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Find the initial and final pressures (kPa) of air, and calculate the change in internal energy and enthalpy (kJ) of air (i) using values from Table A-22 and (ii) assuming constant specific heats.
Calculate the modulus of resilience for this alloy [in J/m^3 (which is equivalent to Pa)] given that it exhibits linear elastic stress-strain behavior.
Estimate the maximum tensile stress to yield a fatigue life of 2.5*10^7 cycles. Assume the parameter Y has a value of 1.4, which is independent of crack length.
The following data are also known: U2 = 2000 kJ and U3 =3500 kJ. Neglecting changes in in kinetic and potential energy, calculate the change in volume of the gas during process 2-3, in m³.
The relationship between the pressure and volume of the gas during the process is pV²=constant. Sketch the process on p-V diagram and determine the work, in kJ.
A speed reducer with a ratio of 10 to one when tested at 1000 rpm was found to have a 50Nm output torque to a 6 N-m input Torque, what's the efficiency of the speed reducer?
Now all the water is heated until all the saturated liquid is vaporized (state 2). Determine the following the temperature of water in state 2 in degrees.
The velocity of the system changes from 10 ft/s to 50 ft/s, and the elevation decreases by 150 ft. The acceleration of gravity is 32.0 ft/s². Determine change in internal energy of the system,
Delegating some parts of the plan to her subordinates. What are the factors the director needs to consider when she chooses the best way to come up with this plan?
If the temperature of the air at the inlet is 17 C, the exit temperature is 137 C, and the exit area is 200 cm^2, determine the power required (kW) if the inlet velocity is neglected.
The magnitudes of two forces shown are P=16lb and Q=22lb determine the magnitude of the combined moment of P and Q about point 0 and the direction cosines of this vector?
The air temperature at the cruising altitude is about -60 degrees celcius. Determine the Mach number of this plane for the stated limiting conditions.
Earl obtained a loan for 17000 dollars. He will pay it back in 28 months with an interest rate of 9 yearly compunded monthly.
If the initial water enters the boiler as saturated water at 1000 psi a (h=542.4 Btu/Ibm) and leaves as superheated steam at 950 psi a and 1000 F ( h= 1507.4 Btu/Ibm), how much heat is added to the
Calculate the activation energy for vacancy formation in aluminum, given that the equilibrium number of vacancies at 500°C (773 K) is 7.57 × 1023 m3.
A tank with 100 kg of ammonia is connected to a refrigeration loop, with a valve that opens to keep the loop at a constant pressure. How much heat is transferred to the tank during this time?
Calculate the electric power required to run the motor (in hp - round the answer to the nearest higher whole number).
Derive the symbolic formula for work by integration and find the work done by the gas in [J]. Check the answer by plotting the process by hand on a PV diagram and calculating the work using geometry
Derive the symbolic formula for work by integration and find the work done by the gas in [J]. b. Check the answer by plotting the process.
A heat pump (working in a thermodynamic cycle mode) is to be used to heat a house during the winter. Determine the power required to drive this heat pump.
The refrigerator in a kitchen receives electrical input power of 150 W to drive the system, and it rejects 400 W to the kitchen air. Determine the rate of energy taken out of the cold space.
Let us consider the heat engine which receives a heat transfer rate of 1 MW at a high temperature of 823 K. How much energy is discarded to the ambient surroundings?
Now derive the stress field in a cylindrical symmetric situation. Assume that the length of the cylinder is much larger than the diameter of the cylinder.
Knowing that the fuel is consumed at a rate of 225 kg/s and ejected with a relative velocity of 3600 m/s, determine the maximum speed imparted to the spacecraft if the rocket is fired vertically fro