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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.
A hollow steel cylinder is to be used as a torque-sensing device. The maximum torque that will be applied is 30 N-m. If the dimensions of the cylinder are L = 18 cm, ri = 2.6 cm, and r0 = 2.8 cm, calculate the maximum angular deflection that will b..
Water flows through a 2 cm diameter pipe at 1.6 m/s. Calculate the Reynolds numberand find also the velocity required to give the same Reynolds number when the pipe istransporting air. For the water the kinematic viscosity was 1.31*10^-6 m^2/s and th..
An air-cooled condenser is rated at 40 tons will be installed at an elevation of 5000 ft (1640 m) above sea level. The manufacturer advises a correction factor of 0.89 at an altitude of 5000 ft (1640 m). Determine the condenser rating at this elev..
The engine of my go-cart has circular fins, 3 mm thick that are machined into the aluminium of the cylinder (k=240 W/m*K) such that the outer diameter of the cylinder itself (not including the fins) is 10 cm and the fins stick out from the cylinder b..
in the movie eraser the bad guys had a gun that would shoot a 5 g aluminum slug at one quarter the speed of light. lets
Saturated Steam is to be condensed on the shell side of a heat exchanger at 75°F. Cooling water enters the tubes at 50°F at a rate of 45 lbm/s and leaves at 65°F. Assuming the heat exchanger to be well-insulated, determine the rate of heat transfer i..
isooctane is supplied to a four-cylinder spark-ignition engine at 2gs. calculate the air flow rate for stoichiometric
Calcium Silicate has replaced asbestos as the preferred insulation for steam lines in power plants. Consider a 40 cm O.D., 4 cm wall thickness steel steam line insulated with a 12 cm thickness of calcium silicate. The insulation is protected from dam..
a certain industrial process requires a steady stream of saturated vapor steam at 200 kpa at the rate of 2 kgs. there
an elevator weighing 1000lb is carrying a load of 500 lb and descending at 20 fts. the cable supporting the
If the stress limit is 240 MN/m2 and the modulus of elasticity of steel is 2x1011 N/m2, calculate the safe load if the length of the column is 8 m with a safety factor of 1.75?
a 20-kg uniform cylindrical roller initially at rest is acted upon by a 90-n force as shown. knowing that the body
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