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A dam spillway is tested with a 1/30th scale model, matching the Froude number. What will be the velocity and flow rate for the model?
To what pressure (in atm) should the air in the wind tunnel be pressurized to scale both the Reynolds number and Mach number accurately?
The convective heat-transfer coefficients are: ho = 4 Btu/h ft2 oF and hi = 2 Btu/h ft2 oF. What is the heat-transfer rate (W) from the room into the freezer?
The temperature and pressure of the stream entering the flash drum are 105°C and 325 kPa. Determine the K-values from a DePriester chart, analytically solve the material balance.
Determine the height (m) above the shower at which the tank should be placed. Sketch the system and indicate points you use along the streamline.
Calculate the cost per piece of a milling operation that is used to machine a pocket of 2"x3"x0.5" (LxWxD). The material being machined is high silicon aluminum.
Locale the critical points of f(x,y) = x3 +y3 + 3xy + 5 and classify them using the second derivative test. Find three positive numbers whose sum is 18 and the sum of whose squares is as small as po
The steam expands reversibly and isothermally to a final pressure of P2 = 800 kPa. Determine the heat transferred and the work done during this process.
An electric resistance heater placed in the tank is now turned on and kept on until all the liquid in the tank is vaporized. Determine the entropy change of the steam during this
Heat in the amount of 100 kJ is transferred directly from a hot reservoir at 1200 K to a cold reservoir at 600 K. Calculate the entropy change of the two reservoirs and determine
Assuming static conditions, calculate the pressure in the gas and the oil phases if the pressure in the water phase is 110 kN/m^2.
Saturated liquid water is compressed from 100 kPa (State 1) to 2.5 MPa (State 2) in an adiabatic pump having 85% isentropic efficiency. Determine the entropy generation (kJ/kg-K) for the pump.
Calculate (a) the coal firing rate in lb/hr, (b) the fuel gas flow rate in scfm, and (c) the SO2 removal efficiency needed to meet a standard of 1.4 lb/MWh gross electrical energy output.
The facility is required to collect all the vented air and route it to a biofilter to control total emissions to less than 30 kg of ethanol per day. Calculate the required control efficiency.
The power output of the two-stage turbine is 80 MW and isentropic efficiency of each turbine stage is 84%. Calculate the rate of entropy generation (kW/K) for the two-stage turbine.
What is the fracture toughness K1c of the material of the sample? If the material has a modulus E of 200 GPa, what is its toughness?
A homogeneous liquid solidifies directly to a solid containing A and the high temperature polymorph of B. Construct the phase diagram.
Hemispherical end caps are welded to a cylindrical main body to form a propane storage tank. Determine the minimum wall thickness Tc of the cylindrical.
A hot air balloon (approx as a sphere of diameter 50ft) is to lift a basket load of 600lbf. To what temperature must the air be heated in order to achieve lift off?
Determine the final temperature in °C, the entropy change for the copper vessel and each of the liquid water masses, and the amount of entropy produced.
The isentropic efficiency of the compressor is 80%, mass flow rate is 2247kg/hr, and I found T2s=533K and T2a=591K. How much power input does this compressor require?
Helium gas enters a nozzle whose isentropic efficiency is 88 percent with a low velocity, and it exits at 15.3 psia, 160F, and 840 ft/s. Determine the temperature and pressure at the nozzle inlet.
The compression and power stroke efficiencies are 90%. Using the provided engine data, determine the charge mass (grams). The cut-off ratio.
A 3-in. diameter rod of copper is to be reduced to a 2-in. diameter rod by being pushed through an opening. The modulus of elasticity for the copper is 17 x 106 psi and the yield strength is 40,000
It is initially at a uniform temperature of 25 °C and is suddenly immersed in a liquid at 150 °C with h = 120 W/m2-°C. Calculate the time necessary for the rod to cool to 120 °C.