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A contractor has both a 3-cy and a 5-cy shovel in the equipment fleet. Select the minimum-size shovel that will excavate 400,000 bcy of common earth in a minimum of 130 working days of 8 hr each. The average height of excavation will be 15 ft, and the average angle of swing will be 120°. The 3-cy shovel has a maximum digging height of 30 ft and the 5-cy machine's maximum digging height is 34 ft. The efficiency factor will be a 45-min hour. Appropriate-size haul units can be used with either shovel. How many days will it require to complete the work?
The ball at A is kicked such that theta=30 degrees. If it strikes the ground at B having coordinates x=15 ft, y= -9ft, determine the speed at which it is kicked and the speed at which it strikes the ground.
A tank containing acetone at 20 oC has a drain pipe connected vertically at the bottom. The pipe is made of galvanized iron, 0.5 in NPS Schedule 40 with length L= 2m. The acetone depth in the tank is H= 5 m.
If a truck has a capacity of 24m^3 (Heaped) and 18m^3 (struck), with a total empty weight of 31600kg (truck), and needs to move soil at a density of 1850kg.m^3 (Bank) with a swell of 41%
The pipe has a flow of 5 m3/s. The stream's chloride concentration just upstream of the pipe's dischage is 12 mg/L, and the runoff pipe's discharge has a chloride concentration of 40 mg/L. Chloride is a conservative substance.
At equilibrium, the air space has a volume of 1 L, a total pressure of 1 atm, and a temperature of 298 K. The i mg of formaldehyde (HCHO, MW = 30 g/mol) is injected through the septum into the water.
The air transport B is flying with a constant speed of 480 mi/hr in a horizontal arc of 9-mi radius. When B reaches the position, aircraft A, flying south-west at a constant speed of 360 mi/hr
You are the winner of a sweepstakes and given a choice of a one-time payment of $1,000,000 or a guaranteed $80,000 per year for 20 years. Assume that you will collect all 20 years regardless of health condition.
Consider a cantilever mass-less beam subjected to a concentrated mass at the tip of the beam. Assume, length L, flexural stiffness EI, and mass m.
given s=.30/(60-u), where s is the spacing (space headway) in miles, and u is the speed in miles per hour, derive the relationships u-k, u-q, and q-k. Also, estmate the capacity (qmax) of the roadway.
The beam is subjected to a force F=825 lb in the direction, and is supported by a pin connection at point B and a rope attached through a pin connection at point A. Problem #1: Draw a complete FBD of the beam.
calculate the cracking moment (resisting moment) for an unreinforcedconcrete beam that is 10 in. wide, 16 in. high. assume normal weight concrete with 3000 psi = f prime sub c. use the internal couple method and check with the flexure formula.
A 1600 ft long sag verical curve (equal tangent) has a pvc at station 1200+00 and elevation o 1500 ft. the initial grade is -3.5% and the final grade is 6.5%. determine the elevation and stationing of the low point, pvi and pvt.
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