Engineering, 14.02.2020 05:16 alexis3567
Consider the voice mail application presented in Chapter 2. A new requirement is added to the system: A mailbox owner can erase all messages in the queue from a specific phone number without having to listen to any of them. The mailbox owner would enter the sender's phone number on the phone keypad and the system will delete all messages sent from that phone. (information that may be relevant for this problem: assume the caller ID is available for all incoming messages) a. Write the use case for this new feature. Add also one variant for an unsuccessful scenario. Make these scenarios integrate nicely with the other voice mail system use cases. b. Write the sequence diagrams for the 2 new scenarios. (see pages 72-73)
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Engineering, 03.07.2019 14:10
Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.
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Engineering, 04.07.2019 18:10
Abrake has a normal braking torque of 2.8 kip in and heat-dissipating cast-iron surfaces whose mass is 40 lbm. suppose a load is brought to rest in 8.0 s from an initial angular speed of 1600 rev/min using the normal braking torque; estimate the temperature rise of the heat dissipating surfaces.
Answers: 3
Engineering, 04.07.2019 18:10
Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86
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Engineering, 04.07.2019 18:20
Atank with constant volume contains 2.27 kg of a mixture of water phases (liquid-vapor). in the initial state the temperature and the quality are 127 °c and 0.6, respectively. the mixture is heated until the temperature of 160 oc is reached. illustrate the process in a t-v diagram. then, determine (1) the mass of the vapor in kg at the initial state, (2) the final pressure in kpa.
Answers: 3
Consider the voice mail application presented in Chapter 2. A new requirement is added to the system...
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