It is recommended that drinking water contain 1.6 ppm fluoride (f−) for prevention of tooth decay. consider a reservoir with a diameter of 4.70 ✕ 102 m and a depth of 14.2 m. (the volume is πr2h, where r is the radius and h is the height.) how many grams of f− should be added to give 1.6 ppm?

Abeverage can is made of 3004-h19 aluminum alloy (elastic modulus 69 gpa, tensile yield strength 285 mpa, density 2.72 g/cm^3). the dimensions on the can are approximated as a thin-walled cylinder with a height of 4.83 inches, diameter of 2.60 inches. empty the can has a mass of 14.2 g. determine: a. the wall thickness of the cylinder b. assuming a pinned-pinned condition what is the critical load? c. assuming a fixed-fixed condition what is the critical load?