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1. Suppose, by rapid solidification from the liquid state, that a supersaturated Al-7% Li alloy can be produced and subsequently aged. Compare the amount of β that will form in this alloy with that formed in a 2090 alloy.
2. Determine the amount of Mg2Al3 (β) expected to form in a 5182-O aluminum alloy (See Figure 14-2).
For the condition when the floor and duct temperatures are 30 and 80°C, respectively, and the thermal conductivity of concrete is 1.4 W/m · K, calculate the heat rate from each duct, per unit length of duct. Use a grid spacing with ?x = 2?y, where..
1. Octane (C8H18) is burned with 20% excess air, yielding CO2, CO, O2, H2O, and N2 only. If 5% of the dry products (molar basis) is O2, determine (a) the balanced reaction equation. (b) the analysis of the products on a dry molar basis.
saturated water vapor in a closed sysytem is condensed by cooling it at constant pressure to a saturated liquid at
Air is compressed by an adiabatic compressor from 95 kPa and 27°C to 600 kPa and 277°C. Assuming variable specific heats and neglecting the changes in kinetic and potential energies, determine (a) the isentropic efficiency of the compressor and (b) t..
A hot-air balloon of mass m is used to lift a load, Mg, by means of 12 equally spaced elastic ropes, each of stiffness k (see Fig. 5.60). Find the natural frequencies of vibration of the balloon in vertical direction. State the assumptions made in..
An inventor has proposed a multi-blade wind turbine. The downwind rotor is to have a diameter of 12.2 m. Each blade is 5.36 m long, with a thickness of 7.62 cm and width of 20.3 cm. Assume that the blades have a rectangular shape.
A piston-cylinder filled with air receives 10 kJ of heat and expands, doing 5 kJ of work. What is the change in internal energy of the air?
the load bearing piston in a certain hydraulic has an area 50 times as large as the input piston. if the larger piston
Calculate the moment of inertia Id for a W 12 × 50 wide-flange section with respect to a diagonal passing through the centroid and two outside corners of the flanges. (Use the dimensions and properties given in Table E-1.)
Water in an open dish exposed to dry air at 25oC is found to vaporize at a constant rate of 0.04 g/h-cm2. Assuming the water surface to be at the wet-bulb temperature of ll.0°C, calculate the effective gas-film thickness
An airplane tows a 2-m-tall advertising banner at a speed of 160 km/h. If the banner is flat and 5 m long, then estimate its drag assuming fully turbulent flow (μ = 1.8 × 10-5 N s/m2, ρ = 1.2 kg/m3).
Air at 22 kPa, 220K and 250 m/s enters a turbojet engine in flight at an altitude of 10,000m. The diffusor slows the air down to a very low speed relative to its inlet. The pressure ratio across the compressor is 12. The turbine inlet temperature is ..
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