A 1-ft3 tank that is initially evacuated is connected by a valve to an air supply line flowing air at 70oF, 120 psi. The valve is opened, and air flows into the tank until the pressure reaches 90 ps
Water flowing in a line at 60 lbf/in2, saturated vapor is taken out through a valve at 14.7 lbf/in2. What is the temperature as it leaves the valve assuming no changes in kinetic energy and no heat
The inlet state is 60 PSI, 102 F, and the exit state is 14.7 PSI, -20 F, assuming the velocities to be low and the process to be adiabatic, find the required mass flow rate of air through the turbin
A flow of 2 kg/s of saturated liquid R-134a at 200 kPa is mixed with 3 kg/s of R-134a at 200 kPa and 10?C. The liquid and vapor phases of the mixture are separated, and each exit separately at 200 k
A rod has a cross sectional area of 1 cm^2. Its material has the following strength properties, beyond which it breaks: maximum shear stress,400 kPa; maximum tensile stress, 1.0 MPa; maximum compres
While trapped in a cylinder, 2.27 kg of air is compressed isothermally (with a water jacket being used around the cylinder to maintain constant temperature) from initial conditions of 101 kPa and 16
A Brayton cycle operates with inlet air at 14 psi and 80F. The turbine inlet temperature is 1800 F and the pressure ratio is five.
Low-velocity steam (with negligible kinetic energy) enters an adiabatic nozzle at 300 C and 3 MPa. the steam leaves the nozzle at 2 MPa with a velocity of 400 m/s. the mass flow rate is 0.4 kg/s.
A piece of steel has a conductivity of k= 15 W/mK, and a brick has k=1W/mK. How thick a steel wall will provide the same insulation as a 10cm-thick brick?
Two kilograms of zinc at 500C and 1 atmosphere is contained in a thermally insulated jacket. The system is compressed reversibly to a pressure of 15,000 atmosheres. Calculate the temperature change
Compute the concentration of carbon at 0.2 mm from the carbon-free surface of the 1030 steel bar after 1 hour in vacuum at 1000 degrees Celsius. Take the initial carbon concentration of the 1030 ste
The Corundum crystal structure, found in the compound Al2O3, consists of an HCP arrangement of o^(-2) ions; the Al ^(3) ions occupy octahedral positions. What fraction of the available octahedral p
A satellite P is in a circular oribt of radius rho around a fixed mass O. How much energy is required to change to an elliptical orbit of eccentricity e and semimajor axis a?
A team of design students working on a mousetrap-powered vehicle decides to use computercompact discs as wheels. The discs are lightweight and readily available.
The inlet to a nitrogen compressor is a pipe of 5cm internal diameter; its outlet is a pipe of 2 cm internal diameter. At steady state, the temperature at the inlet is T(in) = 300k.
Warm air is contained in a piston-cylinder assembly oriented horizontal as shown in figure P.142. The air cools slowly form an initially volume of 0.003 M^3 to a final volume of o.oo2 m^3.