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The shaft in Figure P12-3 is part of a special machine designed to reclaim scrap aluminum cans. The gear at B delivers 5 hp to a chopper that cuts the cans into small pieces. The V-belt sheave at D delivers 3 hp to a blower that draws air through the chopper V-belt sheave E delivers 3 hp to a conveyor that raises the shredded aluminum to an elevated hopper The shaft rotates at 480 rpm. All power comes into the shaft through the chain sprocket at C. Use AISI 1137 OQT 1300 steel for the shaft. The elements at B, C, D. and E are held in position with retaining rings and keys in profile keyseats. The shaft is to be of uniform diameter, except at its ends, where the bearings are to be mounted. Determine the required diameter
A cantilever beam AB has a rectangular cross section and is loaded by a force P at an angle α that acts at the centroid of the cross section. Two strain gages are placed at point C, which is at mid-height of the beam. Gage D measures the strai..
A sample of clay was obtained from a point below the water table. An oven-drying test performed on this sample resulted in the following data:
A solid steel sphere with a specific gravity of 7.85 and diameter of 0.02 m is falling at its terminal velocity through water at 25 °C. Using either trial-and-error or a graphical approach, determine the velocity of the sphere
A sanitary landfill project needs an import soil for use as an impervious cap over the refuse. The design engineer desires a soil with a high clay content because it will help keep water out of the landfill.
The velocity out of the tube may be approximated by V = √(2(p-patm)/ρ), where p is the absolute tank pressure. Determine the time at which the pressure (gage) in the tank is 20 kPa if the initial pressure is 40 kPa (gage)
Determine the uniform flow depth in a trapezoidal channel with a bottom width of 8 ft and side slopes of 1 vertical to 2 horizontal. The discharge is 100 ft3/s. Manning roughness factor is 0.015 and the channel bottom slope is 0.004.
A critical problem in the design of thermoelectric refrigerators is the effective rejection of waste heat. Discuss how you can enhance the rate of heat rejection without using any devices with moving parts such as a fan.
A 405-n rightward force is used to drag a large box across the floor with a constant velocity of 0.678ms. The coefficient of friction between the box and the floor is 0.795. Determine the mass of the box.
Submarines change their depth by adding or removing air from rigid ballast tanks, thereby displacing seawater in the tanks. Consider a submarine that has a 700m3 air-ballast tank originally partially filled with 100m3 of air at 1500 kPa and 15oC. For..
A drinking water treatment plant will be designed to process a flow of 15,000 m3/d. The sedimentation tank will have a residence (detention) time of 4 hours and the overflow rate (Q/A) of 16 m 3 /m 2 -day. Estimate the required surface area (A), an..
The beam is to be hoisted using two chains. Determine the magnitudes of force and acting on each chain in order to develop a resultant force of 500 directed along the positive axis. Set = 41
An outdoor track is 125m in diameter. A runner increases her speed at a constant rate from 4 to 7 m/s over a distance of 30m. Determine the magnitude of the total acceleration of the runner 2 s after she begins to increase her speed.
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