A concrete mix with a 3-inch slump, w/c ratio of 0.50 and a sand with a fine modulus of 2.4 contains 1700 lb/cubic yard of coarse aggregate. Compute the required weight of coarse aggregate per cubic yard. To adjust the mix so as to increase the compressive strength, the water-to-cement ratio is reduced to 0.45. Will the quality of the coarse aggregate increase, decrease, or stay the same? Explain your answer.

Determine the minimum size of the pad footing for a steel : A geotechnical report has suggested an allowable bearing pressure of 200kPa. Determine the minimum size of the pad footing for a steel column if a factor of safety of 2.0 is recommended (include an estimate of self weight of the footing in your calcu.. |

General systems theory encourages us to use a holistic : The evaluation of various possible scenarios (either future or past) using simulation models can be tremendously valuable as a tool used in strategic plan development. |

Why you think the actual volume pumped in a real clean : A cylindrical volume of soil contaminated with trichloroethylene (TCE). It is about 2.5 m deep and about 4.0 m in diameter. The porosity of the soil is approximately 0.25. |

Estimate the time between when the concentration ratios : A conservative tracer is applied to the ground surface and leached through the vadose zone by rainfall. The average volumetric water content is 0.40 over the upper 4 meters and 0.30 over the remaining 3 meters above the water table |

Compute the required weight of coarse aggregate per cubic : A concrete mix with a 3-inch slump, w/c ratio of 0.50 and a sand with a fine modulus of 2.4 contains 1700 lb/cubic yard of coarse aggregate. Compute the required weight of coarse aggregate per cubic yard. |

Determine the minimum size of the pad footing 2 meters wide : A geotechnical report has suggested an allowable bearing pressure of 200kPa. Determine the minimum size of the pad footing 2 metres wide for a steel column if a factor of safety of 2.0 is recommended |

Estimate the amount of coal needed to light one 100-w : A 25-W compact fluorescent lightbulb (CFL) produces the light equivalent of a 100-W incandescent bulb. The population of North America is estimated to be about 305 million. Estimate the amount of coal needed to light one 100-W incandescent lightbulb |

Calculate the hydraulic conductivity of silica sand : A constant-head permeability test was conducted on a sample of fine silica sand. The cross-sectional area of the sample was 60 cm2 and its length was 150 mm. |

Calculate the horizontal scale factor and effective : The foundation soil for an earth dam has a horizontal hydraulic conductivity of 1.5 x 10-9 m/s and a vertical hydraulic conductivity of 1 x 10-10 m/s. It is proposed to estimate the seepage flow rate through the foundation soil using the flow net ske.. |

## What area in square feet does the drum cover per hourEarth whose in situ weight is 110 lb per cf and compacted weight is 124 lb per cf is placed ina a fill at rate of 280 cy per hr, measured as compacted earth. The thickness of the compacted layers is 8 in. |

## What is the difference in water levels between reservoirsA wrought iron water line connecting two reservoirs at 20°C has a length of 1500 m, a diameter of 75 cm, two elbows (90º, long-radius, flanged), a fully open gate valve, and a reentrant pipe entrance. |

## What is the capacity of the runway in aircraft per hourA runway used for landing only is used by two types of aircraft, one with an airspeed of 120 knots (nautical miles/hr) and the other with an airspeed of 150 knots. The length of common approach path is 6 nautical miles. |

## Determine what weight of oxygen was put in the tankWhen the ambient air is at 70 degrees Fahreneit, 14.7 psia, and contains 21% oxygen by volume, 4.5 lb of air are pumped into a scuba tank, capacity 0.75 ft^3. What volume of ambient air was compressed |

## How to use design chart for r for grade 60 reinforcementSelect the number and size of reinforcing bars required to resist a total factored moment of 180 ft. kips for a rectangular section with b = 12 in., d = 19.5 in., h = 24 in., f'c = 4 ksi, and fy = 60 ksi. |

## Compute the convective heat transfer coefficentWater at a flow rate of 1 kg/s is flowing in a pipe of internal diameter 5 cm. If the inside pipe surface temperature is 90 degrees C and mean bulk water temperature is 50 degrees C |

## What is the recommended clear zone distanceWhat is the recommended clear zone distance for the following roadway situations? (Use the Clear Zone nomograph to find solutions) |

## How far does each skater travelIf they pull themslevles along the the rope until they meet how far does each skater travel? B)If only the 45 kg skater pulls along the rope until she meets her friend( who just holds onto the rope) how far does each skater travel? |

## Find the probability that is drawn marble is only whiteTwo marbles are drawn in succession from the box containing 10 red, 30 white, 20 blue, and 15 orange marbles. replacement being made after each drawing. Find the probability that is: (a) both are white |

## What is the maximum concentration of tce which can tolerateGiven the EPA acceptable risk level of 1 cancer in a million, what is the maximum concentration of TCE you can tolerate at the dry cleaning facility and keep your incremental cancer risk below the acceptable risk |

## Determine the settlements having stressThe soil properties of the clay are Cc = 0.25, Cr = 0.05, gsat = 18 kN/m 3 , for the sand gsat = 18 kN/m 3 , and the water table is 2 m below the soil surface. Determine the settlements when a stress of 100 kPa is applied by the building over an a.. |

## Determine total moment of the resultant hydrostatic thrustA steel tank with 2.5 m high vertical walls and a flat triangular floor is filled with three immiscible liquids layered upon each other. Two of the walls are 1.2 m long and perpendicular to each other. |

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