QUESTION 3-A Sales of industrial vacuum cleaners at R. Lowenthal Supply Co. over the past 13 months are as follows: SALES($1,000s) MONTH August September TITE SALES($1000s) MONTH January February 11 14 14 17 16 March 12 October 10 April 14 November 15 Мay 16 December 17 June 11 January jo back to bn 11 July eing m (a) Using a moving average with three periods, determine the demand for vacuum cleaners for next February. (b) Using a weighted moving average with three periods, determine the demand for vacuum cleaners for February. Use 3, 2, and 1 for the weights of the most recent, second most recent, and third most recent periods, respectively. For example, if you were forecasting the demand for February, November would have a weight of 1, December would have a weight of 2, and January would have a weight of 3. (c) Use exponential smoothing with a constant of 0.2 to forecast the demand for vacuum cleansers for January to February. (d) Evaluate the accuracy of each of these methods (Compute the MAD and MSE)) oback His

QUESTION 3-A Sales of industrial vacuum cleaners at R. Lowenthal Supply Co. over the past 13 months are as follows: SALES($1,000s) MONTH August September TITE SALES($1000s) MONTH January February 11 14 14 17 16 March 12 October 10 April 14 November 15 Мay 16 December 17 June 11 January jo back to bn 11 July eing m (a) Using a moving average with three periods, determine the demand for vacuum cleaners for next February. (b) Using a weighted moving average with three periods, determine the demand for vacuum cleaners for February. Use 3, 2, and 1 for the weights of the most recent, second most recent, and third most recent periods, respectively. For example, if you were forecasting the demand for February, November would have a weight of 1, December would have a weight of 2, and January would have a weight of 3. (c) Use exponential smoothing with a constant of 0.2 to forecast the demand for vacuum cleansers for January to February. (d) Evaluate the accuracy of each of these methods (Compute the MAD and MSE)) oback His

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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The data provided by a water bottling company for the year 2020 to carry out Break Even Analysis and provide them the results, is as follows. The fixed cost of the year is 9000.0 R.O The estimated sales are 2200000 units The cost of water treatment / unit 12 baize The cost of bottling / unit 08 baize The cost of labelling / unit 08 baize The cost packing / unit 10 baize The cost of labour and maintenance / unit 20 baize The cost of 1 liter bottle (plastic bottle) 12 baize Each unit is sold at price 95 baize Construct the B.E.P chart on a graph sheet and indicate M.o.S, B.E.P and also indicate the new B.E.P, & M.o.S after the improvement measures has been taken and show all mathematical calculations. 1. Determine the B.E.P 2. Determine the profit 3. Margin of safety. 4. Write your decisions to improve the profits of the company and to reduce the B.E.P
3. At a load of 43,000 KW in a steam turbine generating set, 3600 RPM, the following data appear in the log sheet. Steam flow -190 Metric Tons/hour Steam pressure - 8.93 MPaa Steam temperature - 535C Feed-water temperature - 230 C Fuel Flow: Bunker Oil -3.4 Metric Tons/hr HHV=10,000 Kcal/hr Local coal -18 Metric Tons/hr HHV = 5350 Kcal/hr Determine the overall boiler efficiency. h at 8.93 MPa and 535°C -3475.7 KJ/kg hf at 230°C-990.12 KJ/kg
11 Sunco Oil has refineries in Los Angeles and Chicago.The Los Angeles refinery can refine up to 2 million barrelsof oil per year, and the Chicago refinery up to 3 million.Once refined, oil is shipped to two distribution points:Houston and New York City. Sunco estimates that eachdistribution point can sell up to 5 million barrels per year.Because of differences in shipping and refining costs, theprofit earned (in dollars) per million barrels of oil shippeddepends on where the oil was refined and on the point ofdistribution (see Table 51). Sunco is considering expandingthe capacity of each refinery. Each million barrels of annualrefining capacity that is added will cost $120,000 for the LosAngeles refinery and $150,000 for the Chicago refinery. Uselinear programming to determine how Sunco can maximizeits profits less expansion costs over a ten-year period.
