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Consider a small but known volume of metal that has a large thermal conductivity.
(a) Since the thermal conductivity is large, spatial temperature gradients that develop within the metal in response to mild heating are small. Neglecting spatial temperature gradients, derive a differential equation that could be solved for the temperature of the metal versus time T(t) if the metal is subjected to a fixed surface heat rate q supplied by an electric heater.
(b) A student proposes to identify the unknown metal by comparing measured and predicted thermal responses. Once a match is made, relevant thermophysical properties might be determined, and, in turn, the metal may be identified by comparison to published property data. Will this approach work? Consider aluminum, gold, and silver as the candidate metals.
Complete a thermodynamic analysis of the system using the approximation of constant specific heats. Determine T5, T6, T7, m·2, and Q·int (the internal heat transferred within the heat exchanger)
Discuss the impact of velocity on the state of stress during static failure analysis for a fixed position of input. Is there a practical significance behind considering the COM of the rider offset from point E? What differences do you expect to ob..
an ideal gas has a constant-pressure specific heat of 2.20 kjkgk and a molar mass of 16.04. eight kilograms of the gas
1) An ideal Rankine cycle which uses water as the working fluid operates its condenser at 40oC and its boiler at 300oC. The mass flow rate of steam entering the turbine is 100 kg/s. Determine the following;
a 16 kg mass of copper is dropped into an insulated tank which contains water at 20oc and 1 bar. the initial
Air enters a nozzle steadily at 2.21 kg/m^3 and 30 m/s and leaves at 0.762 kg/m^3 and 180 m/s. If the inlet area of the nozzle is 80 cm^2 determine a) The mass flow rate through the nozzle and b) The exit area of the nozzle.
an automotive radiator cools glycerine from 95 degrees c to 55 degrees c air flows through it entering at 20 degrees c
An insulated rigid tank contains 5 kg of helium gas at 440 kPa and 31C. A valve is now opened, and helium is allowed to escape until the pressure inside drops to 200 kPa. Assuming the helium remaining inside the tank has undergone a reversible, adiab..
hyundai advertises a 10 year-100000 mile power-train warranty for its cars. you work for a competitor and want to see
At a temperature of 21°C, a cold-rolled red brass [alpha B = 17.6 x 10-6/°C] sleeve has an inside diameter of dB = 314.70 mm and an outside diameter of DB = 325 mm. The sleeve is to be placed on a steel [alpha S = 11.9 x 10-6/°C] shaft with an outsid..
a long pryoceram rod with a diameter of 80mm is clad with a very thin metallic tube for protection. the bonding between
If the pressure differential between the outlet and inlet of the pump is measured to be 5 kPa and the changes in velocity and elevation are negligible, determine the maximum possible volume flow rate of gasoline.
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