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"(USCS units) fused deposition modeling is used to fabricate a part which is a model of the step pyramid at Sakkara in Egypt (built circa 2670 BCE). The model has six levels or steps, each with a thickness of 0.17 in. The bottom layer = 2.20 in on a side, and successive levels are 1.85, 1.50, 1.15, 0.80, and 0.45 in on a side, respectively. Height of the pyramid = 1.02 in. In the FDM process, layer thickness = 0.010 in and the width of the extrudate deposited on the surface = 0.025 in. The extruder head moves in the x-y plane at a speed of 10 in/sec. A delay of 12 sec is experienced between each layer to reposition the worktable. Compute an estimate for the time required to build the part. Setup time = 35 min. Ignore post-processing time. Using the time estimated to build the part, determine the part cost (in $) if the ABS polymer used in the process costs $9.50/lb and its density = 0.038 lb/in^3, machine hourly rate = $8.00/hr, and labor rate = $30.00/hr but labor will be used only 40% of the build time, mostly for setup."
air at 3x10-4 kgs and 27o c enters a rectangular duct that is 1 m long and 4 mm by 16 mm on a side. a uniform heat flux
A) Calculate the velocity in the tunnel test section. B) Compute the total pressure at the test section.
If water leaves the basement at 88C, determine the rate of heat loss from the weather.
Two girls standing 20 m apart are both throwing balls towards a tree to knock down a shoe hanging 7 m up in a tree that is directly between them. Girl A is 7 m from the tree while Girl B is 13 m from the tree.
There are three copper blocks, A, B, and C, containing 10 kJ of energy at 600 C, 200 C, and 100C, respectively, and a fourth iron block, D, containing 10 kJ of mechanical energy. (Thus, all devices have the same amount of energy.) The surrounding tem..
a beam of 2-mev photons with intensity 108 cm-2s-1 irradiates a small sample of water. a how many photons-water
A heat pump system is being designed to maintain a temperature of 25 0C when it is 0 0C outside. Assuming the heat transfer from the walls and roof is 4,000 MJ, determine the minimum theoretical net work input required if the cold reservoir was a) th..
an air-hockey puck has a mass of 0.01 kg and a diameter of 90 mm. when it is placed on the air table an air film of
a brother and sister are playing in the woods when suddenly the brother realizes that they are separated. the last
air flows through a well-insulated nozzle operating at steady state. at the inlet the pressure is 4 bar the temperature
a garden hose is open at one end and capped closed at the other. a swimmer in an above-ground pool fills the hose with
if the incoming nitrogen is at a pressure of 25 psi and temperature of 20oc and to flow 1200ft3hr. of nitrogen through
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