Solution Manual For Thermodynamics An Engineering Approach 10th Edition by Cengel Chapter (1-18)

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SOLUTIONSMANUAL ’




Thermodynamics:’An’Engineering’Approach
10th‟Edition
Yunus’A.’Çengel,’Michael’A.’Boles,’Mehmet’Kanoğlu
McGraw-Hill,‟2023




Chapter 1 INTRODUCTIO ’ ’


N AND BASIC CONCEPTS
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CYU - Check Your Understanding
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CYU’1-1’■’Check’Your’Understanding
CYU’1-1.1’Choose‟the‟wrong‟statement‟about‟the‟first‟law‟of‟thermodynamics.
(a) During‟an‟interaction,‟energy‟can‟change‟from‟one‟form‟to‟another.
(b) During‟an‟interaction,‟the‟total‟amount‟of‟energy‟remains‟constant.
(c) Energy‟can‟be‟destroyed‟but‟it‟cannot‟be‟created.
(d) Energy‟is‟a‟thermodynamic‟property.
(e) A‟system‟with‟more‟energy‟input‟than‟output‟will‟gain‟energy.

Answer:’(c)‟Energy‟can‟be‟destroyed‟but‟it‟cannot‟be‟created.


CYU’1-1.2’Which‟statement‟best‟expresses‟the‟second‟law‟of‟thermodynamics?
(a) The‟temperature‟of‟a‟well-sealed‟room‟increases‟when‟a‟fan‟in‟the‟room‟is‟turned‟on.
(b) A‟cup‟of‟cool‟coffee‟in‟a‟warm‟room‟never‟gets‟hot‟by‟itself.
(c) Heat‟is‟generated‟when‟there‟is‟friction‟between‟two‟surfaces.
(d) A‟household‟refrigerator‟supplies‟heat‟to‟the‟kitchen‟when‟operating.
(e) A‟person‟who‟has‟a‟smaller‟energy‟input‟than‟output‟will‟lose‟weight.

Answer:’(b)‟A‟cup‟of‟cool‟coffee‟in‟a‟warm‟room‟never‟gets‟hot‟by‟itself.




CYU’1-2’■’ Check’Your’Understanding
CYU’1-2.1’Which‟of‟the‟following‟is‟not‟a‟correct‟unit‟for‟work?
(a) kg’·’𝑚/𝑠2
(b) Nm
(c) kPa’·’𝑚3
(d) kJ
(e) kWh

Answer:’(a)‟kg’·’𝑚/𝑠2


CYU’1-2.2’Using‟unit‟considerations,‟select‟the‟correct‟equations.
I. Mass‟=„Force‟‟Acceleration
II. Work‟=„Force‟‟Distance
III. Work‟=„Power‟‟Time
IV. Density‟=„Mass‟‟Volume
(a) I‟and‟II
(b) I‟and‟III
(c) II‟and‟III
(d) I,‟II,‟and‟III
(e) II,‟III,‟and‟IV

Answer:’(c)‟II‟and‟III

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CYU’1-2.3’What‟is‟the‟weight‟of‟10‟kg?
(a) 10‟N
(b) 10‟lbf
(c) 9.8‟N
(d) 98‟N
(e) 322‟lbf

Answer:’(d)‟98‟N


𝑊’ =‘ mg’ =‘ (10’ kg)(9.8’ 𝑚/𝑠2)’ =‘ 98’ kg’·’𝑚/𝑠2’ =‘ 98’ 𝑁
since‟1’𝑁’ =‘ 1’kg’·’𝑚/𝑠2




CYU’1-3’■’ Check’Your’Understanding
CYU’1-3.1’Choose‟the‟wrong‟statement‟regarding‟systems‟and‟control‟volumes.
(a) The‟mass‟or‟region‟outside‟the‟system‟is‟called‟the‟ surroundings.
(b) The‟real‟or‟imaginary‟surface‟that‟separates‟the‟system‟from‟its‟surroundings‟is‟called‟the‟ boundary.
(c) The‟boundary‟has‟zero‟thickness.
(d) The‟boundary‟can‟neither‟contain‟any‟mass‟nor‟occupy‟any‟volume‟in‟space.
(e) The‟boundary‟of‟a‟system‟is‟fixed;‟it‟cannot‟ move.

Answer:’(e)‟The‟boundary‟of‟a‟system‟is‟fixed;‟it‟cannot‟move.


CYU’1-3.2’Choose‟the‟wrong‟statement‟regarding‟systems‟and‟control‟volumes.
(a) Both‟mass‟and‟energy‟can‟cross‟the‟boundary‟of‟a‟control‟volume.
(b) Mass‟cannot‟enter‟or‟leave‟a‟closed‟system‟but‟energy‟can.
(c) Mass‟can‟enter‟or‟leave‟an‟isolated‟system‟but‟energy‟cannot.
(d) The‟boundaries‟of‟a‟control‟volume‟can‟be‟real‟or‟imaginary.
(e) The‟volume‟of‟a‟closed‟system‟does‟not‟have‟to‟be‟fixed.

Answer:’(c)‟Mass‟can‟enter‟or‟leave‟an‟isolated‟system‟but‟energy‟cannot.




CYU’1-4’■’ Check’Your’Understanding
CYU’1-4.1’Which‟properties‟are‟intensive?
I. Volume,‟𝑚3
II. Density,‟kg/𝑚3
III. Temperature,‟C
IV. Pressure,‟kPa
(a) II‟and‟III
(b) III‟and‟IV
(c) I,‟II‟and‟III
(d) II,‟III,‟and‟IV
(e) I,‟II,‟III,‟and‟IV

Answer:’(d)‟II,‟III,‟and‟IV




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