1.a completely mixed activated sludge plant is to treat 10,000 m^3\day.the wastwater has a BOD5 of 1200 mg\liter that must be reduced to 200 mg\liter.if the mean cell residence time 5 days and suspended solids concentration of 5000 mg\liter and Y 0.7 kg\kg and kd 0.03 \day determine sludge recycle ratio R?

2.A steel rod of 1/8 inch diameter is bent into a loop 10 feet in diameter. Determine the maximum flexural stress in the rod

3.Determine the allowable moment about the horizontal neutral axis that a timber beam with nominal size 50 X 100 can resist without exceeding the allowable stress of 10 MPa. The dressed size is 38.1 X 88.9 mm, I = 0.00000223m^4, and S = 0.0000502 m^3.

Please show all steps and work.

What statement best describes how a static system differs : The coordinates for the benchmark are 1421334.93,783207.62 the first point in the survey for oleson village, is 113.66 feet from the benchmark and at a bearing of n5d27'23"w. this is other survey point 542.16 So how dose this work? |

Describe how the following ratios and indices are used : A breif explination on clay mineralogy including isomorphous substitution, specific surface, cation exchange capacity and their effect on clay properties. |

Determine the maximum flexural stress due to two concentrate : If the performance of an entire system, due to the actions and interactions of its component subsystems, is measured as being greater than the sum of the performance of the individual subsystems' actions if they operated independently then we have ob.. |

Determine the shear stresses at each of the following points : A 6 inch X 4 inch rectangular beam is subjected to a maximum shear force of 1900 lbf. Determine the shear stresses at each of the following points on the beam cross section: |

Determine the allowable moment about the horizontal neutral : Determine the allowable moment about the horizontal neutral axis that a timber beam with nominal size 50 X 100 can resist without exceeding the allowable stress of 10 MPa. The dressed size is 38.1 X 88.9 mm, I = 0.00000223m^4, and S = 0.0000502 m^3. |

What is the maximum that each of these 2 equal loads can be : A 100 mm diameter log is subjected to two equal loads equally spaced along its 450 mm length at 150mm intervals. The beam has an allowable flexural stress of 9 MPa and a much lower allowable shear stress parallel to the grain of 850 kPa |

What other structural considerations are necessary in the : If the maximum allowable compressive stress of timber is 7MPa, what is the minimum available size of square section post required. (give dimensions as well as area). Please show working. |

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. |

## Calculate the deflection angle from the tangent at the pcThe P.C. of a 3 degree curve, whose degree is based on a chord of100 ft. arc, is at Sta. 19+39.60 and the P.T is at Sta. 25+64.60. Calculate the deflection angle from the tangent at the P.C |

## Determine the energy dissipated in the jumpA hydraulic jump forms in a horizontal trapezoidal channel. The base width is 4m and the side slopes are 45o. The depths upstream and downstream of the jump are 1m and 3m. |

## Use work and energy to find paul speedSusan's 12.0 baby brother Paul sits on a mat. Susan pulls the mat across the floor using a rope that is angled 30 degrees above the floor. The tension is a constant 31.0 and the coefficient of friction is 0.210. Use work and energy to find Paul's .. |

## Determine bulk density and the degree of saturationA cylindrical sample of soil 39 mm in diameter and 77 mm long weighed 180 g. The sample is not fully saturated and its moisture content was found to be 27.0%. Assume rS = 2.70 Mg/m3. Determine: a. the bulk density, r b. the dry density, rd c. the d.. |

## Determine the minimum size of the pad footing for a steelA 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.. |

## Determine the uniform flow depth in a trapezoidal channelDetermine the uniform flow depth in a trapezoidal channel with a bottom width of 8 ft and side slopes of 1 vertical to 2 horizontal. The discharge is 100 ft3/s. Manning roughness factor is 0.015 and the channel bottom slope is 0.004. |

## Difference between stiffness and flexibility matrixWhat is the difference between stiffness and flexibility matrix |

## Determine the number of truck loads required to obtainFor construction of an embankment, the soil is transported from a borrowed area using a truck which carries 5.5 m^3 of soil at a time, with the following details: For the Borrowed Pit: bulk unit weight= 16 KN/m^3 and moisture content = 6.7% |

## Determine what is the turbidity downstream from charlotteThe James River flows in from the East at 50 m^3/s and joins the Jackson River flowing at 500 ft^3/min just outside Charlotte, NC. The turbidity in the James River is 6.8 NTU. |

## Calculate the location of the effective depth on both sidesbeam is 24 inch deep, the steel stirrup used is number 4,a 1 1/2 inch. concrete cover on both sides. Sketch how you will place the bars and calculate the location of the effective depth. |

## Find the p-value to provide adequate compressive strengthA new concrete mix is being designed to provide adequate compressive strength for concrete blocks. The specification for a particular application calls for the blocks to have a mean compressive strength greater than 1350 kPa. |

## Determine what is the magnitude of the maximum stressWhat is the magnitude of the maximum stress that exists at the tip of an internal crack having a radius of curvature of 5.5× 10-4 mm (2.165 ×10-5 in.) and a crack length of 3.5 ×10-2 mm (1.378 × 10-3in.) |

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