List and describe three methods of heat transfer.  Give an example of each. (1) Method? Example? (2) Method? Example? (3) Method? Example?

2. In an experiment to measure the thermal conductivity of beef was formed into a square section block 5 cm x 5 cm and 1 cm thick. The edges of the block were insulated, and heat was supplied continuously to one face of the block at a rate of 0.80 W. The temperatures of each face were measured with thermocouples and found to be 28.5°C and 23.3°C, respectively. What is the thermal conductivity of beef?

Derive the equation that gives the heat transfer rate at steady conditions for a sphere with inside diameter r1 outside diameter r2 and r1/r2 ratio 1.5. Repeat the same process for a cylinder with inside diameter r1 outside diameter r2 and r2/r1 ratio 5 and both systems Compare the heat transfer rates you obtained for

Consider the tea kettle in Example 2.10. Suppose that the kettle holds 1 kg of water (about 1 liter) and that the flame impinges on 0.02 m? of the bottom. (a) Find out how fast the water temperature is increasing when it reaches its boiling point, and calculate the temperature of the bottom of the kettle immediately below the water if the gases from the flame are at 500°C when they touch the bottom of the kettle. Assume that the heat capacitance of the aluminum kettle is negligible. (b) There is an old parlor trick in which one puts a paper cup of water over an open flame and boils the water without burning the paper (see Experiment 2.1). Explain this using an electrical analogy. [(a): dT[dt = 0.36°C/s.]