The total quantity of heat received by the soup

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Discussion Overview

The discussion revolves around a homework problem involving the calculation of the total quantity of heat received by frozen soup as it is heated in a microwave. The problem includes various specific heat capacities, latent heat of fusion, and temperature changes, requiring participants to apply thermodynamic equations.

Discussion Character

  • Homework-related, Mathematical reasoning, Debate/contested

Main Points Raised

  • The initial calculation presented by the student includes the use of specific heat capacities and latent heat to find the total heat received, resulting in a total of 270600 J.
  • Some participants, like mms0101, express agreement with the student's calculations, indicating they do not see any errors.
  • Another participant, Ratch, questions the teacher's provided answer of 2671000 J, suggesting it may be incorrect.
  • A later reply indicates the student plans to discuss the discrepancy with the teacher, implying ongoing uncertainty about the correct answer.

Areas of Agreement / Disagreement

There is no consensus on the correctness of the teacher's answer, with some participants supporting the student's calculations while others question the teacher's response. The discussion remains unresolved regarding the correct total heat calculation.

Contextual Notes

The discussion does not clarify the assumptions made in the calculations, such as the treatment of phase changes or the accuracy of specific heat values used. There is also a lack of detail on how the teacher arrived at their answer.

mms0101
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Homework Statement


frozen soup of a mass of 0,40kg enters a microwave at -15°C. after 6 minutes the soup eaches a ° of 75°C
SHC of soup at solid state : c = 2100J/kg°C
SHC of liquid soup : c = 4200K/kg°C
SLH of fusion of soup : Lf = 330 000J/kg
melting point of soup : 0°C
THE QUESTION : WHAT IS THE TOTAL QUANTITY OF HEAT RECEIVED BY THE SOUP ?

Homework Equations


E = mcΔt
E= mL

The Attempt at a Solution


E = mcΔT
= 0,4 x 2100 x 15
=12600 J

E = mL
= 0,4 x 330 000
=132000J

E = mcΔT
= 0,4 x 4200 x 75
=126000

Etot = 132,000 + 12600 + 126000
=270600 J

teachers answer : 2 671 000 J
i have no idea how to get to it i am in my 5th year at the european school

Homework Statement


Homework Equations


The Attempt at a Solution

 
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mms0101,

I can't see anything wrong with your answer.

Ratch
 
You're right, teach is wrong. Sure that was his answer?
 
ill go talk to him tomorrow as i have another answer to do with circuits that mismatch his ill let you know :) thank you anyway
 

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