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Determine the equilibrium mole fractions of NO and NO2. Comment on their change with respect to the exhaust gas composition at 2000 K.
Diffusive jumps will be made from the body center atom position to one of its nearest atom positions. List all lattice translation vectors defined by these nearest neighhbor atom jumps;
If these viscosities are the safe limits for the oil, specify the maximum start-up speed and the maximum running speed you would recommend for the pump.
Oil "A" has a viscosity of 80Cst at 40C and 8Cst at 100C. Oil "B" has a viscosity of 90Cst at 40C and 15Cst at 100C. Which oil has the higher viscosity index?
Given the following operating conditions for a rolling bearing, what lubricant would you select and what is the reason for your choice?
An electric current of 0.25 A flows through a 5-ohm electrical resistor placed in an evacuated chamber. The resistor is a 30-mm-long cylinder with a diameter of 5 mm.
Would it be a possible to use a normal domestic refrigerator as a heat source for a small hot tub or whirlpool? If so, would estimate to be the maximum heating rate.
Consider a piston-cylinder assembly containing 0.12 kg of nitrogen at 300 K and 1 atm (state 1). The nitrogen is heated at constant pressure to 700 K (state 2). Plot the process on p-v and t-v coord
Find the relationship between the axial stress sigma, shear stress tau and tensile yield strength Y to cause yielding, according to the Tresca yield critrion?
A temperature measuring devise has been used to measure a dynamic temperature change in a system. The system is no longer available for measurements but the results of the dynamic measurement are av
The downward motion is resisted by an oil film between the piston and the pipe wall. The film thickness is 0.002 inches and the cylinder weighs 0.5 lb. Compute the velocity, V if the oil viscosity i
A stone of 20 kg of mass is held 15 m above a tank containing 200 kg of water. The stone, water and the air are at the same temperature initially.
Determine the instantaneous rate of heat transfer from a 1.5-cm-diameter ball bearing with a surface temperature of 150 C submerged in an oil bath at 75 C if the surface convective heat transfer co
If the air temperature is 60F at standard atmospheric pressure at sea level, and if the differential gage rads a pressure difference of 15psf, what is the air velocity?
Determine the velocity of the ball at the points of the trajectory described by the ball where the radius of curvature is equal to three-quarters of its value at A.
The atmospheric pressure at a location is usually specified at standard conditions, but it changes with the weather conditions. As the weather forecasters frequently state, the atmospheric pressure
Assuming a transition Reynolds number of 5 x 105, determine the distance from the leading edge of a flat plate at which transition will occur for each of the following fluids when u∞ = 1 m/s:
A manometer connected to the tap shows a head of 0.14 in. of mercury above atmospheric. Determine the approximate speed of the air leaving the nozzle if it is at 40°F and 14.7 psia.
A plane wall, 7.5 cm thick, generates heat internally at the rate of w/m^3. One side of the wall is insulated, and the other side is exposed to an environment at 90 degrees celsius.
Assuming negligible internal resistance, derive a differential equation that could be solved to determine the rod temperature as a function of time during the heating process.
The R-410a is compressed to 2MPa, 60 C in a reversible (internally) polytropic process. Find the polytropic exponent n ans calculate the work and heat transfer.
Refrigerant 134a at 700 kPa and 40oC is expanded adiabatically in a closed system to 60 kPa. Determine the work produced, in kJ/kg, and final enthalpy for an isentropic expansion efficiency of 80 pe
A 30-cm-diameter, 5-m-long steam pipe passes through a room where the air temperature is 20 C. If the exposed surface of the pipe is a uniform 40 C, find the rate of heat loss from the pipe to the