FREE Trial

A thin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. The rod (A) has a thermal conductivity of k A = 0.15 W/m. K, while

A thin electrical heater is inserted between a long circular rod and a concentric tube with inner and outer radii of 20 and 40 mm. The rod (A) has a thermal conductivity of k A = 0.15 W/m. K, while the tube (B) has a thermal conductivity of k B = 1.5 W/m. K and its outer surface is subjected to convection with a fluid of temperature T∞ = -15°C and heat transfer coefficient 50 W/m2 ∙ K. The thermal contact resistance between the cylinder surfaces and the heater is negligible.

(a) Determine the electrical power per unit length of the cylinders (W/m) that is required to maintain the outer surface of cylinder B at 5°C.

(b) What is the temperature at the center of cylinder A?

This problem has been solved!


Do you need an answer to a question different from the above? Ask your question!
  • Tutor Answer

KNOWN Thin electrical heater fitted between two concentric cylinders the outer surface of which expe…View the full answer


answer-question
Related Book For  answer-question
Fundamentals of Heat and Mass Transfer

Fundamentals of Heat and Mass Transfer

ISBN: 978-0471457282

6th Edition

Authors: Incropera, Dewitt, Bergman, Lavine

See More Books
Question Details
Chapter # 3
Section: Problems
Problem: 41
Posted Date: September 23, 2010 05:59:11
See More Questions

