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. For 80 cm3/min steady-state flow rate, a total head difference of 8 cm was measured across two points separated by 10 cm along the axis of the sample. The dry mass of the sample (i.e. the mass of solids) is 1548 g and the specific gravity of silica sand is 2.65. Calculate:

a. the hydraulic conductivity (k) of silica sand,

b. the unit flux (q) through the sample, and

c. the seepage velocity (v) through the sample.

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.. |

Determine the maximum tensile and compression stresses in : A 6ft wide, 10ft high vertical rectangular gate has its top edge 6ft below the water level. it is hinged along its lower edge. what force, acting on the top edge, is necessary to hold the gate shut? |

When the local mean time at los angeles : The longitude of Albany, New York, is +73 degrees 44' 49" and the longitude of Los Angeles, California, is +118 degrees 10' 44". When the local mean time at Los Angeles is 10h 41m 00s a.m., the local mean time at Albany is |

Calculate the height of water in the standpipe after 4 hours : A falling-head permeability test is being conducted on a saturated sample of clayey silt having hydraulic conductivity of 6.5 x 10-9 m/s. The diameter and the length of the sample are 100 mm and 150 mm |

## Determine the approximate drag coefficient for the parachuteA 5-m-diameter parachute of a new design is to be used to transporta load from flight altitude to the ground with an average verticalspeed of 3 m/s. The total weight of the load and theparachute is 200 N. Determine the approximate dragcoefficient for.. |

## Determine what speed will sleeve attain if force is appliedA Newtonian fluid is in the clearance between a shaft and a concentric sleeve. When a force of 600 N is applied to the sleeve parallel to the shaft, the sleeve attains a speed of 1 m/s. If a 1500 N force is applied, what speed will the sleeve atta.. |

## Calculating sand shear strengthEstimate the effective friction angle for the sand (assume c' = 0). Calculate the sand's shear strength (τf) on a horizontal plane at depths of the 20 ft and 50 ft. |

## Expanded depth of the bed after the backwashFind the expanded depth of the bed after the backwash when initial depth of the bed is 3 ft using given conditions. μ = 0.01g/cm/sec, T = 25oC, ρs = 2.65, ρ=1, washrate = 1.5 cm/sec, ks2 = 196. (Assumed single size) |

## What is the terminal velocity of the ping pong ball in waterA ping-pong ball (diameter = 40mm, weight= .03 N Volume =4piR^3/3) is released from the bottom of a swimming pool. What is the terminal velocity of the ping pong ball in the water |

## Briefly explain reason for variation of water coefficientA homogeneous coarse sand deposit has a water table at 10 m depth. The water coefficient of permeability of the sand is found to vary significantly with height above the water table even though the sand deposit is homogeneous. |

## What is expected ground level concentration 2 km downwindThe SO2 emission from a fixed source is 25 g/s. The effective stack height is 60 m, the wind speed is 4 m/s at the top of the stack. Assuming class C stability, what is the expected ground level concentration 2 km downwind |

## Determine if the as-drawn wire will break during the processA 3105 Aluminum alloy wire is to be drawn to give a 1-mm diameter wire having a yield strength of 20,000 PSI. assume that there is no friction in the wire drawing process |

## Determine magnitude of p if 10sec is required for packageDetermine the magnitude of P if 10sec is required for the package to travel 5 m up the incline. The static and kinetic coefficients of friction between the package and the incline are both equal to 0.3 |

## How to estimate the discharge rate of the pipelineReservoir A (water surface elevation = 1300 ft) is connected to reservoir B (water surface elevation=250 ft) by 6,000 ft of 14 inch diameter cast iron pipe (e = 0.005 ft. Neglecting all minor losses |

## Explain how to estimate the power output of the arrangementA hydroelectric facility operates with an elevation difference of 50.0 m with a flow rate of 500 m3/sec. If the rotational speed is 90 rpm, determine the most suitable type of turbine and estimate the power output of the arrangement. |

## Determine the distance between the stations brought to restA train starts from rest at station A and accelerates at 0.5m/s^2 for 60s. Afterwards it travels with a constant velocity for 25min. It then decelerates at 1 m/s^2 until it is brought to rest at station B. |

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