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A nanowire was grown in 36 hours inside a furnace at 773 K.The diameter of the...
Metal bearings with diameter of 10 mm are initially at equilibrium at 400?C in a furnace....
Metal bearings with diameter of 10 mm are initially at equilibrium at 400?C in a furnace. At t = 0 the bearings are removed from the furnace and cooled slowly in air with h = 150 W/m2K and temperature of 20?C to control the mechanical properties of the metal. Calculate the time required for the center of the sphere to reach a temperature of 335?C. Thermophysical properties are ? = 3000 kg/m3 , k = 20 W/m·K, and c =...
36. What is the diameter of the wire in question 35 in millimeters? (a) 12.7 mm...
36. What is the diameter of the wire in question 35 in millimeters? (a) 12.7 mm (b) 14.2 mm (c) 18.87 mm (d) 21.4 mm 37. Calculate the square mil area of a bus bar 4 in, thick and 34 in. wide. (a) 123,800 sq mils (b) 187,500 sq mils (c) 210,500 sq m 29 732 38. What is the circular mil area of the bus bar in question 37? (a) 238,732 (b) 110,423 (c) 289,000 (d) 542,216 39. Calculate...
Answer choice A, E, and F ARE WRONG A 12 gauge wire has a diameter of...
Answer choice A, E, and F ARE
WRONG
A 12 gauge wire has a diameter of 2.05 mm. The wire is coiled 20 times to form a solenoid. If 255 mA of current runs through the wire, what is the magnitude magnetic field inside the wire? O A. 1.31 x 10^-7 T OB. 0.105 T O C. 2.09 T O D. 1.56 x 10^-4 T XO E. 5.10 T O F. 6.41 x 10^-6 T
P.1.9. A bar of mild steel has a diameter of 75 mm and is placed inside...
P.1.9. A bar of mild steel has a diameter of 75 mm and is placed inside a hollow aluminum cylinder of internal diameter 75 mm and external diameter 100 mm; both bar and cylinder are the same length. The resulting composite bar is subjected to an axial compressive load of 1000 KN. If the bar and cylinder contract by the same amount, calculate the stress in each. The temperature of the compressed composite bar is then reduced by 150°C but...
(a) A low-loss coaxial cable is required for a 100 MHz project. The diameter of the...
(a) A low-loss coaxial cable is required for a 100 MHz project. The diameter of the inner conductor (copper, σc = 5.7×107 S/m) and the outer diameter of the dielectric to be 2 mm and 7.75 mm, respectively. The dielectric inside this cable is XLPE polyethylene (εr = 2.2, σ = 2.5×10-6 S/m). Please calculated the per-unit-length inductance and per-unit-length conductance; (b) Find the characteristic impedance and its phase constant; (c) A two-wire transmission line is used instead where an...
Water flows inside a smooth tube with a diameter of 25 mm. Its mean flow velocity...
Water flows inside a smooth tube with a diameter of 25 mm. Its mean flow velocity is 3.0 m/s. The tube is held at a temperature that is 20◦C above the water temperature. The water enters the tube at 30◦C. What is the tube length so that the water’s exit temperature is 60◦C. Please write clearly so i can read it. Also whoever keeps answering this, let someone else answer.
Silicon carbide nanowires of diameter D - 20 nm can be grown onto a solid silicon...
Silicon carbide nanowires of diameter D - 20 nm can be grown onto a solid silicon carbide surface by carefully depositing droplets of catalyst liquid onto a flat silicon carbide substrate. Silicon carbide nanowires grow upward from the deposited drops, and if the drops are deposited in a pattern, an array of nanowire fins can be grown forming at silicon carbide nano-heat sink. Consider finned and unfinned electronics packages in which an extremely small, 10m x 10 m electronics device...
A wire with a length 68 cm and a diameter of 9.0 cm is made of...
A wire with a length 68 cm and a diameter of 9.0 cm is made of an unknown material that has a temperature coefficient α of 4.6 x 10^(-3) C^(-1)°. At 20 C°, a voltage difference of ΔV is applied to the ends of the wire, and a power output of 18.7 watts is measured. If the diameter of the wire triples, the length halves, and the temperature increases to 50 C°, what will be the new power output across...
