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Friday, November 26, 2010
Ch 13_3 #3
Use equation for the rate of conduction of heat across a temperature differenceand use for the temperature of the burner
13 comments:
Anonymous
said...
Sorry, what do we use as the temperature of the burner?
A copper-bottomed kettle, its bottom 24cm in diameter and 3.0 mm thick, sits on a burner. The kettle holds boiling water, and energy flows into the water from the kettle bottom at 800W.
5:52 PM Anon, thank you SO much. I was sitting here banging my head against what in the world I was doing wrong because I did all the calculations right!
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13 comments:
Sorry, what do we use as the temperature of the burner?
That is what you need to find out
Oh right...sorry about that.
do we need the thermal conductivity for copper?
Yes
A copper-bottomed kettle, its bottom 24cm in diameter and 3.0 mm thick, sits on a burner. The kettle holds boiling water, and energy flows into the water from the kettle bottom at 800W.
Q/t=KA (T/L)
800W=(400W/mK)(pi .12m^2)(x/.003m)
800W=(400W/mK)(.045m^2)(x/.003m)
800=18(x/.003)
44=x/.003
x=.13 ?
Im stumped
add that to the boiling temp of water- 100 degrees
OH MY GOD THANK YOU SO MUCH =)
To the above commentor:
I'm confused why you have to add it to 100 instead of subtracting it from 100. Enlighten me, please!
In his equation, T = Tf - Ti = .13 So Tf = T + Ti. .13 + 100. Ti = 100 because you start with boiling water in the kettle.
5:52 PM Anon, thank you SO much. I was sitting here banging my head against what in the world I was doing wrong because I did all the calculations right!
I second that!
How Mr Benjamin Lee service granted me a loan!!!
Hello everyone, I'm Lea Paige Matteo from Zurich Switzerland and want to use this medium to express gratitude to Mr Benjamin service for fulfilling his promise by granting me a loan, I was stuck in a financial situation and needed to refinance and pay my bills as well as start up a Business. I tried seeking for loans from various loan firms both private and corporate organizations but never succeeded and most banks declined my credit request. But as God would have it, I was introduced by a friend named Lisa Rice to this funding service and undergone the due process of obtaining a loan from the company, to my greatest surprise within 5 working days just like my friend Lisa, I was also granted a loan of $216,000.00 So my advice to everyone who desires a loan, "if you must contact any firm with reference to securing a loan online with low interest rate of 1.9% rate and better repayment plans/schedule, please contact this funding service. Besides, he doesn't know that I am doing this but due to the joy in me, I'm so happy and wish to let people know more about this great company who truly gives out loans, it is my prayer that GOD should bless them more as they put smiles on peoples faces. You can contact them via email on { 247officedept@gmail.com} or Text through Whatsapp +1-989 394 3740.
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