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Started By
Message
Monday brain teaser
Posted on 1/16/17 at 9:12 am
Posted on 1/16/17 at 9:12 am
Imagine a solid cube of steel measuring 1ft on each side and held by a cable.
The block of steel in the air weighs 490lb
Immersed in gasoline the weight drops to 443lb
Immersed in water the weight drops to 428lb
How much would the block weight if immersed in mercury?
The block of steel in the air weighs 490lb
Immersed in gasoline the weight drops to 443lb
Immersed in water the weight drops to 428lb
How much would the block weight if immersed in mercury?
18
Posted on 1/16/17 at 9:13 am to HogBalls
Bout tree fiddy
Posted on 1/16/17 at 9:14 am to HogBalls
Less than Bret Bielema? 
Posted on 1/16/17 at 9:14 am to HogBalls
It would float
Posted on 1/16/17 at 9:15 am to HogBalls
Wouldnt the block weight in mercury still be 490lb because we base weight in air in atmospheres? (which holds mercury)
Posted on 1/16/17 at 9:15 am to ksayetiger
quote:
It would float
Posted on 1/16/17 at 9:17 am to HogBalls
Your teaser is not properly formulated.
Posted on 1/16/17 at 9:17 am to HogBalls
quote:
How much would the block weight if immersed in mercury?
Trick question. OSHA would never allow it.
Posted on 1/16/17 at 9:19 am to HogBalls
some negative pounds.
It will float!
We need to know the density of steel and the density of mercury to figure this out.
It will float!
We need to know the density of steel and the density of mercury to figure this out.
This post was edited on 1/16/17 at 9:34 am
Posted on 1/16/17 at 9:20 am to ksayetiger
quote:
It would float
Hg is 847 lb/ft^3 FWIW.
Posted on 1/16/17 at 9:20 am to HogBalls
the cube weighs would it weighs. That isn't changing.
The force required to "hold it up" by the cable is changing b/c the buoyant force being applied to it is counter acting the gravitational force, which is directly related to it's weight, which isn't changing.
The force required to "hold it up" by the cable is changing b/c the buoyant force being applied to it is counter acting the gravitational force, which is directly related to it's weight, which isn't changing.
Posted on 1/16/17 at 9:20 am to Pectus
quote:
We need to know the density of steel
In the OP.
Posted on 1/16/17 at 9:21 am to HogBalls
Steel = 7.75 g/cm^3
Mercury = see GumboPots number
Mercury = see GumboPots number
This post was edited on 1/16/17 at 9:32 am
Posted on 1/16/17 at 9:22 am to TeddyPadillac
quote:
the cube weighs would it weighs. That isn't changing.
The force required to "hold it up" by the cable is changing b/c the buoyant force being applied to it is counter acting the gravitational force, which is directly related to it's weight, which isn't changing.
Posted on 1/16/17 at 9:23 am to Pectus
quote:
Steel = 7.75 g/cm^3
Mercury = 5.4 g/cm^3
Hg is 13.56 g/cm^3.
Posted on 1/16/17 at 9:24 am to Putty
lol this is why I didnt become a Mechanical Engineer. Too many frickin IF's
I'll stick to my 0's and 1's
I'll stick to my 0's and 1's
This post was edited on 1/16/17 at 9:25 am
Posted on 1/16/17 at 9:25 am to GumboPot
Ueah, without looking anything up I know Hg is denser than any steel
Posted on 1/16/17 at 9:29 am to Pectus
(no message)
This post was edited on 1/16/17 at 9:31 am
Posted on 1/16/17 at 9:31 am to HogBalls
The horses' name is Friday
Posted on 1/16/17 at 9:31 am to GumboPot
Youre right. my bad.
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