Engineering, 09.10.2019 03:20 pindu
A10-in-thick., 30-ft-long, and 10-ft-high wall is to be constructed using 9-in-long solid bricks (k = 0.40 btu/h·ft·°f) of cross section 7 in × 7 in, or identical size bricks withnine square air holes (k = 0.015 btu/h·ft·°f) that are 9 inlong and have a cross section of 1.5 in× 1.5 in . there isa 0.5- in-thick plaster layer (k = 0.10 btu/h·ft·°f) between twoadjacent bricks on all four sides and on both sides of the wall. the house is maintained at 80°f and the ambient temperature outside is35°f. taking the heat transfer coefficients at the inner andouter surfaces of the wall to be 1.5 and 6 btu/h·ft2·°f. respectively, determine the rate of heat transfer through the wall constructed of(a) solid bricks and (b) bricks with air holes.
Answers: 2
Engineering, 04.07.2019 18:10
Water at the rate of 1 kg/s is forced through a tube with a 2.5 cm inner diameter. the inlet water temperature is 15°c, and the outlet water temperature is 50°c. the tube wall temperature is 14°c higher than the local water temperature all along the length of the tube. what is the length of the tube?
Answers: 3
Engineering, 04.07.2019 18:20
An engine runs on the ideal diesel cycle. the cycle has a compression ratio of 20 and a cutoff ratio of 2. the highest temperature in the cycle is 1200 k. if the heat into the system is 300 kj/kg of working fluid and using variable specific heats determine the work produced per mass of working fluid
Answers: 3
Engineering, 04.07.2019 19:10
The short distance from the objective lens to the object causes problems at high magnification. which of the following is the most serious? a. cleaning the object surface b. positioning the object c. reflection from the object surface. d. illumination of the object
Answers: 1
Engineering, 04.07.2019 19:10
When subject to a steady load (within elastic range) over a long period of time, what is the major difference in material behavoir between steel and plastic?
Answers: 2
A10-in-thick., 30-ft-long, and 10-ft-high wall is to be constructed using 9-in-long solid bricks (k...
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