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An air conditioner provides 1 Kg/s of air at 15 C cooled from outside atmospheric air at 35 C. Estimate the amount of power needed to operate the air conditioner. Clearly state all assumptions made
Find the energy the rock bed can give out. What is the heat engine's efficiency at the beginning of the process, and what is it at the end of the process?
A fully annealed 1040 steel rod is to be cold drawn to 8 mm in diameter to have a yield strength of at least 680 MPa and ductility greater than 35% elongation. What is the smallest starting diameter?
The valve is opened and argon flows into B and eventually reaches a uniform state of 150 kPa, 30°C throughout. What is the work done by the argon? You can assume argon behaves as an ideal gas.
The work hardening of a metal is described by the expression sigma T = 960 xi T^{0.258} in MPa 960. What is the true strain when the true stress is 550 MPa?
The fraction of liquid and vapor is such that when heated the steam will pass through the critical point. Calculate the heat transfer when the steam is heated from the initial state at 14.7 psia to
As the water is heated, the piston expands 3 cm upwards at constant pressure until it hits stops. Heat transfer continues until the pressure is 3 bars. Find the total heat transfer in J.
Expansion occurs to a state with a pressure of 200 kPa. During the process, P*v = constant. Determine the work and heat, per unit mass, in KJ/kg.
Nozzles in gas turbine electrical generators accelerate the combustion gases to higher velocities by burning a fuel. What is the velocity at the outlet of the nozzles?
The differential pressure Pd-Pa is measured with a water manometer that may be read with an uncertainty of 12.44 Pa. Calculate the uncertainty in the dimensional measurement.
Heat transfer occurs and the pressure drops to 200 kPa. KE and PE effects are negligible. Determine the amount of heat transfer.
Design an experiment that can determine Young's modulus for an elastic band. Describe the data you would collect and how you would collect and how you would analyze the data.
The width of the aluminum sheet is 40 mm with a thickness of h(Al)=1 mm. Determine the maximum stresses in the plastic and aluminum if a bending moment of 5.0 N*m is applied.
Write a C++ function named addTime() that will add an integer number to a time-of-day value represented by two separate integers: hours and minutes.
Air with a mass flow rate of 1.5 kg/s is decelerated in diffuser from 250 m/s to 50 m/s. The inlet temperature is 500k and exit pressure is 100 kpa. Determine the exit air temperature and exit area
Find the heat transfer ( Btu h^-1) through the insulation, if the temperature is on the pipe side is 1000 K and the temperature on the outside is 300 K.
The maximum allowable normal stress is 32 ksi, determine (a) the smallest diameter that can be selected for the rod, (b) the corresponding maximum length of the rod.
The partition is now removed, the water expands to fill the entire tank. Determine the final temperature and volume of the tank for a final pressure of 10 kPa.
The fraction of liquid and vapor is such that when heated the steam will pass through the critical point. Calculate the heat transfer when the steam is heated from the initial state at 14.7 lbf/in2
The mean velocity of the steam through the duct is 40 m/s. Determine the flow work required to push the steam into the duct.
Determine the work (kJ) performed by the piston on the ambient environment. Neglect the cross-sectional area of the connecting rod.
Calculate the quality of the steam in the pipe and (b) Is there a limit to the steam quality that can be measured using such a device?
The thickness of each wall is 5mm. For aluminum let E =70 GPa and v = 0.33. Determine the average shear stress in each wall and the angle of twist per unit length.
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.
Determine the entropy change of the wood and the oil. Use properties of engine oil for the oil, and neglect the fact that oil will soak into the wood.