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A simple steam power system has a turbine inlet state of 6.0 MPa and 540 0C and an exhaust pressure 0.008 MPa. The cooling water in the condenser experiences a temperature rise from 20 to 27 0C and
A material is found to have a tenth-thickness of 2.3 cm for 1.25-MeV gamma rays. (a) What is the linear attenuation coecient for this material? (b) What is the half-thickness?
The pressure drop needed to force water through a 1-in.-diameter pipe (the pipe is on a 20 degree hill) is 0.76 psi for every 12-ft length of pipe. (a) Determine the shear stress on the pipe wall.
The reactor was empyu at the start of the experiment. If the concentration of bacteria in the reactor at the end of 2 h is .025 g/L, what is the net specific growth rate in min^-1.
One-tenth kg of a gas in a piston-cylinder assembly undergoes a Carnot power cycle for which the isothermal expansion occurs at 800K. The change in specific entropy of the gas during the isothermal
Determine the irreversibility, in kJ/min, for (1) the heat pump unit, (2) the low heat transfer process, and (3) the high temperature heat transfer process and (4) find the effectiveness. (5) Which
The condenser pressure is 50kPa and the steam exits the turbine at 100% quality. Find the boiler pressure needed and the enthalpy of the steam entering the turbine.
1-2 an actual refrigerator absorbs 500 kJ of heat from a sink at 250 K and reject 660 kJ of heat to environment at 300 K. T0 = 300 K. the heat transfer processes are reversible.
An 0.5 m^3 rigid tank contains equal volumes of Freon-12 vapor and Freon-12 liquid at 312K. What is the change in internal energy of air (an ideal gas) cooled from 550 C to 100 C?
Cells need to be close to a blood vessel to obtain sufficient oxygen. Model the tissue surrounding a blood vessel as a cylinder (radius R2) with a pipe (the blood vessel, radius R1) running through
Steam flows through a horizontal adiabatic throttle which controls the flow to 25.0 ft3/s. Compute the power of the device (in HP) if kinetic energies may be neglected.
An engineer is making an estimate for a home owner. This owner has a small stream of water (Q=1.4cfs T=40C)that is located at an elevation H=34ft above the owner's residence. The owner is proposing
The rotor of an electric motor has a mass of 25kg and a radius of gyration of 180mm. It is observed that 4.2 min is required for the rotor to coast to rest from an angular velocity of 3600 rpm.
For compressible flow, if a pressure vessel is full of a compressible fluid at pressure P. What equations would you use to find to mass flow rate of the fluid out of a nozzle with a diameter D?
Sketch a preliminary layout for the following heat exchanger systems. On the layout sketch indicate pipe work manifolds, access platforms, access for construction, operations and maintenance.
Water flows through a horizontal pipe at a rate of 1gal/s. The pipe consists of two sections of diameters 4in and 2in with a smooth reduction section. The pressure difference between the two section
An opaque, horizontal plate has a thickness of L=21 mm and thermal conductivity k=25 W/mK. Water flows adjacent to the bottom of the plate and is at a temperature of T_infinity,w=25 C.
Determine the work done in lifting a 250-lb refrigerator 4 ft vertically into a van. Alternatively, the refrigerator could be placed on a cart and rolled up a 10-ft-long ramp.
Compute the maximum contact pressure and the width of contact. How deep below the surface is the maximum shear stress and what is the value?
The acme company claims to have designed an adiabatic turbine that will produce 105 BTU per pound of the steam. The operating conditions inlet 100psia at 500F and outlet 50psia at 281F.
Suppose we load this cart with a crate of mass 104 kg, where the crate's center of mass is located in the back-middle of the cart, 0.5 m from its center. Find the weight on the nearer wheels of the
A horizontal axisymmetric jet of air with 10 mm diameter strikes a stationary vertical disk of 200 mm diameter. The jet speed is 75 m/s at the nozzle exit. A manometer is connected to the center of
A heat engine (power cycle) is operating on a Carnot cycle and has a thermal efficiency of 75%. The waste heat from this engine is rejected to a nearby lake at 15oC at a rate of 14 kW. Determine th
Determine the force in members CD and Gf of the truss and state if the members are in tension or compresson. Also indicate all zero force members.
Calculate the change in Entropy, Enthalpy, and Gibbs Energy due to mixing when 35 moles of He gas, 15 moles of Ne gas and 50 moles of N2 are mixed at a constant pressure of 1.00 atm.