3. A new factory is to be established to produce reinforcement bars for the construction industry. This will require an initial investment of Birr 10 million. It is expected that after three years of operation an additional investment of Birr 5 million will be required; and after six years of operation, another investment of Bill 3 million. Annual operating costs will be Birr 3 million and annual revenues will be Birr 8 million. The life of the plant is 10 years. If the interest rate is 15% per year, compounded annually, a. what is the NPV of this plant?

b. Is it a worthy investment? Why?

If a particle moves along a path such that r : (3 sin t) m and ? : 2t rad, where t is in seconds. what is the particle's acceleration in m/s in 4 seconds? a)- 16.43 b)- 16.29 c)- 15.21 d)- 13.79

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.