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R-22, flowing steadily at 70 lbm/hr, enters the expansion valve of a refrigeration system as a saturated liquid at 183.09 psia. At the exit of the valve, the pressure is 31.162 psia.
A 10 cubic foot tank is initially evacuated and is then filled from a supply line which contains R-22 at 100 psi, 100 F. Assuming no significant heat transfer.
Kinetic and potential energy changes from the intlet to exit can be neglected. Determine the compressor power, in hp, and the volumetric flow rate at the exit in units of ft^3/min.
Heat loss from the nozzle per unit mass of steam are estimated to be 1.2 Btu/lbm. Determine the exit temperature of the steam.
Tin atoms are introduced into an FCC copper crystal, producing an alloy with a lattice parameter of 3.7589*10^-8 cm and a density of 8.722 g/cm^3. Calculate the atomic percentage of tin present in
Determine a) work produced per kilogram of air (kJ/kg) b) the change in entropy for the air (kJ/kg*K). Assume ideal gas, constant specific heat Cpo = 1.0035 kJ/kg*K Thanks for the help
Determine the smallest allowable value of the coefficient of static friction between a trunk and the floor of the baggage car if the trunk is not to slide.
Determine how many candy bars she needs to take with her. Assume that an average 68 kg adult consumes 639 Calories/hour while bicycling, and the energy content of a 20 g chocolate candy bar is 105 C
Consider 2 kg of austenite that contain 1.15 wt% of carbon. The alloy is cooled to 726C. What is the proeutectoid phase?
The quantities heat transfer and work are very different than the quantities pressure and specific volume. Briefly explain the major differences between there two important groups of thermal quanti
During the process, the pressure and specific volume are related by Pv=constant and the work has a magnitude of 32 kJ. Sketch the process on P-v diagram. Determine the heat transfer, in kJ.
Changes in kinetic and potential energies are negligible. Calculate the heat transfer per kilogram of nitrogen flowing through the heater. Assume that nitrogen behaves as an ideal gas.
Determine (a) the temperature at which the normal stress in the aluminum bar will be equal to -90 MPa, (b) the corresponding exact length of the aluminum bar.
The work done by the propane is measured as 42.4 kJ. Kinetic and potential energy effects can be ignored. Determine whether it is possible for the work measurement to be correct.
A piston-cylinder assembly 0.28 m^3 of gas expands in a path pv^1.2 = constant until the pressure drops from 860 kPa to 400 kPa. If the internal energy does not change, how much heat must be transfer
At the turbine exhaust the steam velocity is 150 m/s, the pressure is 10 kPa, and the enthalpy is 2510 kJ/kg. How many megawatts of power are generated by the turbine?
The inventory, required components, and profit for each product appear in the following table. Determine how many of each product to make in order to maximize the profit.
Using the finite different method with six equally spaced nodes along the fin in the x-direction, determine (a) the temperatures at the nodes, (b) the rate of heat transfer from the fin for W=1 m, a
If their velocities measured relative to the cart are 3ft/s to the right and 2 ft/s to the left, respectively, determine the velocity of the cart while they are walking. They are 20ft apart.
A bare-footed person whose feet are at 32C steps on a large aluminum block at 10C. Treating both the feet and the aluminum block as semi-infinite solids, determine the contact surface temperature.
The mass is released from rest in the position x=1m. use numerical integration with delta x =0.01s to determine the position and velocity of the mass for the first 5 steps.
Is linear momentum of the system conserved? Why or why not? Determine the angular velocity of the combined body just after impact (in terms of L, m and v).
Calculate the steady-state creep rate (in hr-1) if the bar has a tensile stress of (4.6x10^1) MPa at (2.45x10^2)oC. Assume that the activation energy for creep is 140 kJ/mol.
If the spar has a cross sectional area of 10 mm x 20 mm, how many hours will the spar last based on the data in the graph provided?