Chemistry, 10.10.2019 03:30 idontknow1993
An electric current of 1 a passing through a cable has a measured voltage of 30 v across the cable. the cable is covered with polyethylene insulation, and convection occurs at the outer surface of the insulation. the ambient temperature is 20°c with a convection heat transfer coefficient of 5 w/m2.k, and the surface area subjected to the convection is 0.1 m². the astm d1351 standard specifies that thermoplastic polyethylene insulation is suitable for use on electrical cable with operation at temperatures up to 75°c. under these conditions, will the polyethylene insulation for the cable meet the astm d1351 standard?
Answers: 2
Chemistry, 21.06.2019 22:30
Which feature do highland climates have that lower elevation areas do not?
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Chemistry, 22.06.2019 04:40
Silver tarnishes as silver metal reacts with hydrogen sulfide, h2s, in the air. in this reaction, dark silver sulfide, au2s, covers the surface of silver. when silver is polished, this coating of silver sulfide can be removed from the surface. this makes the silver shiny again. enter the coefficients that balance the tarnishing reaction equation. (type 1 for no coefficient.)
Answers: 2
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