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A two-spindle drill simultaneously drills a 1/2-in hole and a 3/4-in hole through a workpiece that is 1.0 in thick. Both drills are twist drills witb point angles of 1180. Cutting speed for the material is 230 ft/min. The rotational speed of each spindle can be set, individually. The feed rate for both holes must he set to the same value because the two spindles lower at the same rate. The feed rate is set so the total metal removal rate does not exceed 1.50 ins/min. Determine
(a) the maximum feed rate (in/min) that can be used,
(b) the individual feeds (in/rev) that result for each hole, and
(c) the time required to drill the holes.
A 50-kg iron block at 80C os dropped into an insulated tank that contains 0.5m^3 of liquid water at 25C. determine the temperature when thermal equilibrium is reached.
friction on the concrete surface creates a couple moment of 100 Mm on the blades of the trowel. Determines the magnitude of the resultant couple forces so that the resultant couple on the trowel is zero
A thin wire ring, 3 cm in diameter, is lifted from a water surfaceat 20 C (DEGREE CENTIGRADE). Neglecting the wire weight, what isthe force required to lift the ring? is this a good way to measuresurface tension? should the wire be made of any partic..
If the aircraft flies at 9000 m standard altitude, make a plot of drag (in N) versus speed (from stall to 240 m/s) and determine the optimum emise velocity (minimum drag per unit speed).
The bar AB has an axial rigidity of EA. The bar is rigidly attached at A while there is a gap at B. A load P acts at point C and has a large enough magnitude to close the gap at B.
A cylinder/piston contains 1 kg methane gas at 100 kPa, 300 K. The gas is compressed reversibly to a pressure of 800 kPa. Calculate the work required if the process is adiabatic.
The dissolved oxygen of sample water is 1.5 mg/L. At 25 C, the dissolved oxygen of the dilution water is 8.25 mg/L. You are told the BOD5 of the sample is 130 mg/L. You have a target final dissolved oxygen of 3.0 mg/L
Compute the design strengths of a rectangular beam with bw=15 in, d = 36 in, d'=2.5 in, fy= 60ksi, fc'=4ksi, and at the top of the beam are 4 #8 bars, the bottom has two rows of 4 #10 beams
On a shovel/truck operation the production of the shovel is 293 BCY/h and a job efficiency of 0.75. The trucks used have a capacity of 12 BCY and have a cycle time of 45 min.(excluding loading).
Water leaves a reservoir at 0.05 m^3/s through a 200-mm riveted steel pipeline that protrudes into the reservoir and then immediately turns a 90º bend with a local (minor) loss coefficient equal to 0.3.
The company would like to distribute the songs between the two CDs such that the used space on each CD is about the same. Formulate the problem as an IP, and find the optimal solution.
derive expressions for the strain energy density
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