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- The nutural frequancy for the system is equal to k rigid uniform bar of mass (m) P b L 1 3kb2+PL 1 3kb2 mL? 2n The answer is O The Answer is 3kb²–3PL 2n V None of All mL? The Answer is O the answer is 3kb2+3PL mL? 1 the Answer isIf a sample of tap water contains 400 ppm of Ca2+ and 80 ppm of Mg2+, what is the hardness of this water sample in terms of equivalent concentration CaCO3, in mg/L? a.80 ppm CaCO3 b. 400 ppm CaCO3 c. NoneBOD is 196 mg/I
- 8. A 100 mL water sample contains 60 mg/L calcium and 15 mg/L magnesium. What is the total hardness of this water sample (expressed as mg/L as CaCO3) ? Atomic weights: Ca: 40 Mg: 24 C: 12 O: 16An Analysis of water from a surface stream yields the following results Ca+2=60mg/L HCO3-=115mg/L Mg+2=10mg/L SO4-2=96mg/L Na+=7mg/L NO3-=10mg/L K+=20mg/L CI-=11 mg/L If an error of 10 percent is acceptable, should the analysis be considered complete?Given the equations below, calculate the ultimate BOD (L) if the time, t (days) vs BOD, y (mg/L) results for a 5-day test are: t-1, BOD=8; t=3, BOD=13: t=5, BOD=18. )-()) 1/3 k, 213 (k; L)3 6 L13 k = 6 (m/b)L 6 mb
- 6-39 The following data were collected from a 10.16 mm-diameter test specimen of polyvinyl chloride (lo = 50.8 mm): Load (kN) Al (mm) 0.00000 1.334 0.1895 2.668 0.38 4.003 0.603 5.34 0.813 6.67 1.168 7.38 1.778 (maximum load) 7.12 2.388 6.316 3.048 (fracture) After fracture, the total length was 53.086 mm and the diameter was 9.982 mm. Plot the engineering stress strain curve and calculate (a) the 0.2% offset yield strength; (b) the tensile strength; (c) the modulus of elasticity; (d) the % elongation; (e) the % reduction in area; (f) the engineering stress at fracture; and (g) the modulus of resilience.The nutural frequancy for the system is equal to Ek rigid uniform bar of mass (m) P b 1 3kb²+PL 2n mL² the Answer is 1 3kb2 –3PL mL²Calculate DOI and identify the following structure as determinate, indeterminate, or unstable. Your answer is DOI if determinate or indeterminate and "-1" if unstable (the answer for any unstable structure is "-1" irrespective of the value of DOI). ז???? Type your answer..
- Q.1(a) What is water sweetening and softening? Discuss the lime-soda process of water softening with special reference to the different functions of lime and soda. (b) A water sample contains the following impurities per litre. Ca(HCO3)2–81 mg Mg(HCO3)2–73 mg CaSO4–68 mg MgSO4–60 mg KCl–100 mg Calculate (i) temporary and permanent hardness in water. Quantity of lime and soda required in kg for softening 50,000 litres of water if the purity of lime and soda are 80% and 90% respectively. (c) What are renewable sources of energy? Discuss their superiority over conventional sources of energy. How solar energy can be trapped thermally?Q. 4. 1 ppm CaC03 equivalent hardness is meant byA : 10 mg CaC03 equiv. Per litreB : 100 mg CaC03 equiv. Per litreC : 1 mg CaC03 equiv. Per litreD : 103 mg CaC03 equiv. Per litreA water sample contains 40 mg/L of magnesium, 75 mg/L of calcium, and 10 mg/L of sodium. What is the total hardness in (a) meq/L and (b) mg/L CaCO3?