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Stripping overburden in the Illinois coal belt, the Dusty Coal Company uses 270-horsepower, track-type tractors (with direct-drive transmissions) and drawn scrapers. The overburden is a very soft loam that weighs 2,800 lb/yd (loose). Estimated RR factor for the haul road is 300 lb/ton. If the scraper weighs 35,000 lb (empty) and carries 25 loose cubic yards per trip, what is the RR of the loaded unit? What operating gear and speed do you estimate for the loaded machines on level ground?
The top and bottom pull to the left with 10 kips each, the middle part 20 kips to the right. The bolts have a diameter 3/8 inch, determine the average shear stress on the bolt surfaces that are subjected to direct shear.
A plumber places his hands 18 inches apart on a pipe threader and can push (and pull) with 80 lb of force. What couple moment does he exert? How much could he exert if he moved his hands to the ends so that his hands are 254 inches apart?
With a safety factor of two on the time, determine the maximum static stress the component must sustain in order to have a service life of 10000 hours.
The transportation agency would like to determine the maximum spacing of stations to allow trains to arrive no more than 5 minutes apart. 1. Draw a time-space diagram depicting the above scenario
Crates A and B weigh 240lb and 250lb , respectively. They are connected together with a cable and placed on the inclined plane If the angle theta is gradually increased.
Each month the speedy dry Cleaning company buys 1 barrel (0.160 m^3)of dry cleaning fluid . Ninety percent of the fluid is lost to the atmosphere and 10 percent remains as residue to be disposed of
design a horizontal curve with a 40-degree central angle ( delta = 40) for a two-lane road with 11-ft lanes. The design speed is 70 mi/h and superelevation is limited to 0.06 ft/ft. Give the radius, degree of curvature, and length of curve that yo..
At point D, Fred measured the distance to point E, the final point, to be 405.27 ft. The noon whistle sounded (you may have to have a little "small town" in you to appreciate the noon whistle), so they left in a hurry without measuring the angle C..
A 1,000 L water tank contains 1,200 moles of an experimental chemical that is a weak acid with pka of 7.2. The PH of the tank is 9.0. what is molar concentration of the chemical that will dissolve in the water at PH 9.0
To study mixing of the stream and river, a conservative tracer is to be added to Tin Pot Run. If the instruments that measure the tracer can detect a concentration of 1.0 mg/L, what minimum concentration must be achieved
The beam over a 3ft wide outside door is to be concrete to support the brickwork above the door. The moment has been calculated to be 4005in-Ibs and the beam is 4 inches wide and 6 inches overall height.
Find: LOS and speed within the ramp influence area and the outer freeway lanes (one-ramp is followed by off-ramp)
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