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An automotive repair shop stock many sizes of tires. One particular size and model is purchased for $15 and sold for 30. The manager estimates the cost to order at $75m, including the delivery charg
A turbine accepts superheated steam at 800 psia and 1200°F and rejects it as saturated vapor at 2 psia. Calculate the velocity at the exit and predict the horsepower output of the turbine if the
The power output of a steam turbine is 30 MW. Determine the rate of steam flow in the turbine for saturated steam entering at 0.1 MPa. The outlet pressure is 10 kPa and the expansion is reversible
A block having a mass of 0.8 kg is suspended from a spring having a stiffness of 120 N/m. If the dashpot provides a damping force of 2.5 N when the speed of the block is 0.2 m/s, determine the peri
Determine the magnitude of the force FA the boy at A must exert in order to prevent the gate from turning. Neglect the thickness of the gate.
If the isentropic efficiency of the compressor is 80 % determine the actual and ideal work input to the compressor in kj/kg,show the inlet state and the ideal and actual exit states on a T-s diagram
At the beginning of the compression process in an ideal Otto cycle air is at 95 KPa ,27 degree c ,and the temperature at the end of the compression process is 416 degree c .1600 kJ/kg of heat is tra
The nominal composition by weight of this material is as follows: carbon 0.08 percent; chromium 19 percent; nickel 10 percent; iron the remainder. Calculate the macroscopic absorption cross sectio
Calculate and plot the response of a system with transfer function G(s)=100(s^2+2)/(s^3+s^2+5s+1) to the input, u(t)=10exp(-t)sin(5t), assuming zero initial conditions.
The third law entropy for gas at STP is 270 J/K/mole. Calculate delta U and delta G for the process and also the initial state of the gas.
A gas turbine has a three-stage compression with inter-cooling and a three-stage expansion with re-heating. Air enters the compressors at 300Kand100kPa.
A tank of propane has capacity of 120 gallons, what would the tank be rated in terms of cubic feet, cubic meters and liters? If the pressure gage shows a reading of 45psig.
A flat-bottomed barge, 25 m long and 10 m wide, submerged to a depth of 1.5 m, is to be pushed up a river at a rate of 8.6 km/hr. Calculate the power needed to overcome skin friction (in kW) if the
What is the optimal number of cases to have on hand to minimize expected total costs in a single week? show calculations. What is the expected cost?
An elevator, having a weight of 500 lb, needs to be lifted a distance y = 20ft, starting from rest and then stopping after at t=6 sec. A single motor and cable-winding can be mounted anywhere and us
Air expands in a piston-cylinder device with a polytropic exponent of 1.3. The initial pressure and temperature were 630 KPa and 550oC respectively. The final pressure is 100 kPa. Find the specific
Determine the amount of energy transfer by work from the steam to the piston during the process, in KJ. Also determine the initial and final quality and the enthalpy change.
An engineer designing a vibration isolation system for an instrument console models the console and isolation system as a 1 degree-of-freedom spring-mass-damper system.
Heat is conducted along a circuit board that has a copper layer on one side. The circuit board is 15 cm long and 15 cm wide, and the thicknesses of the copper and epoxy layers are 0.1 mm and 1.2 mm,
Now the valve is opened and the entire system is allowed to reach equilibrium at temperature of 20oC. Determine the volume of the second tank and the final equilibrium pressure.
A body is in sliding contact with an unlubricated horizontal surface and is horizontally constrained by a spring. The mass of the body is 15kg, and the stiffness of the spring is 1800N/m.
A simple steam power system has a turbine inlet state of 120 bars and 600c and exhaust pressure of 0.08 bar. The cooling water., in the condenser experiences a temperature rise from 22 to 28c and To
If the initial volume of this gas is 45 ft^3, find the final volume and temperature and find the work done. Assume that p, V, and T are interrelated by the equation of state pv = RT (R constant).
During a steady flow process,dry saturated steam at 450 psia expands in a turbine to 10 psia. The mechanical efficiency of the turbine is 85%. Neglecting changes in kinetic and potential energy and
Determine the rate of entropy generation in the wall, and the rate of total entropy generation associated with this heat transfer process.