Beo Mg0 Al,0, MgO Al0, Cao TIO, UO, quartz
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- Following the Siebel's equation, what is the specific heat of a material with 85% moisture content? If the same material with a mass of 15kg is placed and heated inside a room with temperature of 25 deg Celcius, a resulting 45 deg Celsius change was observed in 15 minutes time. What is the specific heat, the total amount of heat absorbed and the rate of heat absorption of the material considering a linear case scenario? ASAP Answer only(a) The coefficient of thermal conductivity of zinc is two times that of copper and the length of copper rod is two times of the Zinc rod, then find the junction temperature. 20°C Zinc Copper O°C (b) How does the coefficient of thermal conductivity changes if (i) Temperature increases (ii) area of the material increases.2 of 4 I Review I Constants I Periodic Table In this problem you will estimate the heat lost by a typical house, assuming that the temperature inside is Tin = 20°C and the temperature outside is Tout = 0°C. The walls and uppermost ceiling of a typical house are supported by 2 × 6-inch wooden beams (kwood = 0.12 W/(mK)) with fiberglass insulation (kins = 0.04 W/(mK)) in between. The true depth of the beams is actually 5.625 inches, but we will take the thickness of the walls and ceiling to be Lwall = 18 cm to allow for the interior and exterior covering. Assume that the house is a cube of length L= 9.0 m on a side. Assume that the roof has very high conductivity, so that the air in the attic is at the same temperature Part A How much heat per second H (= Q/AT) is lost from the house due to heat conduction? Give your answer in watts, rounding to the nearest 10 W. » View Available Hint(s) Πν ΑΣφ as the outside air. Ignore heat loss through the ground. The effective thermal conductivity of…
- 1- A large slab of steel at a uniform tempering temperature of 200°C and suddenly quenching, and it surface temperature lowered to 70°C. calculate the required time when the temperature at a depth 4.0 cm has dropped to 120°C? Given: steel [k =45 W/m°C, a=1.4x10 m²/s, c=0.46 kJ/kg]A 44-mm diameter cylindrical steel specimen is to be heat treated such that the microstructure throu will be at least 50% martensite. We are to decide which of several alloys will satisfy this criterion if the quen medium is moderately agitated (a) oil, and (b) water. Cooling rate at 700°C (1300*F) Cooling rate at 700°C (1300°F) 7 "Fis 3.9 °Cs 305 125 56 33 16.3 10 305 125 56 33 16.3 10 7 "F/s 9 5.6 170 70 31 18 170 70 31 18 9 5.6 3.9 "Cs 100 100 Surface 75 75 Surface Center 50 Center Center 25 R Surface 10 30 mm 10 20 30 mm 1j in. 1 1 in. Equivalent distance from quenched end Equivalent distance from quenched end water quenching oil quenching Cooling rate at 700°C (1300°F) 490 305 125 56 33 16.3 10 5.1 3.5 °F/s 270170 70 31 18 60 2.8 2 °C/s 9 5.6 3.9 -100 50 4340 80 40 4140 8640 30 5140 1040 20 10 20 30 40 50 mm 1 1 1 2 in. 4. Distance from quenched end Hardness, HRC Diameter of bar (mm) 20 m14 Diameter of bar (in.) Diameter of bar (mm) 1/2 m/4 Percent martensite Diameter of bar (in.)In copper, what percentage of the volume change which occurs as the specimen is heated from room temperature to its melting point is due to the increased vacancy concentration, assuming that the vacancy concentration is just below the melting point (1083 oC) is 10-4. Given: Assume that the linear thermal expansion coefficient of copper is 16.5×10-6 K-1 over the whole temperature range.
- (a) Borosilicate glass bottles are processed into bottles using press and blow method shown Temperature ("F) in Figure 6(a). By referring to Figure 6(b), 400 800 1200 1600 2000 2400 2800 3200 1018 1016 Borosilicate i. State the suitable temperature range for making glass bottles and justify the glass 96% silica Fused 1016 glass silica 1014 Strain point answer. 1014 1012 Annealing point 1012 1010 H1010 ii. Discuss the process to relieve thermal stresses the glass bottles using Figure 6(b). 10 Softening point 10 106 Working range 105 10 i1i. Briefly discuss the consequence if the process in (ii) is not performed on the glass Working point 10 10 bottles. Melting point 102 Soda-lime glass 200 400 600 800 1000 1200 1400 1600 1800 Temperature ("C) iv. State THREE (3) reasons why glass would be the best material for the glass (a) (b) bottles? Figure 6. (a) Press and blow method and (b) temperature dependence of viscosity for various types of glasses Viscosity (Pa-s) Viscosity (P)using the potential well diagram discuss thermal expansion coefficient behavior of metals and ceramicsIn thermal conduction in ceramics and metals, which of the following statements are true? Select one or more: a. Phonons can have arbitrarily high and low energy b. A component of thermal energy is transmitted via phonons c. Phonons are a form of vibrational energy d. Phonons are amplified and strengthened by interaction with lattice defects e. Phonons are scattered and heat transfer reduced with interaction with lattice defects.
- One way to manufacture transistors, which amplify electricalsignals, is to diffuse impurity atoms into a semiconductormaterial such as silicon. Suppose a silicon wafer 0.1 cm thick,which originally contains 1 phosphorous (P) atoms for every 10million Si atoms, is treated so that there are 400 P atoms forevery 10 million Si atoms at the surface. Calculated theconcentration gradient (a) in atomic percent/cm and (b) inatoms/cm 3 ·cm. The lattice parameter of silicon is 5.4307 Å.Hint: Silicon isin a diamond cubicStructure with8 atoms/cell.Brittle Dune Buggy Parts A mechanic who was building a lightweight dune buggy needed some high-strength aluminum parts. Since he had access to a heat-treating furnace, he decided to do the solution heat-treating and aging process himself. He obtained 2024 aluminum bars and made the parts. Then her heat treated the part in a furnace to 1200 deg F., quenched them, and allowed them to age naturally. He noticed they had small blisters over their surfaces and when he began to hammer one in place, it broke in two places. What did he do wrong? Could the parts be salvaged in any way?Thermal conductivity is lower for (a) wood (b) air (c) water at 100°C (d)steam at 1 bar