For the last 10 years, Am-Mex Coal has used the cost depletion factor of $2,500 per 100 tons to write off the investment of $38 million in its Pennsylvania anthracite coal mine. Depletion thus far totals $24.8 million. A new study to appraise mine reserves indicates that no more than 910,000 tons of salable coal remains. The estimated gross income is expected to be $8.8 million on a production level of 72,000 tons. Determine next year’s depletion amount. The percentage depletion allowance is 10%. (Enter your answer in dollars and not in millions.)The next year's depletion amount is $

Explain the difference laminar and turbulent flow. explain it with the shear stress and the velocity profiles.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Different types of steels contain different elements that alter the characteristics of the steel. for each of the following elements, explain what the element does when alloyed with steel.