One year ago, your company purchased a machine used in manufacturing for $120,000. You have learned that a new machine is available that offers many advantages and that you can purchase it for $140,000 today. The CCA rate applicable to both machines is 40%; neither machine will have any long-term salvage value. You expect that the new machine will produce earnings before interest, taxes, depreciation, and amortization (EBITDA) of $50,000 per year for the next 10 years. The current machine is expected to produce EBITDA of $24,000 per year. All other expenses of the two machines are identical. The market value today of the current machine is $50,000. Your company's tax rate is 45%, and the opportunity cost of capital for this type of equipment is 11%. Should your company replace its year-old machine? What is the NPV of replacement? The NPV of replacement is $ (Round to the nearest dollar.)

(a) Calculate the power per square meter reaching Earth’s upper atmosphere from the Sun. (Take the power output of the Sun to be 4.00×1026W.) (b) Part of this is absorbed and reflected by the atmosphere, so that a maximum of 1.30 kW/m2 reaches Earth’s surface. Calculate the area in km2 of solar energy collectors needed to replace an electric power plant that generates 750 MW if the collectors convert an average of 2.00% of the maximum power into electricity. (This small conversion efficiency is due to the devices themselves, and the fact that the sun is directly overhead only briefly.) With the same assumptions, what area would be needed to meet the United States’ energy needs (1.05×1020 J)? Australia’s energy needs (5.4×1018 J)? China’s energy needs (6.3×1019 J)? (These energy consumption values are from 2006.)

What is the average power consumption in watts of an appliance that uses 6.62 kW · h of energy per day? How many joules of energy does this appliance consume in a year?

A book on a shelf has potential energy of 200J and two times the mass of a book next to it. What is the GPE of the smaller book?