Example: A product developer is interested in reducing the drying time of a primer paint. Two formulations of the paint are tested; formulation 1 is the standard chemistry, and formulation 2 has a new drying ingredient that should reduce the drying time. From experience, it is known that the standard deviation of drying time is 8 minutes, and this inherent variability should be unaffected by the addition of the new ingredient. Ten specimens are painted with formulation 1, and another 10 specimens are painted with formulation 2; the 20 specimens are painted in random order. The two sample average drying times are 121 minutes and 112 minutes, respectively. What conclusions can the product developer draw about the effectiveness of the new ingredient, using a-0.05?

Example: A product developer is interested in reducing the drying time of a primer paint. Two formulations of the paint are tested; formulation 1 is the standard chemistry, and formulation 2 has a new drying ingredient that should reduce the drying time. From experience, it is known that the standard deviation of drying time is 8 minutes, and this inherent variability should be unaffected by the addition of the new ingredient. Ten specimens are painted with formulation 1, and another 10 specimens are painted with formulation 2; the 20 specimens are painted in random order. The two sample average drying times are 121 minutes and 112 minutes, respectively. What conclusions can the product developer draw about the effectiveness of the new ingredient, using a-0.05?

Structural Analysis

6th Edition

ISBN:9781337630931

Author:KASSIMALI, Aslam.

Publisher:KASSIMALI, Aslam.

Chapter2: Loads On Structures

Section: Chapter Questions

Problem 1P

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You are asked to complete an investigation into the efficiency of removal of your toilet. The bowl hold 5 liters of water. When you flush almost all flows out, but some does remain. You inject dye into the bowl at a concentration of 1g/L. The dye that remains (with the water) then dilutes evenly into the water that fills up the bowl after the flush. The concentration after five flushes is 0.313 ug/L (micrograms per liter). How much water (volume) remains in the toilet after each flush?
A8
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2. Families in a community in a developing country use large, 200.0 L drums to un-treated surface water. You are designing a device that is designed to dose the volume with a coagulant, stir to allow flocculation, then add chlorine tablets to disinfect the water. The water is 25 °C and initially contains 1.0E+09 particles per L. The initial particles can be assumed to be spherical, 15.0 micrometers in diameter, and with a density of 1.675 g/mL. a. If the drums have a diameter of 572 mm, how long will it take for the particles to completely settle without any coagulation or flocculation? (answer in seconds) You have determined that you can achieve complete destabilization of particles by achieving an ionic strength of 0.01 M or higher. If you use alum (Al2(SO4)3) as a coagulating agent, what mass of alum must be added per batch of 200 L? (answer in grams) How many joules of energy would be required to stir the drum at a mixing intensity of 150 s-' for 20 minutes? If the drum is stirred…
While visiting Zagreb, Croatia, Mr. Arthur Van de Lay visits the Mimara Art Museum and then takes in the great architecture of the city. He stops at a café in the old town and orders a bottle of mineral water. The reported chemical concentration of this water is: [Na+] = 0.65 mg/L, [K+] = 0.4 mg/L, [Mg2+] = 19 mg/L, [Ca2+] = 35 mg/L, [CI-] = 0.8 mg/L, [SO42-] = 14.3 mg/L, [HCO3-] = 189 mg/L. (a) Which of these chemicals would you use to calculate hardness? (b) All aqueous solutions must maintain charge neutrality. Another way to state this is that the sum of all cations on an equivalent basis must equal the sum of all anions on an equivalent basis (within 5%). Thus, water samples can be checked to determine whether something is incorrect in the analyses or a constituent is missing. Verify that the reported chemical concentrations listed above make sense based on the above information.
1.Consider a tank used in certain hydrodynamic experiments. After one experiment the tank contains VLitersof a dye solution with a concentration of 1 g/L. To prepare for the next experiment, the tank is to be rinsed with fresh water flowing in at a rate of 2 L/min, the well-stirred solution flowing out at the same rate. Find the time that will elapse before the concentration of dye in the tank reaches 1% of its original value. Use V = 140 V=140x10=1400 liters
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