Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
Glencoe Physical Science 2012 Student Edition (Glencoe Science) (McGraw-Hill Education)
1st Edition
ISBN: 9780078945830
Author: Charles William McLaughlin, Marilyn Thompson, Dinah Zike
Publisher: Glencoe Mcgraw-Hill
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Chapter 5, Problem 44R
To determine

The energy needed to raise the temperature of 4 kg of water.

Expert Solution & Answer
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Answer to Problem 44R

  Q=840kJ

Explanation of Solution

Given:

Mass, m=4 kg

Final temperature, T2=75oC

Initial temperature, T1=25oC

Heat capacity of water, cw=4200J/kgoC

Formula used:

Thermal energy can be calculated as:

  Q=mcw(ΔT)

Where,

  m = mass

  cw = Heat capacity of water

  (ΔT) = change in temperature

Calculation:

Plugging the values

  Q=4×4200×(7525)Q=840kJ

Conclusion:

Required thermal energy is Q=840kJ .

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