Is a Rate of 100K/s an Intuitively Offensive Way to Measure Temperature Change?

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Homework Help Overview

The discussion revolves around the measurement of temperature change in a thermal physics context, specifically questioning the intuitiveness of a rate of 100 K/s as a measure of temperature change.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants discuss the appropriateness of a given approach to the problem, questioning the correctness of results derived from thermal equations. There is an exploration of the implications of a high rate of temperature change and its physical feasibility.

Discussion Status

The discussion is active, with participants raising questions about the validity of results and assumptions made in calculations. Some guidance has been offered regarding the interpretation of units and the implications of the heating rate, but no consensus has been reached.

Contextual Notes

Participants note the significance of units such as kilowatts for power input and kilograms for mass, which are crucial for understanding the calculations involved. There is also mention of potential oversight in computations that could lead to the perceived high rate of temperature change.

Bolter
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Homework Statement
Thermal physics
Relevant Equations
Q=m*c*deta t
Question:

Screenshot 2019-12-06 at 17.04.12.png

This would be the right approach to do this problem?
IMG_3423.JPG


Thanks!
 
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Bolter said:
Homework Statement:: Thermal physics
Homework Equations:: Q=m*c*deta t

Question:

View attachment 253759
This would be the right approach to do this problem?
View attachment 253760

Thanks!
Correct approach. Incorrect result.
 
Bystander said:
Correct approach. Incorrect result.
Why is it an incorrect result?
 
Bolter said:
Why is it an incorrect result?
I think your answer is correct. I hope I'm not overlooking something trivial.
 
Three orders of magnitude too large.
 
Bystander said:
Three orders of magnitude too large.
Note that the power input is given in kilowatts.
 
TSny said:
in kilowatts.
..., and mass in kilograms.
 
Bystander said:
..., and mass in kilograms.
Yes. From m and c you can see that it takes about 100 J to raise T by 1 K. Heat is going in at about 10,000 J each second. So T will increase about 100 K each second.
 
o:). Looking at the faint decimal point in "nine point eight one" and figuring he'd missed that in his computation; wasn't paying attention...100K/s? Intuitively offensive, but...o:)o:)
 
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  • #10
Bystander said:
...100K/s? Intuitively offensive
Yes. That rate of heating would not last long. :oldsmile:
 

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