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Pernavik Dairy produces and sells a wide range of dairy products. Because most of the dairy's costs and prices are set by a government regulatory board, most of the competition between the dairy and its competitors takes place through advertising. The controller of Pernavik has developed the sales and advertising levels for the last 52 weeks. These appear in the file P11_61.xlsx. Note that the advertising levels for the three weeks prior to week 1 are also listed. The controller wonders whether Pernavik is spending too much money on advertising. He argues that the company's contribution-margin ratio is about 10%. That is, 10% of each sales dollar goes toward covering fixed costs. This means that each advertising dollar has to generate at least $10 of sales or the advertising is not cost-effective. Use regression to determine whether advertising dollars are generating this type of sales response.
A water cooled compressor with air flowing at 0.1 kg/s enters at a temperature of 27C. The compressor work is 5 kW and the heat transfer rate to the water is 2kW. Use air as an ideal gas (Cp = 1.006 kJ/kg-K). Ignore changes in KE and PE.
After scaling a wall, a thief drops 3-m to the ground if his body comes to a complete stop 0.15s after his feet touch the ground determine the vertical component of the average impulsive force exerted on his feet increases from zero by the square of ..
How is the mechanical deformation energy defined? How do you calculate the work of fracture of a brittle material?
Determine the equilibrium temperature of a flat piece of the coated aluminum that is exposed to solar irradiation, GS = 1368 W/m2 on its upper surface. The opposite surface is insulated.
heat in the amount of 100 kj is transferred directly from a hot reservoir at 1200 k to a cold
a circular specimen of mgo is loaded using a three-point bending mode. compute the minimum possible radius of the
in a process in which ball bearings are produced steel ball bearings of .9 cm diameter are quenched by dropping them at
a 3 m x 3 m x 2.4 m room losses heat through the walls at a rate of 520 w. determine the final temperature of the room
refrigerant 134a at -10degc 1.4 bar and a mass flow rate of 280 kghr enters an insulated compressor operating at steady
a large power plant requires two pumps in the circulating water system. each pump is rated at 515 m3min when producing
What happens to the cutting and thrust force as tool rake angle and cutting speed are increased and what is the relation between the cutting and thrust forces to the depth of cut?
a piston-cylinder device contains 1m3 liquid water of saturated liquid water at 200 c. the water is expanded
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