Students also viewed these Mechanical Engineering questions

Q:
A hollow sphere with inner and outer radii of R1 and R2, respectively, is covered with a layer of insulation having an outer radius of R3. Derive an expression for the rate of heat transfer through...
A:
Let k 12 the thermal conductivity of the......
Q:
A thin electrical heater is wrapped around the outer surface of a long cylindrical tube whose inner surface is maintained at a temperature of 5C. The tube wall has inner and outer radii of 25 and 75...
A:
KNOWN Inner and outer radii of a tube wall which is heated electrically at its outer surface......
Q:
A thin electrical heater dissipating 4000 W/m 2 is sandwiched between two 25-mm-thick plates whose exposed surfaces experience convection with a fluid for which Too = 20C and h = 400 W/m 2 . K. The...
A:
KNOWN Thin electrical heater dissipating 4000 Wm sandwiched between two 25mm thick plates whose surfaces experience convection FIND a On Tx coordinates sketch the steadystate temperature distribution......
Q:
What is the one greatest strength of a pluralistic society? What is the one greatest weakness? Do these characteristics work for or against business?
A:
The textbook lists several strengths prevents power from being concentrated maximizes freedom of exp......
Q:
Compare party and party costs to solicitor and client costs. To whom are these costs generally awarded?
A:
Either solicitorclient or partyparty costs are awarded to the victor and paid by the......
Q:
Quebec Traffic Company had a fire on March 10, 2020, that destroyed a major portion of its inventory. The salvaged accounting records contained the following information: Sales, January 1 to March 10...
A:
2019 Gross profit ratio Sales 3300000 Cost of sales 1782000 Gross margin 1518000 Gross profit rat......
Q:
Paul and Donna Decker are married taxpayers, ages 44 and 42, respectively, who file a joint return for 2022. The Deckers live at 1121 College Avenue, Carmel, IN 46032. Paul is an assistant manager at...
A:
Pauls salary Donnas salary Dividends State income tax refund Longterm capital gain Note 1 Adjusted g......
Q:
During the fourth quarter of 2018, there were seven biweekly paydays on Friday (October 5, 19; November 2, 16, 30; December 14, 28) for Quality Repairs. Using the forms supplied on pages 4-46 to...
A:
a FEDERAL DEPOSIT INFORMATION WORKSHEET To be deposited on or before November 15 2018 FEDERAL DEPOS......
Q:
Make a function called symmetricDifference that takes two strings: word1 and word2 as parameters and returns a unique list of the letters that do not occur in both words in ascending order. Define a...
A:
Implementation of the symmetricDifference function and the main function to achieve the desired func......
Q:
Consider a linear FM waveform that sweeps from 9.5 to 10.5 GHz over a pulse length of 20 s. That is the bandwidth . What is the time-bandwidth product? What will be the Rayleigh resolution (peak to...
A:
A linear Fm wave form that sweeps from 95 to 105 GHZ over pulse lengt......
Q:
Superheated steam at 575C is routed from a boiler to the turbine of an electric power plant through steel tubes (k = 35 W/m K) of 300 mm inner diameter and 30 mm wall thickness. To reduce heat loss...
A:
KNOWN Diameter wall thickness and thermal conductivity of steel tubes Temperature of steam flowing through the tubes Thermal conductivity of insulatio......
Q:
A wire of diameter D = 2 mm and uniform temperature T has an electrical resistance of 0.01 n/m and a current flow of 20 A. (a) What is the rate at which heat is dissipated per unit length of wire?...
A:
KNOWN Electric current and resistance of wire Wire diameter and emissivity Thickness emissivity and thermal conductivity of coating Temperature of amb......
Q:
Explain what is meant by group depreciation. Under what circumstances is such a method appropriate?
A:
Group depreciation is applied to situations where average deprec......
Q:
Which one of the following items is not included in the annual carrying costs of inventory? (a) Cost of capital (b) Insurance on inventory (c) Annual warehouse depreciation (d) Taxes on inventory (d)...
A:
The correct answer is d Inventory breakage on stored inventory Inve......
Q:
Distinguish between cost reduction and cost control.
A:
Cost Reduction and Cost Control are both important concepts in the field of financial management but they have distinct meanings and approaches Lets distinguish between the two Cost Reduction Definiti......
Q:
What do you mean by cost reduction? How is it different from cost control?
A:
Cost Reduction and Cost Control are two related but distinct concepts in the field of business management and finance Cost Reduction Cost reduction re......
Q:
Name a cost which is reflected in the accounting system but not used in decision making?
A:
One example of a cost that is reflected in the accounting system but might no......
Q:
Explain the meaning of relevant costs in managerial decisions. Give examples.
A:
Relevant costs play a crucial role in managerial decisionmaking by helping managers assess the potential outcomes of various choices These costs are the expenses or financial impacts that are directly......
Q:
List some training activities in which you have participated that were beneficial to you.Why did you enjoy them?How did they help you to learn?What training principles noted in this chapter were...
A:
Specific training principles noted in the chapter and ask students......
Q:
Teasdale Inc. manufactures and sells commercial and residential security equipment. The comparative unclassified balance sheets for December 31, 2015 and 2014 are provided below. Selected missing...
A:
a 147200from table b 4680 151880 147200 from table c 151880from table Market Cost per Value per No of Share or Share or Shares or 100 of 100 of Total......
Q:
Use loop analysis to find Io in the network shown. 1 1 12V 4mA
A:
12V 1 1K0 1 www 4mA I 12 14 2......
Q:
Use loop analysis to find Vo in the network shown. 1 1 12V 4mA
A:
3mA I 14 12 12 1mA......
Q:
Find Vo in the network shown. 4mA mA. 2KO 1 1 TmA
A:
4mA 1 I 1 13 1 1mA......
Q:
Identify and explain agency theory, stakeholder theory, legitimacy theory and agency cost theories for the Article Article: Clarke, Melissa, Federal Government threatens to build gas plant if...
A:
Agency theory is a theory that explains the relationship between principals and agents in a business......
Q:
It is essential that children and their families understand healthy choices concerning the food they eat. Early childhood professionals should understand and implement safe food-handling procedures....
A:
