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A new packaging machine will save Greene Cheese Pty. Ltd. $3000 per year in reduced spoilage, $2500 per year in labour, and $1000 per year in packaging material. The new machine will have additional expenses of $700 per year in maintenance and $200 per year in energy. If it costs $20 000 to purchase, what is its payback period? Assume that the savings are earned throughout the year, not just at year-end.
A cylindrical electric resistance heater has a diameter of 1cm and length of 0.25m. When water at 30oC flows across the heater a heat-transfer coefficient of 15W/(m2oC) exists at the surface. If the electrical input to the heater is 5W, what is the s..
Your perfectly reliable friend, Frank, asks for a loan and promises to pay back $150 two years from now. If the minimum interest rate you will accept is 8%, what is the maximum amount you will loan him?
What is the color code of the equivalent resistance?
an air-standard diesel cycle operates with a compression ratio of 18. at the beginning of the compression process the
A 50 x 50 cm duct is 10 m in length. Nitrogen enters at M1 = 3.0 and leaves at M2 = 1.7, with T2 = 280 K and P2 = 7 x 104 N/m2. Find the static and stagnation conditions at the entrance.
oxygen o2 gas within a piston-cylinder assembly undergoes an expansion from a volume v1 0.01 m3 to a volume v2 0.03
Explain why the in-plane (in the plane of the cylinder wall) shear stress is not the maximum shear stress?
Compute the pressure produced in the oil in a closed cylinder by a piston exerting a force of 2500 lb on the enclosed oil. The piston has a diameter of 3.00 in.
determine the time needed for the velocity to become v=vf. initially the particles falls from rest.
a jet of water leaves the nozzle at the end of a hose. the area and absolute pressure inside the hose are a1 and p1 and
Suppose that the duct's square cross-section is 0.3 m by 0.3 m and the effective outside heat transfer coefficient is 5 W/m2K in still air. Determine whether condensation occurs.
the automobile shown has 1200kg mass with center of gravity at point g and all wheel have the same 0.34m radius if the
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