It is known that 5000 automobile trips are generated in a large residential area from 12:00 PM to 1:00 PM on Saturdays for shopping purposes. Four major shopping centres have the following characteristics: Shopping Centre 1 2 3 4 Distance from residential area (km) 4 9 8 14 Commercial floor space (thousands of m²) 20 15 30 60 Using a Logit model (with logit parameter equal to 1), the following utility function is estimated for the residents' choice of shopping destination: U = -0.283 X1 + 0.172 X2 where X1 is distance from residential area (km) X2 is commercial floor space (thousands of m²) Determine the number of shopping trips to each of the four shopping centres. Are the signs of the parameter coefficients reasonable? Discuss.

TITLE: DESIGN OF SINGLY REINFORCED RECTANGULAR BEAMS USING STRENGTH DESIGN METHOD. PROBLEM: Design a rectangular concrete beam section for positive moment and negative moment for the loads (unfactored) and p values given. Show sketch of cross section, including bar size, arrangement and spacing. Use concrete weight = 236 kN/m³, fy = 414 MPa, f`c = 27.6 MPa, p = 0.5Pmax concrete cover = 40 mm, tie bar = 10 mm Ø.Deadload : w₁₁ = 90 kN/m Live Load: WLL = 40 kN/m and PLL = 3kN. Assume beam weight equal to 8 kN/m. PLL W = WDL + WLL +Selfweight of beam 3.5m 7 m 3.5m Use p =Pmax (SUPPORT ONLY) COMPUTATION: Required: 1. Factored Load 2. Required moment Mu, using NSCP 2015 load combination. a. at the left support b. at the mid-span c. at the right support 3. Design a singly reinforced rectangular beam: a. at the left support b. at the mid-span c. at the right support Use b=0.54d and 32-mm diameter bar. 4. Check adequacy: a. at the left support b. at the mid-span c. at the right support SKETCH

For the truss and loading shown  given that thedistances AD=DG=12, BE=EH=12, and GH=12, determine the forcesof each member

س 1 تم أخذ قرار استثماري من قبل احدى الشركات المتخصصة في مجال البيئة والطاقة بالدخول في مشروع انشاء ابنية مستدامة وثبتت الشركة رغبتها بالحصول على عائد سنوي ثابت مقداره 50,000 دولار لمدة ثمانية سنوات بالاضافة الى عائد يغطي سداد ايجار مقر الشركة مقداره 35,000 دولار كل اربع سنوات, فاذا كانت المصاريف التشغيلية السنوية 20,000 دولار و نسبة الفائدة 10% % ماهو المبلغ الواجب استثماره من قبل الشركة لغرض تحقيق هذه العوائد؟ س2/ احسب القيمة المستقبلية المكافئة ( Future worth value ) للمشروع الاستثماري المبينة بياناته الاقتصادية في ادناه رأس المال Investment Cost الفقرة تكاليف التشغيل السنوية Annual Operating Cost العوائد السنوية Annual Revenue عمر المشروع Useful life Interest rate نسبة الفائدة Inflation rate نسبة التضخم المبلغ ($) 800,000 30,000 150,000 10 years 12% 4%

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A lagoon with volume 1,300 m3 has been receiving a steady flow of a non-conservative waste (rate constant= 0.19/day) at a rate of 80 m3/day for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of 12 mg/L.  A. What would be the concentration of pollutant in the effluent leaving the lagoon?  B. If the input waste concentration suddenly increased to 110 mg/L, what would the concentration in the effluent be 8 days later?

I dont know how to solve

The BOD of a river just below a sewage outfall is 40 mg/L. At this point, the DO is at the saturated value of 9.8 mg/L. The deoxygenation rate coefficient is 0.22/day, and the reaeration rate coefficient is 0.9/day. The river is flowing at 10 miles/day. There are no other sources of BOD in the river. A. Find the critical distance downstream at which DO is at a minimum. B. Find the minimum DO.

A lagoon with volume 1,300 m3 has been receiving a steady flow of a non-conservative waste (rate constant= 0.19/day) at a rate of 80 m3/day for a long enough time to assume that steady-state conditions apply. The waste entering the lagoon has a concentration of 12 mg/L.  A. What would be the concentration of pollutant in the effluent leaving the lagoon?  B. If the input waste concentration suddenly increased to 110 mg/L, what would the concentration in the effluent be 8 days later?