Metal spheres, 10 mm in diameter, are to be annealed by heating them to 827°C then allowing them to cool slowly in air at 27°C to the point where they are in thermal equilibrium with the air. 2000 balls are annealed in one hour’s time. What is the total rate of their heat transfer if they are made of steel, lead, or copper?

Write the method with formula explanation and working steps Write down the formula and explanation and the equation

SOLVE STEP BY STEP IN DIGITAL FORMAT The SOLFIES company is dedicated to welding any type of metal, but especially aluminum parts. If the aluminum pieces that are welded come out at 1200°C and to speed up the cooling they are immersed in a tank full of water with a temperature of 0°C. In this case, the heat is transferred from the welded part to the water, causing the temperature to begin to decrease. Taking into account the temperature data of both the piece and the water, in addition to the value of the constant K= 0.02, it is necessary to know how long it takes for the piece to reach a temperature of 20°C in order to handle it and deliver it to the customer. MATH MODEL T'+KT=Tm Solve this differential equation with Euler's numerical method.

What is a solid solution? In general, what is its implication on the mechanical behavior of metals (i.e., increase or decrease in strength)?

80 kg of aluminum is to be heated to a pouring temperature of 750°C. The unit melting and pouring energy of the metal = 1035 J/g. Thermal efficiency of the furnace = 65%. How much time is required to heat the metal from 25°C to the pouring temperature if the electric induction furnace generates 100 kW? p x T = 21.23 min

In a thin-walled cylindrical pressure vessel, the axial and circumferential joint efficiencies specified to account for fabrication process and inspection procedure considerations are 1.0 and 0.5 respectively. The ratio between the circumferential stress and axial stress used in the design is, O a. 4:1 O b. 1:1 Oc. 2:1 O d. 1:2

For the 21.5-cm thick multilayer assembly as listed below, please estimate the temperature on the interface between material layers 3 and 4 Material layers - counted from the interior side: (1) 1.5 - cm gypsum board; (2) 4.0-cm - concrete of density - 2400-kg/m3; (3) 10-cm of XPS foam; (4) 6.0-cm - concrete of density - 2400-kg/m3 Interior film resistance is Ri = 0.121 m2K/W Exterior film resistance is Re - 0.029 m2K/W Internal temperature +20 degC   External Temperature - 20 degC All necessary material properties can be found in the ASHRAE Handbook of Fundamentals, or other sources