(a) How much energy is required to bring a 1.0-L pot of water at 20 C to 100 C? (b) For how long could this amount of energy run a 60-W lightbulb?
Part(a)To determine:
Energy required to boil a litre of water
Answer to Problem 11P
Solution:
Energy required to boil a litre of water is 334880 J
Explanation of Solution
Given:
is to be determined
of water is 4186 J/kgK
is mass
is density of water is 1000 kg/cu.m
is volume which is 1 L
is 100 C
is 20 C
Formula Used:
The formula used is the relation between temperature and specific heat from thermodynamics
Where,
is the heat transferred
is the specific heat
is the mass
is the final temperature
is the initial temperature
Calculation:
The mass of water is determined by the multiplying density
with volume
Volume
by the multiplying is 1 L. 1000 L is 1 cu.m. So 1 L is 0.001 cu.m.
Mass is now
kg
Inserting the given values in the heat capacity formula:
J
Part(b)To determine:
The duration a light bulb will last for a given energy.
Answer to Problem 11P
Solution:
The duration a light bulb will last is 5581 seconds.
Explanation of Solution
Given:
is 334880 J from part(a)
is 60 W
Formula Used:
Formula for power
Where,
is the heat transferred
is Power
is time
Calculation:
An energy source of energy will run the light bulb for a certain time. If power of the bulb is known then one can calculate the time.
The formula is
is 334880 J from part(a)
is 60 W
Substituting the values above
seconds
Chapter 14 Solutions
Physics: Principles with Applications
Additional Science Textbook Solutions
The Cosmic Perspective Fundamentals (2nd Edition)
University Physics (14th Edition)
Lecture- Tutorials for Introductory Astronomy
Essential University Physics (3rd Edition)
- College PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage LearningUniversity Physics (14th Edition)PhysicsISBN:9780133969290Author:Hugh D. Young, Roger A. FreedmanPublisher:PEARSONIntroduction To Quantum MechanicsPhysicsISBN:9781107189638Author:Griffiths, David J., Schroeter, Darrell F.Publisher:Cambridge University Press
- Physics for Scientists and EngineersPhysicsISBN:9781337553278Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningLecture- Tutorials for Introductory AstronomyPhysicsISBN:9780321820464Author:Edward E. Prather, Tim P. Slater, Jeff P. Adams, Gina BrissendenPublisher:Addison-WesleyCollege Physics: A Strategic Approach (4th Editio...PhysicsISBN:9780134609034Author:Randall D. Knight (Professor Emeritus), Brian Jones, Stuart FieldPublisher:PEARSON