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Why we use a number of antimony-bismuth couple in a thermopile?
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- Water expands significantly when it freezes: a volume increase of about 9% occurs. As a result of this expansion and because of the formation and growth of crystals as water freezes, anywhere from 10% to 30% of biological cells are burst when animal or plant material is frozen. Discuss the implications of this cell damage for the prospect of preserving human bodies by freezing so that they can be thawed at some future date when it is hoped that all diseases are curable.Post-Lab Question: You are asked to construct a 1.00kg cube made of aluminum, and a 1.00kg cube made of brass. What side length should each cube have to produce the desired mass of 1.00kg?The equation of state for g of oxygen at a pressure P, and temperature T, when occupying a volume V, will be? a) PV = (5/32)RT b) PV = 5RT c) PV = (5/2)RT d) PV = (5/16)RT
- What is the value for a mole ————x 10 2 ?The wall of a house consists of an outer layer of brick, coated with cement and a layer of plaster on the inside. The corresponding thicknesses are xbrick. Xcement and Xplaster respectively and are given below. The thermal conductivities of brick, cement and plaster are as follows: kbrick = 0.6 Wm-1K-1 Kcement = 1.0 Wm-1K-1 Kplaster = 2.0 Wm-1K-1 Calculate the thermal resistances per unit area for: Brick= Cement = Plaster = KW-1 KW-1 KW-1 The temperatures are given below (Tin and Tout). Write your numerical answers to the appropriate level of precision. HINT: Use an area of 1m2. Make sure you convert to Sl units. Then calculate the heat current through the wall per unit area. The units for this are Wm-2. Just write your numerical answer rounded to the nearest whole number in the box below:Please explain how (dH/dS)N,P = T and what the value of (dS/dN)H,P is for a monoatomic ideal gas.
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- Car manufacturers are developing engines that use H2 asfuel. In Iceland, Sweden, and other parts of Scandinavia, wherehydroelectric plants produce inexpensive electric power, the H2 can be made industrially by the electrolysis of water(a) How many coulombs are needed to produce 3.5x10^6L of H2 gas at 12.0 atm and 25°C? (Assume the ideal gas law applies.)(b) If the coulombs are supplied at 1.44 V, how many joules areproduced?(c) If the combustion of oil yields 4.0x10^4kJ/kg, what mass ofoil must be burned to yield the number of joules in part (b)?Consider a region of the atmosphere of volume 25 decimeters cubed, which at 30 degrees Celsius contains about 1.0 mol of molecules. Take the average molar mass of the molecules as 29 g/mol and their average speed as about 400 m/s. Estimate the energy stored as molecular kinetic energy in this volume of air.Steel coated with a thin layer of ceramic to help protect against corrosion. What do you expect to happen to the coating when the temperature of steel is increased significantly? Explain this behavior and relate it with the role of the bonding energy of the atoms.