Engineering, 15.11.2019 05:31 erincnw9939
(20 pts) air enters a convergent-divergent nozzle at 20 × 105 n/m2 and 40 ◦c. the receiver pressure is 2 × 105 n/m2 and the nozzle throat area is 10 cm2 . (a) what should the exit area be for the design conditions above(i. e.,to operate at third critical? ) (b) with the nozzle area fixed at the value determined in part (a) and the inlet pressure held at 20 × 105 n/m2 , what receiver pressure would cause a shock to stand at the exit? (c) what receiver pressure would place the shock at the throa
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Engineering, 04.07.2019 18:10
Coiled springs ought to be very strong and stiff. si3n4 is a strong, stiff material. would you select this material for a spring? explain.
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Engineering, 04.07.2019 18:10
Apipe with an outside diameter of 15 cm is exposed to an ambient air and surrounding temperature of -20°c. the pipe has an outer surface temperature of 65°c and an emissivity of 0.85. if the rate of heat loss from the pipe surface is 0.95 kw per meter of length, the external convective heat transfer coefficient (h) is: (a) 12.5 w/m"k (b) 18.6 w/mk (c) 23.7 w/mk (d) 27.9 w/mk (e) 33.5 w/mk
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Engineering, 04.07.2019 18:20
Describe one experiment in which the glass transition temperature and melting temperature of a totally amorphous thermoplastic material can be determined. show the relevant experimental results in a diagram which should be properly annotated with the two temperatures clearly marked. what is likely to happen to the curve in the diagram if the amorphous polymer is replaced by a thermosetting type?
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Engineering, 04.07.2019 19:10
With increases in magnification, which of the following occur? a. the field of view decreases. b. the ambient illumination decreases. c. the larger parts can be measured. d. the eyepiece must be raised.
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(20 pts) air enters a convergent-divergent nozzle at 20 × 105 n/m2 and 40 ◦c. the receiver pressure...
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