2. Mr. Ahmed owns and operates a small business that provides economic consulting services. During the year he spends $ 55,000 on travel to clients and other expenses, and the computer that he owns depreciates by $ 2,000. If he didn’t use the computer, he could sell it and earn yearly interest of $ 100 on the money created through this sale. Mr. Ahmed’s total revenue for the year is $ 100,000. Instead of working as a consultant for the year, he could teach economics at a small local college and make a salary of $ 50,000.
i. What is Ahmed’s accounting profit?

ii. What is Ahmed’s economic profit?

Heat is added to a piston-cylinder device filled with 2 kg of air to raise its temperature 400 c from an initial temperature of t1 27 cand pressure of pi 1 mpa. the process is isobaric process. find a)-the final pressure p2 b)-the heat transfer to the air.

When using the ohmmeter function of a digital multimeter, the leads are placed in what position relative to the component being tested? a. parallel b. control c. series d. line

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?