3 Perplexing Physics Problems

Why does shaken soda explode? Does ice melt first in fresh or salt water?

This video features experiments that have been shown to me by science teachers over the years. Does ice melt fast in salt water or fresh water was an experiment introduced to me at the Utah Science Teachers' conference. The ring of metal over a chain demo came from a teachers event in Florida. The idea shaking a carbonated drink increases pressure came from an email.

Special thanks to Petr Lebedev for building the pressure gauge.

Links to literature are below:
Victims of the pop bottle, by Ted Willhoft. New Scientist, 21 August 1986 p.28

Carbonation speculation

Agitation solution

Filmed by Cristian Carretero, Jordan Schnabel, Jonny Hyman, and Raquel Nuno

[polgabaldon]

Can we all take a moment to appreciate this fly flying through the ring in slo-mo? 5:26

[jarradscarborough]

Derek: works hard, makes smart science video
internet: *_oh, look, there's a fly!_*

[ourochroma]

5:20 I'm impressed by that fly's performance skills.

[FrostyRecluse]

The slow-mo audio of the ring falling down the chain has to be one of the most satisfying sounds I've heard

[MittelFischxD]

That fly on 5:25 was like "you want to challenge me, mortal?!"

[Traek]

Imagine writing a paper that can be disproven by attaching a pressure gage to the bottle

[ToastyFresh]

This man not only told us how bottles explode but how to prevent it

Give him a salute

[dominicdudebromtl]

I'm more impressed by the fly who flew through the ring while it fell than the actual ring trick itself lol

[Killbayne]

Imagine giving your friend a sip of soda and he just goes "ahhh, non-equilibrium beverage"

[edouarddubois]

The slowmo sound of the ring and chain was very satisfying.

[drdtmm]

"lets put these ice cubes in..."

proceeds to throw ice SPHERES into the water

[greatspacegoat]

I have a pretty big physics problem that has perplexed me my whole life.

The closest supermarket from where I live is 500 meters (roughly) and it takes me 12 minutes to walk there and back at a walking speed of 5 kph (3 mph). The problem is it has taken my father 18 years to make this trip and I want to know how this strange phenomenon has occurred.

[true_perplexeus]

He went back to his roots, challenging wide spread science myths

[MandMs]

5:26
Person: *drops ring*
Fly: "Are you challenging me?"

About the second problem: ice cube in fresh water and in salt water - why not use thermal camera (with time-lapse) to see what is happening?

[roopjindersingh]

The hardest part of the ring experiment would be catching the fly and getting it to fly through the ring to replicate the experiment exactly.

[iqbalumran]

The sound of the ring in slowmo is really satisfying

[kittykoya]

5:20 that fly went through the ring!! What an amazing performance!

[WuHo]

"Would you like to make it a combo?" "Yes, fries and non-equalibrium beverage please."

[inconnn]

My mom taught me with soda cans (not bottles) that if you want to prevent it from exploding after shaking it, you tap the top of the can. Never made sense why but now I finally get it