Unraveling Everyday Mysteries: Water Whirling and Tomato Juice Rings

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Water whirls when flushed due to the Coriolis effect and the shape of the toilet bowl, which creates a vortex as the water exits. This phenomenon is influenced by gravity and the design of the plumbing system. The rings on a glass after drinking tomato juice occur because of surface tension and the way liquid clings to the glass, creating uneven patterns as the liquid drains. These rings form due to the interaction between the liquid and the glass surface, leading to a non-uniform distribution of the juice. Understanding these everyday phenomena reveals the complex physics at play in simple actions.
Joonasja
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Hi everyone!
I have two rather simple and everyday phenomenons that I can't explain.
1) Why does water whirl when you flush it down, why doesn't it go in a straight line?
2) When you're drinking tomato juice, then why are there rings on the glass (after every zip there remains some juice on the glass, but why isn't it "even" in every place but forms rings.)?
 
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Please show your attempt at these questions as per the guidelines.

Jared
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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