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wajeeha
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Join Date: Jul 2010
Posts: 11

Newton's Law of Cooling

02/01/2011 11:45 PM

salam to dears;

i have problem in solving question plz help me;question is "at 1 pm, a thermometer reading 70 F is taken outside where the air temperature is -10F (ten below zero). at 1:02 p.m., the reading is 26F. At 1:05 p., the thermometer is taken back indoors , where the air is at 70 F. What is the temperature reading at 1:09 pm?" the expected answer is 56F.

Regards

wajeeha kiran
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mjb1962853
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Engineering Fields - Electrical Engineering - Analog and Digital Circuit Design Engineering Fields - Electromechanical Engineering - Transformers, Motors & Drives, EM Launchers Engineering Fields - Engineering Physics - Applied Electrical, Optical, and Mechanical

Join Date: Jan 2008
Location: NY
Posts: 1207
Good Answers: 119
#1

Re: newton's law of cooling

02/02/2011 6:16 AM

The problem involves a differential equation with an exponential solution.

http://en.wikipedia.org/wiki/Time_constant#Thermal_time_constant

With this information you can verify the correct answer.
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Anonymous Poster
#2

Re: Newton's Law of Cooling

02/03/2011 6:15 PM

Sweetheart

Newtons law of Cooling is also known as the Seventhlaw of thermodynamics.

Answer is:If the thermometer was made in China and the sun is out, The reading wil be -11F (eleven below zero) if the day has more than twelve(12) hours of sunlight. The hoped for response is 3.141592653 Kelvin....if it is Tuesday.

Hope that you are enjoying your first pair of shoes.

Wahdeed
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