13 - A fixed volume insulated tank, which was initially empty, was connected by a valve to a distribution line carrying helium gas at a temperature of 125ºC. The valve is opened first and closed when the pressure is the same as the distribution line pressure. What is the final internal energy of helium in the tank? (Internal energy of the warehouse in the final state = Enthalpy of the distribution line). (Cp=5.1926) will be taken. a) 701.0 kJ/kg B) 649.1 kJ/kg NS) 2014.7 kJ/kg D) 2118.6 kJ/kg TO) 2066.7 kJ/kg
M2(Izy.Z– ly-y) + M,(1z.z – lzy-y) 1z.ly - Izy? Pr Мy Formüller; o =- • Oy = Oz + Oy o - ạ0p + o < oỷ , Jort = , Tmaks 2 Pr •02 = 2 2t 2 Çelik Og + Oy Te d²y_M(x) Omaks.min + τ , ε αΔΤ, τ,. EI MalanıcoXc , @pjc EI 2 Malanıpc 2000 mm ) + ry tejp = Tmaks = EI Bakır ƏM dx. Pgr VQ M It If a copper ring with an outer diameter of 2000 mm and a thickness of 20 mm and a steel ring with an inner diameter of 2000 mm and a thickness of 10 mm are intertwined and heated up to 100 °C; a) Calculate the maximum stress in the steel ring. b) Calculate the pressure exerted by the copper ring on the steel ring. Copper = Ebakır= 100 GPa, abakıF 16.10-6/°C Steel = Eçelik= 200 GPa açelik= 12.10-6/ºC
15 - A fixed volume insulated tank, initially empty, was connected to a distribution line carrying helium gas at a temperature of 135ºC by means of a valve. The valve is opened first and closed when the pressure is the same as the distribution line pressure. What is the final internal energy of helium in the tank? (Internal energy of the warehouse in the final state = Enthalpy of the distribution line). (Cp=5.1926) will be taken. a) 701.0 kJ/kg B) 597.1 kJ/kg NS) 2014.7 kJ/kg D) 2066.7 kJ/kg TO) 2118.6 kJ/kg
3. The U.S. auto industry produces approximately 6 million vehicles a year, each containing roughly 1.5 metric tons of fabricated metal. Consider a future wind-turbine industry having half of the auto industry's mass throughout of wind turbine units. Each unit has a specific weight of 75 kg/kW rated (nacelle components plus tubular tower only). a. At a wind-turbine capacity factor of 0.3, how long would it take to replicate the 2008 U.S.-installed average electric power rating of 1035 GW? b. Discuss (5-10 sentences) the relevant factors that would determine whether a wind machine industry of this size could be successfully operated sustainably over periods on the order of several centuries.
28. The edges of a cast iron block weighing 32 kg were rounded off with a mill. When the block was reweighed, it was found to weigh only 29,5 kg. What percentage of the original cast iron block was lost? A. 7.8% В. 8.5% С. 3.4% D. 2.5% 29. If 3.5 L of used oil were to be disposed of each week over a three-year period, the total number of liters disposed of at the end of this time, assuming there are 52 weeks in a year, would be A. 495 L В. 546 L
B) An engine with an indicated thermal efficiency of 50% and mechanical efficiency of 45% consumes 15kg/h of a fuel at a fixed speed. The brake mean effective pressure is 6.5 bar and the mean piston speed is 13m/s. Assuming it is a four cylinder four- stroke square engine, determine the crank radius and the speed in rpm. Take the heating value of the fuel =42MJ/kg and combustion efficiency 100%.
32 - A fixed volume insulated tank, initially empty, was connected to a distribution line carrying helium gas at 115ºC by means of a valve. The valve is opened first and closed when the pressure is the same as the distribution line pressure. What is the final internal energy of helium in the tank? (Internal energy of the warehouse in the final state = Enthalpy of the distribution line). (Cp=5.1926) will be taken. a) 2014.7 kJ/kg B) 649.1 kJ/kg NS) 2118.6 kJ/kg D) 2066.7 kJ/kg TO) 597.1 kJ/kg
20. A regenerative braking system stores kinetic energy of a car so that it can be recovered when the vehicle resumes moving. One way to do this is to “store” the energy in a spinning flywheel. One such design uses a solid disk flywheel with moment of inertia 0.040 kg m2 and maximum rotation rate 45000 rpm. (a) What is the maximum energy storage? (b) In principle it could store the kinetic energy of a 1700 kg car moving at what speed before braking? (c) If this energy is used to start the car moving again in 10.0 s, what is the power output of the system?
Item 10 A house is heated and maintained at 20 °C by a heat pump. Part A Determine the maximum possible COP if heat is extracted from the outside atmosphere at (a) 10 °C, (b) 0 °C, (c) –10 °C, and (d) -40 °C. Express each COP numerically to three significant figures, separated by commas. ΑΣφ vec COP10 °C, COP, oc, COP 10 °c, COP 40 °c = Submit Request Answer