Archimedes
What did the ~royal~ Archimedes drop in the bathtub to get him thinking about the buoyant force on sinking objects?
His crown
True or False: Archimedes principle applies to partially submerged objects only
False - it also applies to objects that sink! ◡̈
What kind of fluid flow is very irregular with changes in velocity of the fluid causing eddies in the fluid?
Turbulent flow
What children's book explains the drinking water treatment process accurately overall without too much high level science.
The Magic School Bus: At the Waterworks
Where does wastewater come from?
What direction is buoyant force?
What is the buoyant force for submerged objects written mathematically?
FB = Fg (displaced water) = mf x g
What kind of fluid flow is very smooth?
Laminar flow
What process appears in step 2 and 4 of the drinking water treatment process?
Sedimentation
Where does wastewater go after it's treated?
Back into natural bodies of water, i.e. rivers and waterways
What is the formula for density
Density = mass / volume (rho = m/V)
What is the buoyant force for floating objects written mathematically?
FB = Fg (object) = mo x g
What principle states that the pressure in a fluid decreases as the fluids velocity increases?
Bernoulli's Principle
What teeth enhancing chemical is added to NYC drinking water right before it gets distributed to the public?
Fluoride
Name at least 2 items that are commonly sent down the drain but make the treatment system more difficult?
Medications, plastics, non-flushable wipes, feminine products, etc.
Which step of drinking water treatment involves Archimedes Principle and flocs?
Step 3 - Coagulant dosing
What is the variable used for density?
The Greek letter rho (like a p with a fancy tail)
What is the formula for Pascal's Law?
P = F / A (Pressure = force over area)
What 2 chemicals are added during coagulant dosing to pull dissolved particles into solid flocs?
Alum / Aluminum sulfate (Al2(SO4)3) & Ferric chloride (FeCl3)
What gas is abundant in human waste, but can be used as a renewable energy source?
Methane
If the weight of an object is more than the weight of the water it displaces, what happens?
It sinks
If the weight of an object is less than the weight of the water it displaces, what happens?
It floats
What chemical is added to disinfect the drinking water before it gets distributed to the public? Hint: it is not safe to drink in high concentrations like pool water)
Chlorine
What is used in the third step of the wastewater treatment process to get rid of many contaminants in the wastewater?
Microorganisms