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Derek has two choices for a heat-loss prevention system for the shipping doors at Kirkland Manufacturing. He can isolate the shipping department from the rest of the plant, or he can curtain off each shipping door separately. Isolation consists of building a permanent wall around the shipping area. It will cost S60 000 and will save $10 000 in heating costs per year. Plastic curtains around each shipping door will have a total cost of about S5000, but will have to be replaced about once every two years. Savings in heating costs for installing the curtains will be about S3000 per year. Use the payback period method to determine which alternative is better. Comment on the use of the payback period for making this decision.
If the fluid originates from a large tank with nearly zero velocity and flows vertically downward for its 2-m length, estimate the magnitudes of kinetic and potential energy changes. Assume the blood's properties are similar to those of water.
a crate containing 40 bricks each of mass 1.3kg is placed on a storage framework as shown.a calculate the reaction
Under what situations might you choose 3DESover AES? Under what situations might you chose AES over 3DES?
If the total entropy of the cell must be ten times its ground state value, what should the total energy of the cell be?
Why is the low-temperature endotherm for ambient pressure in Figure 31-10 found at the same temperature as that at 13.79 bar, whereas the high-temperature peaks for the two pressures are found at different temperatures?
How does the cost concept affect accounting for operating assets? Under this concept, what is included in the cost of a fixed asset?
A hot-air balloon of mass m is used to lift a load, Mg, by means of 12 equally spaced elastic ropes, each of stiffness k (see Fig. 5.60). Find the natural frequencies of vibration of the balloon in vertical direction. State the assumptions made in..
Liquid octane (C8H18) at 77F, 1 atm enters a combustion chamber operating at steady state and burns completely with 50% excess dry air entering at 120F, 1 atm. The products exit at 1060F, 1 atm. Determine the rate of heat transfer between combustion ..
Determine the specific flow availability of the air in the pipe when the local environment (ground state) is at 14.7 psia and 70.0°F.
The graph should be large-filling the page, so that details can be seen. Small graphs are not acceptable.
The C150 × 19:3 channel is used as a column with an effective length of 3 m. Determine the largest eccentricity e of the 14.5-kN load for which the maximum tensile stress does not exceed the maximum compressive stress. Use E = 200 GPa.
If an automobile's braking distance from 100 km/h is 60 m on level pavement, determine the automobile's braking distance from 100 km/h when it is (a) going up a 60 incline, (b) going down a 2-percent incline.
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