The replacement of a laser cutting machine is being considered. The best available machine on market has an estimated economic life of 12 years with an equivalent annual worth of S-24.800. The current used machine, which was bought six years ago for $48.000, has a present market value of $4,000 with the following data for the next three years Estimated Market Value at End of Year, S OC Year S per Year 20,000 3,000 25,000 2,500 30,000 2,000 Select when to replace the machine, using Economic Service Life method at an interest rate of 4% per year. O ) Replace now b) Replace in year one c) Replace in year two d) Replace in year three
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- Calculate the time for 10 per cent of the sites on a (100) tungsten surface with a bec unit cell and a lattice constant of 316 pm to be covered with nitrogen at 298K when the pressure is 2 x 10 mmHg and the sticking probability is 0.55Suppose that a healthy population of some species is growing in a limited environment and that the current population P0 is fairly close to the carrying capacity M0. You might imagine a population of fish living in a freshwater lake in a wilderness area. Suddenly a catastrophe such as the Mount St. Helens volcanic eruption contaminates the lake and destroys a significant part of the food and oxygen on which the fish depend. The result is a new environment with a carrying capacity M1 considerably less than M0 and, in fact, less than the current population P0. Starting at some time before the catastrophe, sketch a “before-and-after” curve that shows how the fish population responds to the change in environment.My colleagues have conducted an accelerated stability study on a new pharmaceutical protein formulation. They observed a degradation rate of 20% per week at 40°C and a rate of 4% per week at 35°C. What rate can be expected at 25°C?
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