Explanation Given: Rate of melting of snow = 0.1kg/s Heat of fusion of water = 334J/kg (for water at 0 o C) L = 50 × 10 − 3 m A = 25 m 2 k = 1.4 W / m . K Calculation: The amount of heat supplied, Q ˙ = 0.1 × 10 3 × 334 J / s Q ˙ = 33400 J / s The value of R, R = L k A On substituting the values of L = 50 × 10 − 3 m A = 25 m 2 k = 1.4 W / m . K We have, R = 50 × 10 − 3 m ( 1.4 W / m

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ISBN: 9780073398198

Author: CENGEL

Publisher: RENT MCG

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Question

Chapter 1, Problem 61P

To determine

Whether the concrete slab with an embedded heating cable would operate in accordance with the NFPA 70 code.

Whether the current operating conditions allow T1−T2≤21°C .

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Chapter 1, Problem 60P

Chapter 1, Problem 62EP

Chapter 1 Solutions

HEAT+MASS TRANSFER:FUND.+APPL.

Ch. 1 - How does the science of heat transfer differ from...Ch. 1 - What is the driving force for (a) heat transfer,...Ch. 1 - How do rating problems in heat transfer differ...Ch. 1 - What is the difference between the analytical and...Ch. 1 - What is the importance of modeling in engineering?...Ch. 1 - When modeling an engineering process, how is the...Ch. 1 - On a hot summer day, a student turns his fan on...Ch. 1 - Consider two identical rooms, one with a...Ch. 1 - Prob. 9CP Ch. 1 - Prob. 10CP

