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- Determine the resistance of an aluminium coil of 1.3 cm as diameter consists of 13100 turns and the mean length per turn is 44 cm. Take the electrical resistivity aluminium coil as 0.017 μΩ–m. The area in cm2 = The total length in m = The resistance of the coil in Ω =A brick wall 3 m high, 7.5 m wide, and 160 mm thick has a thermal conductivity of 0.7 W/(m.°C). The temperature on the inner face is 25°C, and the temperature on on the outer face is 0° C. How much heat is lost per day through the wall? (Express your answer using three significant figures.) Q = kJ O- Icon KeyA wire of radius 1 mm and conductivity 5x [10] ^7 S/m if an electric field of 5 mV/m is applied. Determine the current in the wire * 0.943 0.628 0.785 O 0.393
- 1. please write clean and as much detail as you can 2. please draw the FBD since I am not understanding the temperature placement on this question 3. to make your job easier the following formula apply : Q_cond=Q_conv+Q_radi KA(T_i-T_o )/L=hA(T_s-T_∞ )+ε σ A(T_s^4-T_∞^4 )A high-density polyethylene [E = 128 ksi; α= 88 x 10-6/°F; υ = 0.4] bar is positioned between two rigid supports. The bar is square with cross-sectional dimensions of 2.50 in. by 2.50 in. and length L = 48 in. At room temperature, a gap of Δ=0.25 in. exists between the block and the rigid support at B. After a temperature increase of 120°F, determine: a) The normal stress in the bar b)The lonitudinal strain in the bar. c)The transverse (ie lateral) strain in the bar.At a temperature of 60°F, a 0.05-in. gap exists between the ends of the two bars shown. Bar (1) is an aluminum alloy [E = 10,000 ksi; v = 0.32; α=α=12.5 x 10-6/°F] bar with a width of 2.9 in. and a thickness of 0.80 in. Bar (2) is a stainless steel [E = 28,000 ksi; v = 0.12; α=α=9.6 x 10-6/°F] bar with a width of 1.9 in. and a thickness of 0.80 in. The supports at A and C are rigid. Assume h1=2.9 in., h2=1.9 in., L1=28 in., L2=42 in., and Δ=Δ= 0.05 in. Determine(a) the lowest temperature at which the two bars contact each other.(b) the normal stress in the two bars at a temperature of 255°F.(c) the normal strain in the two bars at 255°F.(d) the change in width of the aluminum bar at a temperature of 255°F. Determine the lowest temperature, Tcontact, at which the two bars contact each other.
- At a temperature of 60°F, a 0.03-in. gap exists between the ends of the two bars shown. Bar (1) is an aluminum alloy [E = 10,000 ksi; v = 0.32; α=α=12.5 x 10-6/°F] bar with a width of 3.0 in. and a thickness of 0.70 in. Bar (2) is a stainless steel [E = 28,000 ksi; v = 0.12; α=α=9.6 x 10-6/°F] bar with a width of 1.9 in. and a thickness of 0.70 in. The supports at A and C are rigid. Assume h1=3.0 in., h2=1.9 in., L1=27 in., L2=47 in., and Δ=Δ= 0.03 in. Determine(a) the lowest temperature at which the two bars contact each other.(b) the normal stress in the two bars at a temperature of 260°F.(c) the normal strain in the two bars at 260°F.(d) the change in width of the aluminum bar at a temperature of 260°F.At a temperature of 60°F, a 0.03-in. gap exists between the ends of the two bars shown. Bar (1) is an aluminum alloy [E = 10,000 ksi; v = 0.32; α=α=12.5 x 10-6/°F] bar with a width of 3.0 in. and a thickness of 0.70 in. Bar (2) is a stainless steel [E = 28,000 ksi; v = 0.12; α=α=9.6 x 10-6/°F] bar with a width of 1.9 in. and a thickness of 0.70 in. The supports at A and C are rigid. Assume h1=3.0 in., h2=1.9 in., L1=27 in., L2=47 in., and Δ=Δ= 0.03 in. Determine:Current Attempt in Progress Thetemperature of a Pyrexdisk is changed from 14.2°C to 62.8°C. Its initial radius is 8.76 cm; its initial thickness is 0.59 cm.Take these data as being exact. What is the change in the volume of the disk? Assume a = 3.2x10/c". Number Units This ariswer ha5 no units * (degrees) m kg Attempts: 0ot Save for Later m/s mis2 N kgm/s or Ns N/m*2 or Pa m*3 times
- (a) A wire carrying a 20.5 A current passes between the poles of a strong magnet that is perpendicular to its field and experiences a 2.46 N force on the 3.75 cm of wire in the field. What is the average field strength? Average field strength in tesla = (b) A spherical surface of area 0.7m2, emissivity 0.85 and temperature 134°C is placed in a large, evacuated chamber whose walls are maintained at a fixed temperature. Find the rate at which radiation is emitted by the surface?( Stefan's constant σ = 5.67 x 10-8 W/m2T4 ) Energy radiated per second in watts =Determine the resistance of a copper wire that has a cross-sectional area as 7.3 mm2. The length and the electrical resistivity of the copper wire are 78.6 m and 1.78 x 10 6 Qm. The resistance of a copper wire (in Q). A thermocouple is a temperature-measurement device that consists of two dissimilar metal wires joined at one end. An oversimplified diagram follows. Metal 1 ΡOTENTIOMΕΤER V(mV) Metal 2 A voltage generated at the metal junction is read on a potentiometer or millivoltmeter. When certain metals are used, the voltage varies linearly with the temperature at the junction of the two metals: V(mV) = aT(°C) +b An iron-constantan thermocouple (constantan is an alloy of copper and nickel) is calibrated by inserting its junction in boiling water and measuring a voltage V = 5.27 mV, and then inserting the junction in silver chloride at its melting point and measuring V = 24.88 mV. (a) Derive the linearequation for V(mV) in terms of T(°C). Then convert it to an equation for T in terms of V. (b) If the thermocouple is mounted in a chemical reactor and the voltage is observed to go from 10.0 mV to 13.6 mV in 20 s, what is the average value of the rate of change of temperature, dTldt, during the…