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1. Look carefully at how messages and mailboxes are represented in the e-mail system that you use. Model the object classes that might be used in the system implementation to represent a mailbox and an e-mail message.
2. Based on your experience with a bank ATM, draw an activity diagram that models the data processing involved when a customer withdraws cash from the machine.
a cylinder of cross-sectional area a is divided inot tow chambers 1 and 2 by means of a frictionless piston. the piston
A simple Rankine cycle with water as the working fluid operates between the pressure limits of 15 MPa in the boiler and 100 kPa in the condenser. Saturated steam vapor enters a turbine. Irreversibilities in the turbine cause the turbine to be 70 perc..
magnetic tape is being fed over and around the two light pulleys which both rotate about fixed axes. if the speed v of
suppose that a steel of eutectoid composition is cooled to 550 degrees celcius from 760 degrees celcius in less than
100-kg of R-134a at 180kPa are contained in a piston-cylinder device whose volume is 14.715 cubic meter. The piston is now moved until the volume is one half its original sizes. This is done such that the pressure does not change. Determine the final..
a rigid tank contains 20 lbm of air at 20 psia and 70degf. more air is added to thenbsptank until the pressure and
An H2O boiler is designed to take 7000 lbm/hr in a steady-state process from saturated liquid at 1200 psi to an exit temperature of 900 degrees F. What is the required rate of heat transport for the boiler?
The refrigerant is now allowed to cool. Determine the pressure when the refrigerant first starts condensing. Also, show the process on a P-v diagram with respect to saturation lines.
a piston-cylinder device initially contains 0.07 m3 of nitrogen gas at 130 kpa and 120 oc. the nitrogen is now expanded
a bar of negligible mass fixed with a tip mass forms part of a machine used to punch holes in a sheet of metal as it
one mole of an ideal gas at t 25 degc is held in a cylinder by a piston at a pressure of 1 x 107 n m-2. the piston
a propeller drive shaft is to transmit 2500 hp at 75 rpm. it is to be made of aisi 1040 wqt 1300 steel. use a design
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