Latent Heat Q: 50g Ice Melting in 1kW Oven

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Homework Help Overview

The problem involves estimating the time required for 50g of ice to melt in a 1kW microwave oven, utilizing the specific latent heat capacity of ice. The original poster attempts to apply the formula for latent heat but questions the validity of their calculated time.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the application of the latent heat formula and raise concerns about unit consistency in the calculations. The original poster questions the correctness of their answer and seeks clarification on potential errors.

Discussion Status

Multiple participants have pointed out issues with unit checks, indicating that the discussion is focused on identifying errors in the original calculation. There is no explicit consensus on the correctness of the answer, but guidance has been offered regarding unit comparison.

Contextual Notes

The original poster expresses uncertainty about whether their answer is an overestimate or an underestimate, suggesting that assumptions regarding the setup may be under scrutiny.

CannonSLX
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Homework Statement


50g of ice is placed in a 1kW microwave oven and the oven is turned to full power. Estimate the time it will take for the ice to melt. The specific latent heat capacity of ice in 330kJ −1 kg . Is your answer likely to be an overestimate or an underestimate? Explain your reasoning.

Homework Equations


ΔQ=mL

The Attempt at a Solution


ΔQ=mL
1000xt=0.05x300
.:. t=0.0165 ?

This value seems very small :/
 
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Check your units
 
BvU said:
Check your units
Apologies, I had to do it really quickly. Is the answer correct though ?
 
No
 
BvU said:
No
Where have I gone wrong ?
 
Compare the units on the lefthand side with the units on the righthand side
 
Find it ?
 

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