Engineering, 18.09.2019 05:30 layshjjbradshaw7250
The roof of a car in a parking lot absorbs solar radiation at a rate of 800 w/m2 . the convection coefficient between the roof and the ambient air is 12 w/m2 /k, and the ambient air temperature is 20oc. you may assume that the underside of the car roof is perfectly insulated. a. find the steady-state temperature of the roof neglecting radiation exchange with the surroundings. b. recalculate the steady-state temperature of the roof if the ambient air conditions are identical but now its surface emissivity is 0.8 and you must consider radiation exchange. hint: you can take the sky as surroundings with a temperature of 0ok.
Answers: 2
Engineering, 04.07.2019 18:10
Carbon dioxide gas expands isotherm a turbine from 1 mpa, 500 k at 200 kpa. assuming the ideal gas model and neglecting the kinetic and potential energies, determine the change in entropy, heat transfer and work for each kilogram of co2.
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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 18:10
Aturning operation is performed with following conditions: rake angle of 12°, a feed of 0.35 mm/rev, and a depth of cut of 1.1 mm. the work piece is aluminum alloy 6061 with t6 heat treatment (a16061-t6). the resultant chip thickness was measured to be 1.0 mm. estimate the cutting force, fc. use shear stress of 207 mpa and coefficient of friction on the tool face of 0.6.
Answers: 1
Engineering, 06.07.2019 03:20
What is the maximum height from which a mass of 30 kg can fall on to a flange on the lower end of a vertical rod of length 1.0 m and diameter 20 mm, the upper end being rigidly fixed, if the stress in the rod is not to exceed 80 mpa? the tensile modulus of the rod is 200 gpa.
Answers: 3
The roof of a car in a parking lot absorbs solar radiation at a rate of 800 w/m2 . the convection co...
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