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?

Mutt and jeff are running along a path each pushing a cart loaded with rocks. if mutt's wagon has a mass two times greater than jeff's and they want to stay together, arriving at their destination at the same time, what must happen? a) jeff should slow down so mutt can catch up. b) mutt must use half as much force to push his cart. c) mutt must use twice as much force to push his cart. d) mutt and jeff will use the same force, but mutt will take bigger steps.

The pressure proportional to the area a- inversely b- directly c- increase d-decrease

Immediately upon reaching its lowest point, a falling pendulum bob has its greatest amount of energy, which is the initial amount of potential energy. a. heat; less than b. heat; more than c. kinetic; less than d. kinetic; more than