Acryogenics laboratory uses liquid nitrogen to store biological samples. the liquid nitrogen is transferred to the storage freezer through a small cylindrical tube. the liquid nitrogen has a constant temperature of -196 °c, and the copper tube has a 1.5 cm outside diameter and a thickness of 0.21 cm. it is coated with a layer of insulating soft vulcanized rubber that is 0.57 cm thick. the convective heat transfer coefficient for the liquid nitrogen is 144 w/m²k, and air on the outside of the insulation has a bulk temperature of 27 °c and a convective heat transfer coefficient of 62 w/m -k. a. what is the heat flux across the tube at the inside surface of the copper tube? what is the heat flux across the tube at the outside surface of the rubber? (be sure to include a direction with your answers) b. what is the temperature on the outside of the copper tube, next t you may look up the thermal conductivities of copper at 200k and rubber at 300k. you may also assume that the temperature of the liquid nitrogen does not change appreciably from the entrance to the exit.
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Chemistry, 22.06.2019 02:30
24 points and brainliest to anyone who can answer under 10 minutes with best ! the table below shows the role of different substances during photosynthesis. substance role during photosynthesis glucose stores chemical energy water combines with glucose to form carbon dioxide chlorophyll traps sunlight which of the following statements would correct one of the roles listed in the table? glucose combines with carbon to form water. chlorophyll reacts with light to produce carbon dioxide. water combines with carbon dioxide during photosynthesis. chlorophyll stores chemical energy needed for photosynthesis.
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Chemistry, 22.06.2019 18:10
Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)
Answers: 1
Chemistry, 23.06.2019 00:10
Find the missing probability in the table below a.0.10 b.40 c.0.80 d. 0.20
Answers: 2
Acryogenics laboratory uses liquid nitrogen to store biological samples. the liquid nitrogen is tran...
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