Ch. 1 - Prob. 11CP Ch. 1 - An ideal gas is heated from 50C to 80C (a) at...Ch. 1 - What is heat flux? How is it related to the heat...Ch. 1 - What are the mechanisms of energy transfer to a...Ch. 1 - A logic chip used in a computer dissipates 3 W of...Ch. 1 - Consider a 150-W incandescent lamp. The filament...Ch. 1 - A 15-cm-diameter aluminum ball is to be heated...Ch. 1 - A 60-gallon water heated is initially filled with...Ch. 1 - Prob. 19P Ch. 1 - Prob. 20P Ch. 1 - Prob. 21P Ch. 1 - Prob. 22P Ch. 1 - Prob. 23P Ch. 1 - Prob. 24P Ch. 1 - Prob. 25P Ch. 1 - Prob. 26P Ch. 1 - A 5-m6-m8-m room is to be heated by an electrical...Ch. 1 - Prob. 28P Ch. 1 - Air enters the duct of an air-conditioning system...Ch. 1 - Prob. 30P Ch. 1 - Define thermal conductivity, and explain its...Ch. 1 - Which is a better heat conductor, diamond or...Ch. 1 - How do the thermal conductivity of gases and...Ch. 1 - Why is the thermal conductivity of superinsulation...Ch. 1 - Why do we characterize the heat conduction ability...Ch. 1 - What are the mechanisms of heat transfer? How are...Ch. 1 - Write down the expression for the physical laws...Ch. 1 - How does heat conduction differ from convection?Ch. 1 - Does any of the energy of the sun reach the earth...Ch. 1 - How does forced convection differ from natural...Ch. 1 - What is the physical mechanism of heat conduction...Ch. 1 - Consider heat transfer a windowless wall of house...Ch. 1 - Consider heat loss through two walls of house on a...Ch. 1 - Consider two houses that are identical except that...Ch. 1 - Consider two walls of a house that are identical...Ch. 1 - Define emissivity and absorptivity. What is...Ch. 1 - What is a blackbody? How do real bodies differ...Ch. 1 - A wood slab with a thickness 0.05 m is subjected...Ch. 1 - Prob. 49P Ch. 1 - Prob. 50EP Ch. 1 - The inner and outer surfaces of a 0.5-cm thick...Ch. 1 - Prob. 52P Ch. 1 - Prob. 53P Ch. 1 - The north wall of an electrically heated home is...Ch. 1 - Prob. 55P Ch. 1 - Prob. 56P Ch. 1 - Prob. 57P Ch. 1 - A concreate wall a surface area of 20 m2 and a...Ch. 1 - Prob. 59P Ch. 1 - Prob. 60P Ch. 1 - Prob. 61P Ch. 1 - Prob. 62EP Ch. 1 - Air at 20C with a convection heat transfer...Ch. 1 - Prob. 64P Ch. 1 - Prob. 65P Ch. 1 - Prob. 66P Ch. 1 - Prob. 67P Ch. 1 - Prob. 68P Ch. 1 - Prob. 69P Ch. 1 - Prob. 70P Ch. 1 - Prob. 71P Ch. 1 - Prob. 72EP Ch. 1 - Prob. 73P Ch. 1 - Prob. 74P Ch. 1 - Prob. 75P Ch. 1 - Prob. 76P Ch. 1 - Using the conversion factors between W and Btu/h,...Ch. 1 - The outer surface of a spacecraft in space has an...Ch. 1 - Consider a person whose expose surface are is 1.7...Ch. 1 - Prob. 80P Ch. 1 - Two surfaces, one highly polished and the other...Ch. 1 - A spherical interplanetary probe with a diameter...Ch. 1 - Prob. 83P Ch. 1 - Can all three modes of heat transfer occur...Ch. 1 - Can a medium involve (a) conduction and...Ch. 1 - The deep human body temperature of a healthy...Ch. 1 - We often turn the fan on in summer to help us...Ch. 1 - Prob. 88P Ch. 1 - Prob. 89P Ch. 1 - Prob. 90P Ch. 1 - An electronic package with a surface area of 1 m2...Ch. 1 - Consider steady heat transfer between two large...Ch. 1 - Prob. 93P Ch. 1 - Prob. 94P Ch. 1 - A 2-in-diameter spherical ball whose surface is...Ch. 1 - Prob. 96P Ch. 1 - Prob. 97P Ch. 1 - A 3-m-internal-diameter spherical tank made of...Ch. 1 - Prob. 99P Ch. 1 - Solar radiation is incident on a 5-m2 solar...Ch. 1 - Prob. 101P Ch. 1 - Prob. 102P Ch. 1 - Prob. 103EP Ch. 1 - An AISI 304 stainless steel sheet is going through...Ch. 1 - Prob. 105P Ch. 1 - Prob. 106P Ch. 1 - Prob. 107P Ch. 1 - Prob. 108CP Ch. 1 - Prob. 109P Ch. 1 - Prob. 110P Ch. 1 - Prob. 111P Ch. 1 - Prob. 112P Ch. 1 - Prob. 113CP Ch. 1 - Why is the metabolic rate of women, in general,...Ch. 1 - What is asymmetric thermal radiation How does it...Ch. 1 - How do (a) draft and (b) cold floor surfaces cause...Ch. 1 - Prob. 117CP Ch. 1 - Why is it necessary to ventilate buildings? What...Ch. 1 - Consider a house in Atlanta, Georgia, that is...Ch. 1 - Prob. 120P Ch. 1 - A 4m5m6m and room is to be heated by one ton (1000...Ch. 1 - Engine valves (cp=440J/kg.Kandp=7840kg/m3) are to...Ch. 1 - Prob. 123P Ch. 1 - Prob. 124P Ch. 1 - A 0.3 -cm-thick, 12-cm-high, and 18-cm-long...Ch. 1 - A 40-cm-long, 800-W electric resistance heating...Ch. 1 - It is well known that wind makes the cold air feel...Ch. 1 - An engine block with a surface area measured to be...Ch. 1 - Prob. 129P Ch. 1 - Prob. 130P Ch. 1 - Prob. 131P Ch. 1 - Consider a person standing in a room maintained at...Ch. 1 - Prob. 133P Ch. 1 - Prob. 134P Ch. 1 - Prob. 135P Ch. 1 - Prob. 136P Ch. 1 - Prob. 137P Ch. 1 - Prob. 138P Ch. 1 - Prob. 139P Ch. 1 - Prob. 140P Ch. 1 - Prob. 141P Ch. 1 - Prob. 142P Ch. 1 - A 2-kW electric resistance heater submerged in...Ch. 1 - Prob. 144P Ch. 1 - A cold bottled drink (m=2.5kg,cp=4200J/kg.K) at...Ch. 1 - Prob. 146P Ch. 1 - Air enters a 12-m-long, 7-cm-diameter pipe at 50oC...Ch. 1 - Prob. 148P Ch. 1 - Steady heat conduction occurs through a...Ch. 1 - Heat is lost through a brick wall (k=0.72W/m.K),...Ch. 1 - Prob. 151P Ch. 1 - A 40-cm-long, 0.4-cm-diameter electric resistance...Ch. 1 - Prob. 153P Ch. 1 - Prob. 154P Ch. 1 - Over 90 percent of the energy dissipated by an...Ch. 1 - On a still, cleat night, the sky appears to be a...Ch. 1 - Prob. 157P Ch. 1 - Prob. 158P Ch. 1 - A persons head can be approximated as a...Ch. 1 - A person standing in a room loses heat to the air...Ch. 1 - Write an essay on how microwave ovens work, and...Ch. 1 - Using information form the utility bill for the...Ch. 1 - It is well know that at the same outdoor air...

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