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Author Science Question Of The Day
MikeLamb
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9th Feb 06 at 21:56   View User's Profile U2U Member Reply With Quote
How much energy does a glass of water have?

Assume the glass has a radius of 3cm, and is filled 15cm high.

A marshmellow to the person with the right answer.
Robin
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9th Feb 06 at 22:00   View Garage View User's Profile U2U Member Reply With Quote
i read this as

"assume the glass has a radius of 3corsameal, and is filled 15cm high"

i shall find the answer....
vibrio
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9th Feb 06 at 22:00   View User's Profile U2U Member Reply With Quote
what kind of energy?
Rus
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9th Feb 06 at 22:00   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by vibrio
what kind of energy?
Carl
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9th Feb 06 at 22:01   View User's Profile U2U Member Reply With Quote
does it matter if its hot or cold? frozen or boiling?
Jodi_the_g
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9th Feb 06 at 22:02   View User's Profile U2U Member Reply With Quote
Need to know the temp as well, and and as vibs said what engery
vibrio
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9th Feb 06 at 22:03   View User's Profile U2U Member Reply With Quote
you can increase it's temp by stiring
MikeLamb
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9th Feb 06 at 22:04   View User's Profile U2U Member Reply With Quote
I assume room temp
Simon
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9th Feb 06 at 22:05   View User's Profile U2U Member Reply With Quote
whose room
Rus
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9th Feb 06 at 22:08   View User's Profile U2U Member Reply With Quote
mikelamb, you suggest you give everyone here a marshmellow and delete the thread
MikeLamb
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9th Feb 06 at 22:09   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by Rus
mikelamb, you suggest you give everyone here a marshmellow and delete the thread


???

assume theres no gravity near the glass
Rus
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9th Feb 06 at 22:10   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by MikeLamb
quote:
Originally posted by Rus
mikelamb, you suggest you give everyone here a marshmellow and delete the thread


???

assume theres no gravity near the glass


the water would flot out of the glass
vibrio
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9th Feb 06 at 22:12   View User's Profile U2U Member Reply With Quote
28.724 kJ of latent energy assuming pure liquire water assuming a temperture of 0 degrees
MikeLamb
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9th Feb 06 at 22:15   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by vibrio
28.724 kJ of latent energy assuming pure liquire water assuming a temperture of 0 degrees


Knew you would answer! How do you work that out?

The person asking me is insisting temp isnt important??
MikeLamb
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9th Feb 06 at 22:19   View User's Profile U2U Member Reply With Quote
And if this power was employed in lifting say... a car... assuming constant gravity at 9.81, how high would it be lifted (assuming 100% efficiency) from the ground.
Robin
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9th Feb 06 at 22:20   View Garage View User's Profile U2U Member Reply With Quote
tell them to do their physics coursework themselves Mike
vibrio
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9th Feb 06 at 22:21   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by MikeLamb
quote:
Originally posted by vibrio
28.724 kJ of latent energy assuming pure liquire water assuming a temperture of 0 degrees


Knew you would answer! How do you work that out?

The person asking me is insisting temp isnt important??


not got a clue. I did thermodynamics 13 years ago FFS

MikeLamb
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9th Feb 06 at 22:22   View User's Profile U2U Member Reply With Quote
haha
vibrio
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9th Feb 06 at 22:22   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by MikeLamb
And if this power was employed in lifting say... a car... assuming constant gravity at 9.81, how high would it be lifted (assuming 100% efficiency) from the ground.


how heavy is the car?
vibrio
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9th Feb 06 at 22:28   View User's Profile U2U Member Reply With Quote
assuming a car weights 1000kg then the energy latent energy stored in that glass would raise the car by 2.856m
Robin
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9th Feb 06 at 22:30   View Garage View User's Profile U2U Member Reply With Quote
what if ti was jrs car? (781kg) or mine (860kg)
MikeLamb
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9th Feb 06 at 22:32   View User's Profile U2U Member Reply With Quote
how did you work it out?
vibrio
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9th Feb 06 at 22:32   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by robmarriott
what if ti was jrs car? (781kg) or mine (860kg)



Jr's 3.6568
yours 3.3093
MikeLamb
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9th Feb 06 at 22:32   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by robmarriott
what if ti was jrs car? (781kg) or mine (860kg)



vibrio
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9th Feb 06 at 22:35   View User's Profile U2U Member Reply With Quote
quote:
Originally posted by MikeLamb
how did you work it out?



energy is released when water turns to ice this is called latent heat. the amount of latent heat is dependant on the volume of water. 1j is the amount of energy required to lift 1kg 102mm and so on. I think I'm right. I'm a molecular biologist doing physicis FFS

 
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