Afertilizer producer finds that it can sell its product at a price of p= 3000 - 0.6x dollars per unit when it produces runits of fertilizer. The total production cost (in dollars) for xunits is Cir) 90.000 + 750r + 0.150r. if the production capacity of the firm is at most 1000 units of fertilizer in a specified time, how many units must be manufactured and sold in that time to maximize the profit? Selling units maximizes profit. Tethook and Mec

Afertilizer producer finds that it can sell its product at a price of p= 3000 - 0.6x dollars per unit when it produces runits of fertilizer. The total production cost (in dollars) for xunits is Cir) 90.000 + 750r + 0.150r. if the production capacity of the firm is at most 1000 units of fertilizer in a specified time, how many units must be manufactured and sold in that time to maximize the profit? Selling units maximizes profit. Tethook and Mec

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter1: Basic Modes Of Heat Transfer

Section: Chapter Questions

Problem 1.74P: A manufacturer in the United States wants to sell a refrigeration system to a customer in Germany....

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Using the information in Problem 1.22, estimate the ambient air temperature that could cause frostbite on a calm day on the ski slopes. 1.22 In order to prevent frostbite to skiers on chair lifts, the weather report at most ski areas gives both an air temperature and the wind-chill temperature. The air temperature is measured with a thermometer that is not affected by the wind. However, the rate of heat loss from the skier increases with wind velocity, and the wind-chill temperature is the temperature that would result in the same rate of heat loss in still air as occurs at the measured air temperature with the existing wind. Suppose that the inner temperature of a 3-mm-thick layer of skin with a thermal conductivity of 0.35W/mKis35C and the air temperature is 20C. Under calm ambient conditions the heat transfer coefficient at the outer skin surface is about 20W/m2K (see Table 1.4), but in a 40-mph wind it increases to 75W/m2K. If frostbite occurs when the skin temperature drops to about 10C, do you advise the skier to wear a face mask? What is the skin temperature drop due to the wind?
A manufacturer in the United States wants to sell a refrigeration system to a customer in Germany. The standard measure of refrigeration capacity used in the United States is the ton (T); a 1 T capacity means that the unit is capable of making about 1 T of ice per day or has a heat removal rate of 12,00 Btu/h. The capacity of the American system is to be guaranteed at 3 T. What is this guarantee in SI units?
A differential equation encountered in the vibration of beams is d4ydx4=2D where x = distance measured along the beam; [x]=[L] y = displacement of the beam; [y]=[L] = circular frequency of vibration; []=[T1] = mass of the beam per unit length; []=[ML1] D = bending rigidity of beam; [D]=[FL2] Show that the equation is dimensionally homogeneous. Note that [F]=[MLT2] see Eq. (1.21:).
Suppose we got the following data during a test of a 2- stroke engine in which gas is usedas a fuel:Diameter of the piston = 149 mmStroke length = 179 mmClearance volume = 0.88 literrpm of the engine = 302Indicated mean effective pressure = 6.0 barGas consumption = 6.0 m3/hCalorific value of the gas (fuel) = 16990 kJ/m3Make a clear sketch the geometry of this engine using the data and determine thefollowing:i. Indicated power developed by the engine in watt.ii. Air Standard Efficiencyiii. Indicated thermal efficiency of the engine.
QUESTION FIVE (a) At a certain location, wind is blowing steadily at 10 m/s. Determine the mechanical energy of air per unit mass and the power generation potential of a wind turbine with 60-m-diameter blades at that location. Take the air density to be 1.25 kg/m3. (b) Consider an alcohol and a mercury thermometer that read exactly 0°C at the ice point and 100°C at the steam point. The distance between the two points is divided into 100 equal parts in both thermometers. Do you think these thermometers will give exactly the same reading at a temperature of, say, 60°C? Explain.(c) Determine the work required to deflect a linear spring with a spring constant of 70 kN/m by 20 cm from its rest position.
The __________ is determined by dividing the quantity values by the pivot column values and selecting the minimum possible value or zero. a) artificial variable b) leaving variable c) slack variable d) entering variable
The below results are for cooling tower expirement, energy balance :energy balance of the system, that is to say, the energy taken by the air must be equal to the energy supplied by the water flow. Question : Discuss the tabulated cooling tower results... Discuss in detail format!
Show step by step solution. Use Mpa unit Sn = 7
For the following core plugs, gas floods were carried out using nitrogen. The oil produced from plugs 1 and 2 for the gas floods was 9.0 and 6.9 cm3, respectively. What is the residual oil saturation (Sorg) in these two plugs? Plug No. Initial Plug Saturations (%) ∅ Bulk Volume ρgrain ρo ρw ρg So Sw Sg (%) (cm3) (g/cm3) (g/cm3) (g/cm3) (g/cm3) 1 64.64 35.36 0 38.27 63.05 2.719 0.723 1.0216 0.001 2 71.93 28.07 0 34.63 51.05 2.724 0.723 1.0216 0.001
Differantial Equations
An air-cooled window DX unit is used for space cooling. The unit has a capacity of 4.5 tons and has a SEER of 15. If the unit operates for 2204 hours during the summer, how many kWh of electricity will be used? Hint: In the U.S., the SEER is the ratio of cooling in British thermal units (BTUs) to the electrical energy consumed in watt-hours. You may need to convert the unit in this process.
Show your complete solution to the questions given below. State all assumptions used during the Draw relevant figures, if necessary. Do not round off during your calculations. Unless otherwise specified, express your final answer/s to the nearest four decimal If it is a very small/very large number, express your final answer/s in scientific notation to the nearest two decimal places. Box your final answers. PROBLEM 5 A coke packed humidifier is to be designed to cool 3,000 cfm of saturated air from 150 to 75 °F at barometric pressure. Cooling water at 50°F will be allowed to heat up to 100°F. Gas velocity will be 3,000 lb of dry air per sq ft of total cross section. Water velocity is 1,200 lb/h per sq ft of total cross section. Over-all coefficient of sensible heat transfer from air to water = 300 BTU/h·ft3·°F. Calculate the height and diameter of cooling tower required. Round your answers to the nearest 0.05 ft. ANSWERS: Answer Maximum Points Actual Points…