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3 Perplexing Physics Problems
آمار یادگیری
سطح CEFR
سختی
زیرنویسها (308 بخشها)
everyone knows if you shake up a
carbonated drink it explodes but why is
this well here I have an identical
bottle with a pressure gauge fitted to
it and I want you to make a prediction
right here if I shake up this bottle
will the pressure increase decrease or
remain the same and while you're
thinking about that let me tell you this
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at the end of the show okay
I hope you've made your prediction and
registered it in the poll up here this
bottle has been sitting stationary for a
few days at room temperature you can see
the pressure reading is about three
atmospheres 330 kiloPascals and I'm
going to shake it up and see what
happens ready in three two one and the
pressure is still the same you might
suspect that well maybe this bottle is
all out of gas maybe it wouldn't explode
on me so just to make sure yep it would
go so it's not an increase in pressure
that causes a bottle to explode like
that
so why is it we shouldn't feel bad if
you predicted that the pressure would
increase because in fact that
explanation was published in New
Scientist in 1986 leaving many other
scientists to come forward saying that
is not the real explanation so we will
find out what it is
after we explore the second perplexing
physics problem consider this if you put
identical ice cubes in a cup of fresh
water and a cup of saltwater which ice
cube will melt first again you can
register your prediction by answering
the poll here now as you're thinking
about that I want to show you the setup
okay so here I have regular fresh water
I'm just gonna fill up each cup then I'm
gonna add about a tablespoon of salt
into this cup on the right if you know a
bit about chemistry
you may recognize that adding sodium
chloride
water actually takes energy and so it
lowers the temperature of this solution
by a little bit so I've got a
thermometer just to check and I'm gonna
let this solution sit here for a while
so that it comes back up to room
temperature okay have you made your
prediction let's put these ice cubes in
in three two one
and they're off watching Ice Cube's melt
isn't this entertaining YouTube it has
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