Stuart designed and built a water filter in class. He wants to know if it will make water from lakes or streams safe to drink. Which of the following would it be best for Stuart to measure in an experiment in order to test his design and answer this question? A. the amount of time required for different volumes of water to pass through his filter B. the diameter of the largest grain of dust, dirt, or sand that can pass through his filter C. the amount of bacteria and impurities in water both before and after it passes through his filter D. the maximum force that can be applied to his filter without breaking it
Question
Stuart designed and built a water filter in class. He wants to know if it will make water from lakes or streams safe to drink. Which of the following would it be best for Stuart to measure in an experiment in order to test his design and answer this question? A. the amount of time required for different volumes of water to pass through his filter B. the diameter of the largest grain of dust, dirt, or sand that can pass through his filter C. the amount of bacteria and impurities in water both before and after it passes through his filter D. the maximum force that can be applied to his filter without breaking it
Solution 1
The best way for Stuart to test his water filter would be option C. He should measure the amount of bacteria and impurities in the water both before and after it passes through his filter. This is because the main purpose of a water filter is to remove bacteria and impurities from the water, making it safe to drink. By comparing the amount of bacteria and impurities in the water before and after it passes through the filter, Stuart can determine how effective his filter is at cleaning the water.
Solution 2
No answer
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When measuring water flow the equation is Q=AV, with Q meaning water flow, A meaning area, and V meaning velocity. On the exam, you will be given enough information to calculate the river's area and the river's average velocity. Water Flow ExampleThe river has been measured and you are given the following dimensions and velocity readings. Calculate the overall water flow. Average depth is (1.5 + 2.4 + 5.1 + 4.7 +1.2)/5 = 15/5= 3ftCross-sectional area is 3ft X 32ft = 96 ft2Average Velocity is (12.1+10.2+7.5+8.2+11.4)/5 = 9.88 ft/m Q=AVQ= 96 ft2 X 9.88 ft/mWater Flow = 948.48 ft3 /min
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