Problem 2: A stainless steel rod (k-21 W/m-K, p-8000 kg/m3, C,,-570 J/kg-K) with diameter D-10 mm is heat-treated as it...
Problem 2: A stainless steel rod (k-21 W/m-K, p-8000 kg/m3, C,,-570 J/kg-K) with diameter D-10 mm is heat-treated as it passes through a furnace at a speed of 2 cm/s. The furnace has a convection coefficient of 80 W/m2-K and an air temperature of 900°C. The furnace is 3 m long, and the stainless steel enters at 20°C. (a) Using a control volume of length S traveling with the rod, develop a differential equation for the rate of change of...
Chapter 18, Problem 18.03 XIncorrect. A gold wire 4.0 mm in diameter is to offer a resistance of ...
Chapter 18, Problem 18.03 XIncorrect. A gold wire 4.0 mm in diameter is to offer a resistance of no more than 15 Ω. Using the data in Table 18.1, compute the maximum wire length Table 18.1 Room-Temperature Electrical Conductivities for Nine Common Metals and Alloys Metal Silver Copper Gold Aluminum Brass (70 Cu-30 Zn) Electrical Conductivity [(a-m ] 6.8 x 10 6.0 x 10 4.3 x 10 3.8 x 10 1.6 x 10 1.0 x 10 0.94 x 107 0.6...
36. What is the diameter of the wire in question 35 in millimeters? (a) 12.7 mm (b) 14.2 mm (c) 18.87 mm (d) 21.4 mm 37. Calculate the square mil area of a bus bar 4 in, thick and 34 in. wide. (a) 123,800 sq mils (b) 187,500 sq mils (c) 210,500 sq m 29 732 38. What is the circular mil area of the bus bar in question 37? (a) 238,732 (b) 110,423 (c) 289,000 (d) 542,216 39. Calculate...
Answer choice A, E, and F ARE
WRONG
A 12 gauge wire has a diameter of 2.05 mm. The wire is coiled 20 times to form a solenoid. If 255 mA of current runs through the wire, what is the magnitude magnetic field inside the wire? O A. 1.31 x 10^-7 T OB. 0.105 T O C. 2.09 T O D. 1.56 x 10^-4 T XO E. 5.10 T O F. 6.41 x 10^-6 T
P.1.9. A bar of mild steel has a diameter of 75 mm and is placed inside a hollow aluminum cylinder of internal diameter 75 mm and external diameter 100 mm; both bar and cylinder are the same length. The resulting composite bar is subjected to an axial compressive load of 1000 KN. If the bar and cylinder contract by the same amount, calculate the stress in each. The temperature of the compressed composite bar is then reduced by 150°C but...
Silicon carbide nanowires of diameter D - 20 nm can be grown onto a solid silicon carbide surface by carefully depositing droplets of catalyst liquid onto a flat silicon carbide substrate. Silicon carbide nanowires grow upward from the deposited drops, and if the drops are deposited in a pattern, an array of nanowire fins can be grown forming at silicon carbide nano-heat sink. Consider finned and unfinned electronics packages in which an extremely small, 10m x 10 m electronics device...
Problem 2: A stainless steel rod (k-21 W/m-K, p-8000 kg/m3, C,,-570 J/kg-K) with diameter D-10 mm is heat-treated as it passes through a furnace at a speed of 2 cm/s. The furnace has a convection coefficient of 80 W/m2-K and an air temperature of 900°C. The furnace is 3 m long, and the stainless steel enters at 20°C. (a) Using a control volume of length S traveling with the rod, develop a differential equation for the rate of change of...
Chapter 18, Problem 18.03 XIncorrect. A gold wire 4.0 mm in diameter is to offer a resistance of no more than 15 Ω. Using the data in Table 18.1, compute the maximum wire length Table 18.1 Room-Temperature Electrical Conductivities for Nine Common Metals and Alloys Metal Silver Copper Gold Aluminum Brass (70 Cu-30 Zn) Electrical Conductivity [(a-m ] 6.8 x 10 6.0 x 10 4.3 x 10 3.8 x 10 1.6 x 10 1.0 x 10 0.94 x 107 0.6...
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