Engineering, 11.12.2019 05:31 drdeb7766
Exercise 19.10 suppose you are given a relation r(a, b, c, d). for each of the following sets of fds, assuming they are the only dependencies that hold for r, do the following: (a) identify the candidate key(s) for r. (b) state whether or not the proposed decomposition of r into smaller relations is a good decomposition and briefly explain why or why not. 1. b --+ c, d --+ a; decornpose into bc and ad. 2. ab -+ c, c -~~ a, c d; decompose into a cd and be. ~~. a bc, c -+ ad; decornpose into abc and ad. 4. a b, b c, c '-1 d; decornpose into ab and a cd. 5. a --+ b, b -+ c, c d; decoinpose into ab, ad and cd.
Answers: 2
Engineering, 03.07.2019 15:10
Two flowing streams of argon gas are adiabatically mixed to form a single flow/stream. one stream is 1.5 kg/s at 400 kpa and 200 c while the second stream is 2kg/s at 500 kpa and 100 ? . it is stated that the exit state of the mixed single flow of argon gas is 150 c and 300 kpa. assuming there is no work output or input during the mixing process, does this process violate either the first or the second law or both? explain and state all your assumptions.
Answers: 1
Engineering, 04.07.2019 18:10
Afluid flows with a velocity field given by v=(x/t)i.. determine the local and convective accelerations when x=3 and t=1.
Answers: 2
Engineering, 04.07.2019 18:10
Which of the following ziegler nichols tuning methods the response of the controller to a step input should exhibit an s-shaped curve? a)-open loop mode b)-closed loop mode c)-both modes (open & closed) d)-none of the modes (open & closed)
Answers: 3
Engineering, 04.07.2019 18:20
The characteristic roots of a dynamic system are: 1.7920 1.8160 i, -1.7920 1.8160 i, -0.4160 what is the order of this system? what are the settling time and damping ratio of the system?
Answers: 3
Exercise 19.10 suppose you are given a relation r(a, b, c, d). for each of the following sets of fds...
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