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re: Monday brain teaser
Posted on 1/16/17 at 9:31 am to HogBalls
Posted on 1/16/17 at 9:31 am to HogBalls
I'm assuming that by "weight" you're referring to the force of the pull on the cable.
According to Google, mercury has density = 13.56 g/cm3.
Steel (my google site didn't say which alloy but you didn't either) has density = 8050 kg/m3. Converting units, I get 8.05 g/cm3.
Since 8.05 < 13.56, mercury is more dense and the steel will float. Since there is no force on the cable, the steel weighs nothing.
ETA: The weight of the OSHA paperwork would be more than a frickton.
According to Google, mercury has density = 13.56 g/cm3.
Steel (my google site didn't say which alloy but you didn't either) has density = 8050 kg/m3. Converting units, I get 8.05 g/cm3.
Since 8.05 < 13.56, mercury is more dense and the steel will float. Since there is no force on the cable, the steel weighs nothing.
ETA: The weight of the OSHA paperwork would be more than a frickton.
This post was edited on 1/16/17 at 9:37 am
0
Posted on 1/16/17 at 9:32 am to HogBalls
what is the current price of steel on the AMEX?
that is what really matters here
that is what really matters here
Posted on 1/16/17 at 9:33 am to TeddyPadillac
quote:
the cube weighs would it weighs. That isn't changing.
The total weight of the cube + whatever it is in doesn't change. But if you measure weight as the amount of force on the cable, indeed it does change. This is demonstrated in the OP's statement of how it changes when immersed in water or gasoline.
Posted on 1/16/17 at 9:34 am to WinnPtiger
quote:
what is the current price of steel on the AMEX?
Steel is a commodity and doesn't trade on a stock exchange.
Posted on 1/16/17 at 9:41 am to foshizzle
quote:
Steel is a commodity and doesn't trade on a stock exchange.
that's the joke
Posted on 1/16/17 at 9:41 am to HogBalls
184.81
Posted on 1/16/17 at 9:43 am to HogBalls
288
Posted on 1/16/17 at 9:43 am to HogBalls
You don't bury survivors.
Posted on 1/16/17 at 9:49 am to ksayetiger
ksayetiger
Winner winner
A cubic foot of mercury weighs a little over 490lbs. The block of steel would float
Winner winner
A cubic foot of mercury weighs a little over 490lbs. The block of steel would float
Posted on 1/16/17 at 10:00 am to HogBalls
The doctor is the cube of steel's mother.
Posted on 1/16/17 at 10:03 am to foshizzle
quote:
But if you measure weight as the amount of force on the cable
Weight is measured in Newtons, not pounds.
LBs refers to a mass.
Weight is equal to mass*gravity
It's weight, when commonly mistake as measured as a mass, or as a force, isn't changing. It's mass doesn't change, and neither is gravity.
the only thing changing in his scenario is the amount of force being counteracted to gravity, which affects the amount of force required to lift the cube, but it isn't changing it's mass, or weight.
Posted on 1/16/17 at 10:10 am to HogBalls
This has application in my daily life exactly how...? 
Posted on 1/16/17 at 10:21 am to HogBalls
Oh, and here's another:
Guy who's 40 marries a gal whose 1/2 his age.
When the guy turns 60, the gal is 2/3 his age.
When he turns 80, she's 3/4 his age.
How old will the guy be when the gal catches up to his age?
Guy who's 40 marries a gal whose 1/2 his age.
When the guy turns 60, the gal is 2/3 his age.
When he turns 80, she's 3/4 his age.
How old will the guy be when the gal catches up to his age?
Posted on 1/16/17 at 12:07 pm to TeddyPadillac
quote:
It's weight, when commonly mistake as measured as a mass, or as a force, isn't changing.
It does in the examples he cited, so I inferred he used the colloquial meaning of "weight" as a force rather than the technical correct one as a mass. I'm well aware of the difference, and that's why I qualified my answer to his question without insisting on being a pendant.
BTW, although force is measured in Newtons in the metric system, the imperial system has both "pound-force" and "pound-mass".
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