A hot just-minted gold coin is places 210 g of water to cool. The water initial temperature is 25° C. After a couple minutes the system water-coin reach a temperature of 33° C. What is the mass of the coin? The specific heat capacity of the Gold is 129 J/kg•°C, show your procedure.​

Name three different units of energy used to measure heat and describe what type of situations each is usually used.

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Asheet of steel 1.5 mm thick has nitrogen atmospheres on both sides at 1200oc and is permitted to achieve a steady-state diffusion condition. the diffusion coefficient for nitrogen in steel at this temperature is 6 x 10- 11 m2 /s, and the diffusion flux is found to be 1.2 x 10-7 kg/m2 -s. also, it is known that the concentration of nitrogen in the steel at the high-pressure surface is 4 kg/m3 . how far into the sheet from this high-pressure side will the concentration be 2.0 kg/m3 ? assume a linear concentration profile.