Register to reply 
Temperature of Iron. 
Share this thread: 
#1
Sep1604, 07:51 AM

P: 4

For most of you experts out there, this should be fairly simple to answer. Well, technically, all it takes is logic to answer this:
A block of Iron has a temperature of 10 degrees celsius. There is a second block of iron, identicle to the first, that is 2x the temperature of the first block of iron. What is the temperature of the second block of iron? 


#2
Sep1604, 08:06 AM

P: 1,116

The Bob (2004 ©) 


#3
Sep1604, 09:29 AM

Sci Advisor
HW Helper
P: 2,278

Using my Post 1491 analog calculator, I line up 10 degrees Celsius with the left index, move the cursor to 2 on the D scale, read 293 degrees Celsius on the Celsius scale. (select to see answer).



#4
Sep1604, 09:46 AM

Emeritus
Sci Advisor
PF Gold
P: 11,155

Temperature of Iron.
BobG, surely, I have no idea what you're talking about. Maybe that's because I really haven't much used calculators, least of all, the analog ones you're so fond of. Somehow, you seem to have lucked out and gotten the right answer.



#5
Sep1604, 09:48 AM

P: 406

If BobG's answer is correct (I think it is), then you really do need a knowledge of absolute temperatures and not just logic. Twice 283 K (10 degrees Celsius) x 2 = 566 K = 293 degrees Celsius. Highlight the empty space above to behold my answer. 


#6
Sep1604, 11:12 AM

Sci Advisor
PF Gold
P: 1,479

The question is incompleted. It depends of the dynamic state of the observer. If an observer is attached to a reference frame travelling a speed near light speed, then the measurements would be done by means of photoelectric instruments. The thermal energy will depend on the reference frame, and so the temperature. Sounds pretty well, isn't it? 


#7
Sep1604, 11:45 AM

P: 4

Technically, BobG is right. If you convert 10 degrees celsius into kalven, then double that number, and convert the doubled number back into celsius, you will get bob's answer. Good job :)



#8
Sep1604, 12:09 PM

P: 1,116

The Bob (2004 ©) 


#9
Sep1604, 12:27 PM

Emeritus
Sci Advisor
PF Gold
P: 11,155

The correct answer is 293C. The absolute scate for temperature is the Kelvin scale. So to double the temperature, you must double the Kelvin temperature.



#10
Sep1604, 12:44 PM

P: 1,116

The Bob (2004 ©) 


#11
Sep1604, 04:11 PM

P: 4

yuppo! that's right, and I'm prettty sure I said that BobG was right.



#12
Sep1604, 04:15 PM

P: 1,116

The Bob (2004 ©) 


#13
Sep1604, 04:53 PM

P: 297

How do we know that temperature is a linear scale? If it is a measure of the kinetic energy of the molecules that make up a substance, then that energy increases as the square of the average (for some meaning of average) molecular speed.
The Celcius scale is fixed at two points (0 and 100) by boiling and freezing pure water at a certain atmospheric pressure. but what shape is the line joining these points? Is it a straight line, or a parabola? In what sense is 50 degrees C 'half way' between 0C and 100C ? 


#14
Sep1604, 08:17 PM

P: 406




#15
Sep1704, 10:38 AM

Sci Advisor
HW Helper
P: 2,278

I saw it.
But, the use of my 1955 calculator, which you made fun of me for using, which has never had a new set of batteries installed in it, which is just now finally beginning to get that nice broken in feel to it, and which should last at least another 25 years, enabled me to get my answer in first. You gotta love good bamboo. 


#16
Sep1704, 11:06 AM

Emeritus
Sci Advisor
PF Gold
P: 11,155

This question doesn't make sense unless you specify what you're plotting the temperature against. 


Register to reply 
Related Discussions  
Redox Titration  Determining the % of Iron II and Iron III  Biology, Chemistry & Other Homework  4  
Redox Titration  Determining the % of Iron II and Iron III  Biology, Chemistry & Other Homework  0  
How to Separate Rust Iron (Fe2O3) into Ferum/Iron and Oxygen?  Chemistry  5  
Equilibrium temperature of ice, water, and iron cup  Introductory Physics Homework  1  
Why iron from a bloomery has less carbon than iron from a blast furnace?  General Engineering  0 