General Thermal/Energy Physics Problem

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SUMMARY

The discussion centers around a thermal physics problem involving a steel electric kettle with a power rating of 2.5W. It explores the concept of thermal equilibrium between the kettle's metal wall and the water, asserting that they maintain close thermal equilibrium even during boiling. The problem also requires calculating the energy transferred to heat 0.75Kg of water from 20°C to 100°C, utilizing the specific heat capacity of water (4200 J/kg·K) and the kettle's energy absorption of 300J per Kelvin increase. Additionally, participants are tasked with determining the time required for this heating process.

PREREQUISITES
  • Understanding of thermal equilibrium concepts
  • Knowledge of specific heat capacity and its calculations
  • Familiarity with energy transfer equations in thermodynamics
  • Basic skills in algebra for solving equations
NEXT STEPS
  • Calculate energy transfer using the formula Q = mcΔT
  • Learn about the principles of thermal equilibrium in closed systems
  • Explore the relationship between power, energy, and time in heating processes
  • Investigate the specific heat capacities of different materials
USEFUL FOR

Students studying thermal physics, educators teaching energy transfer concepts, and anyone interested in practical applications of thermodynamics in everyday appliances like kettles.

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The Plug of a new steel, electric kettle says "power rating 2.5W"

a) The metal wall of the kettle and the water inside the kettle always remain close to thermal equilibrium, even when the water boils. Explain how this is true.

b) The kettle uses 300J to raise its temperature by 1 Kelvin. 0.75Kg of water with specific heat capacity 4200 JKgK is heated from 20'C to 100'C. Calculate the energy transferred during the process and state two assumptions you have made.

c) Calculate the time the process takes
 
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