Can someone tell me which formula to use here? (time to boil water)

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SUMMARY

The discussion revolves around calculating the time required for water to boil and subsequently evaporate in a broken kettle scenario. The water starts at a temperature of 20 °C and takes 1.5 minutes to reach boiling point. Participants are tasked with determining the time between boiling and complete evaporation, with options provided: 7.5 min, 4.5 min, 10 min, and 15 min. The correct approach requires applying thermodynamic principles and understanding the specific heat capacity of water.

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  • Understanding of thermodynamics, specifically heat transfer.
  • Knowledge of specific heat capacity of water.
  • Familiarity with the boiling point of water and evaporation concepts.
  • Basic mathematical skills for time and temperature calculations.
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  • Research the specific heat capacity of water and its implications in heating calculations.
  • Learn about the phase changes of water, focusing on boiling and evaporation.
  • Explore thermodynamic equations related to heat transfer and time calculations.
  • Investigate practical applications of these concepts in real-world scenarios, such as cooking or industrial processes.
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Students studying physics, engineers involved in thermal systems, and anyone interested in the practical applications of thermodynamics in everyday situations.

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Homework Statement
Can someone tell me which formula to use here
Relevant Equations
P = W/Δt <=> Δt = W/P = Q/P.
Q= I evaporate water . m
This is the only formula I'm thinking of, but it doesn't work here I think
An amount of water at a temperature of 20 °C is passed through a water boiler in 1.5 min to
brought to boiling point. The kettle is broken and does not jump off.
The time between the moment when the water reaches boiling point and the moment when all the water
is evaporated, is equal to:
a) 7,5 min.
b) 4,5 min.
c) 10 min.
d) 15 min.
 
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