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1.A three-point bending test is performed on a aluminum oxide specimen having a circular cross section of diameter 10.0 mm; the specimen fractured at a load of 3000 N when the distance between the support points was 40 mm. Another test is to be performed on a specimen of this same material, but one that has a square cross section of 15 mm in length. At what load would you expect this specimen to fracture if the support point separation is maintained at 40 mm?
2.In prestressing work, if more than one wire or strand is included in the same duct, why should all wires/strands be stressed at the same time?
3.The contractor ran out of gunite mixture and finished the deep corner of a 5-m-wide swimming pool, with a quarter circle pipe of PVC pipe, . compute the horizontal and vertical forces on the curved panel AB.
What force is necessary to lift a thin 25-mm diameter ring out of :
Solve the problem using the Darcy Weisbach equation and the Colebrook-White equation. Size the pipe to the nearest inch. Assume the water temp is 80 degrees F.
A thin tube of 1/8 in thickness has a mean diameter of 6 in. What is the maximum torque the tube can transmit if the allowable normalstress in compression is 10 ksi?
An aircraft has a glide ratio of 12 to 1. (glide ratio means that the plane drops 1m for every 12m it travels horizontally.) A building 45m high lies directly in the glide path to the runway.
What type of exercise takes place in a classroom setting arranged to look like an emergency operations center or in an actual emergency operations center, and involves simulation using written, telephone, and radio messaging.
Three particles are sliding along a flat, frictionless surface. mA = 0.4 kg, mB = 0.5 kg, and mC = 0.4 kg. Before any collisions take place, vA = 15i m/s, vB = 10im/s, and vC = 5 m/s. e = 0.85 between A and B and e = 0.6 between B and C.
An activated sludge tank, 30 x 30 x 200 ft, is designed as a plug-flow reactor, with an influent BOD of 200 mg/L and a flow rate of 1 million gallons per day. a. If BOD removal is first-order reaction, and the rate constant is 2.5 days^-1, what is ..
A heavy Machine is lowered into a pt by means of a rope wrapped around an 8" diameter stationary pole placed horizontally across the top of the pit. The coefficient of static friction for the rope on the pole is 0.35.
A 2500-lb automobile is moving at a speed of 60 mi/h when the brakes are fully applied, causing all four wheels to skid. Determine the time required to stop the automobile (a) on dry payment (u=0.75), (b) on an icy road(u=0.10).
A belt is wrapped around a pulley for 180 degrees. The loose-side belt tension is 100 lb and the coefficient of static friction is 0.30. Calculate the maximum belt tension if motion is impending.
Analyze the frame by moment distribution. Determine all reactions and draw the shear and moment diagrams, locating points of inflection and labeling max and min shear and moment values.
A 35 percent-efficient coal-fired power plant with effective height of 100 m emits SO2 at a rate of 0.6 lb/10^6 Btu into the plant. If winds are assumed to be 4 m/s at the stack height and just over 3 m/s at 10 m
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