Highschool physics problem

  • Thread starter kimkibun
  • Start date
  • #1
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Homework Statement


2 beakers of water, A and B, initially are at the same temperature. the temperature of the water in A is increased 15°F while at B it increased 15°K. after these temperature changes, which beaker of water has the higher temperature and by how much in °C?


Homework Equations



I will use the following conversion formulas for °C

°C=(°F-32)/1.8 (i)

°C=°K-273 (ii)

The Attempt at a Solution



Here's my solution, I'm going to convert the temperature of water beaker A to °C using (i) and for beaker B i will use (ii). is my solution correct?

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
PeterO
Homework Helper
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Homework Statement


2 beakers of water, A and B, initially are at the same temperature. the temperature of the water in A is increased 15°F while at B it increased 15°K. after these temperature changes, which beaker of water has the higher temperature and by how much in °C?


Homework Equations



I will use the following conversion formulas for °C

°C=(°F-32)/1.8 (i)

°C=°K-273 (ii)

The Attempt at a Solution



Here's my solution, I'm going to convert the temperature of water beaker A to °C using (i) and for beaker B i will use (ii). is my solution correct?

Homework Statement





Homework Equations





The Attempt at a Solution


The idea of converting the temperatures to Celcius is admirable, but you don't know either temperature, only by how much they changed.

I don't think there is a suggestion that one beaker starts at 15°F while the other starts at 15°K.

Perhaps they both started at 20°C - because they did start at the same temperature.
 
  • #3
30
1
The idea of converting the temperatures to Celcius is admirable, but you don't know either temperature, only by how much they changed.

I don't think there is a suggestion that one beaker starts at 15°F while the other starts at 15°K.

Perhaps they both started at 20°C - because they did start at the same temperature.

thanks for the reply sir! i think, knowing the initial temperature of two beakers is not necessary since what we need to compare is their temperature (in °C) after the said changes.
 
  • #4
PeterO
Homework Helper
2,426
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thanks for the reply sir! i think, knowing the initial temperature of two beakers is not necessary since what we need to compare is their temperature (in °C) after the said changes.

That is correct, but you were quoting formulas for converting actual temperatures, not converting changes in temperature.
 
Last edited:

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