Children indoor and outdoor learning activities should be cautiously selected This position is informed by the fact that there is no one fit all activities which should address the needs of all age gr......
Q:
It is essential that a leader also be able to evaluate the contributions of each member of their group and how each individual helped achieve the objective, develop the team, and develop the people....
A:
Multab This group member could be ranked in the fourth stage of Were Great This was because he cared......
Q:
Suppose the comparative balance sheets of Sage Hill Inc.. are presented here. SAGE HILL INC. Condensed Balance Sheet May 31 ($ in millions) 2019 2018 Assets Current Assets $9,680 $8,760 Property,...
A:
Click to View...
Q:
Isaac Newton, having convinced himself (erroneously as it turned out) that chromatic aberration is an inherent property of refracting telescopes, invented the reflecting telescope, shown...
A:
a The discussion in the textbook of the refracting telescope a subsection of 348 applies to the Newt......
Q:
Dad wants to understand how to stop his son's behavior of begging for candy at the checkout counter. The psychologist teaches him that to stop of behavior, he needs to stop rewarding the behavior....
A:
AnswerScenario 1 Extinction In this scenario the childs behavior is begging for candy at the checkout counter The key concept at play here is extincti......
Q:
Adele Weiss manages the campus flower shop. Flowers must be ordered three days in advance from her supplier in Mexico. Although Valentine's Day is fast approaching, sales are almost entirely...
A:
The payoff table for this problem is a Under the maximin criteria Weiss should order 25 dozen......
Q:
A model rocket is fired vertically upward from rest. Its acceleration for the first three seconds is a (t) = 60t, at which time the fuel is exhausted and it becomes a freely falling body. Fourteen...
A:
a For 0 t 3 we have at 60tvt 30t C v00Cvt 30t so st 10t C s00C st 10t Note that v3 270 and s3 270 F......
Q:
As we read in Nicholas Carr's work and discussed in the lecture, some argue that technology has a profound and direct effect on how we think, including how we consume information, and how we define...
A:
Certainly the impact of new media on how we think and interact with information and the world around us is a complex and multifaceted topic While I do......
Q:
In free space, E 20 cos (wt 50x) a V/m. Calculate (a) J (b) H (c) w
A:
A JddDdt odEdt 20 o sin50xAy Am2 B......
Q:
Suppose that X, Y, and Z are jointly distributed random variables, that is, they are defined on the same sample space. Suppose that we also have the following. E(X) = 1 E(Y) =0 E(Z) = 4 Var (X) = 23...
A:
Given EX1 EY0 EZ4 VarX23 VarY46 VarZ30 1E55X 55EXAs EaW......
Q:
You have been hired by Dillard to prepare adjusting entries and financial statements for 2019. Previously Rinky Dink Accounting had been performing such tasks. The following information was gathered...
A:
Click to View...
Q:
Cherry Ltd purchased 100% of the shares of Durian Ltd on 1 July 2018 for $155,000. At that date the equity of Durian Ltd was as follows: Share capital 60,000 shares $ 60,000 General reserve 36,000...
A:
Answer Determine the Goodwill as at the Acquisition Date Goodwill is the difference between the cost of acquisition of an entity and the fair value of its net assets Goodwill is calculated as follows......
Q:
Review the basic conflict model discussed in this chapter. What lessons for management follow from this model?
A:
The basic conflict model typically includes several key stages which may vary slightly depending on the source but generally involve 1 Latent Conflict This is the stage where potential conflicts exist......
Q:
What purposes does an organizations culture serve when considering the external environment?
A:
An organizations culture serves several important purposes when considering the external environment Culture plays a crucial role in shaping how an organization interacts with its external.........
Q:
How can employee diversity give a company a competitive advantage?
A:
Employee diversity can provide a company with several competitive advantages which can positively impact its performance innovation and overall success Here are ways in which diversity among employees......
Q:
Explain the McKinsey 7-S model.
A:
The McKinsey 7S model is a management framework developed by consultants at McKinsey Company in the late 1970s It is designed to help organizations an......
Q:
Do you think its true that every organization has a hidden functional structure in it? Explain your answer.
A:
Yes it is generally true that every organization has a hidden functional structure within it This hidden functional structure is often referred to as......
Q:
The Able Company has a warehouse with 6 storage bays, each with 12,000 cu. ft. storage space available. The bays are numbered in increasing order of distance to outbound dock. The warehouse processes...
A:
Click to View...
Q:
What did Lennox gain by integrating their WMS, TMS, and labor management systems?
A:
Shipping accuracy went from 98 to 9997 Inventory accuracy went from 97......
Q:
Question 7 2 pts The glycosidic linkage (b-N-Glycosidic Bond) in RNA and DNA nucleotides: links the base to the phosphate moiety is susceptible to proteolysis links the base to the sugar moiety is a...
A:
O links the base to the sugar moiety O is a special form of hydrogen bon......
Q:
The subjects for the study described in Example 12 were evaluated for abstinence from cigarette smoking at the end of 12 months. The table shows the percentage in each group that were abstaining. a....
A:
a Nicotine patch only 1244 100 0064 100 64......
Q:
In Exercises, compute AB by block multiplication, using the indicated partitioning a. b. 00:11 31:00 2100 0 0|3 0 I 1-0 -00 01 42 10 53 0012 0 4
A:
a We have the block structure Now the blocks A 12 A 21 B 12 and B 21 are all zero blocks so any pr......
Q:
Ag Bio Tech (ABT) was organized on January 1, 2013, by four friends. Each organizer invested $10,000 in the company and, in turn, was issued 8,000 shares of common stock. To date, they are the only...
A:
tr msoheightsourceauto col msowidthsourceauto br msodataplacementsamecell style16 msonumberformat 000 000 00220022 msostylenameComma msostyleid3 style17 msonumberformat00220022 00000220022......
Q:
How can organizations select and develop effective leaders?
A:
Organizations can help build effective organizations through t......
Q:
Determine Vo1, Vo2, and I for the network of Fig. 2.157. 0.47 k 20V S
A:
Both diodes forwardbiased V o1 07 V......
Q:
Alyssum Ltd has been a client of Geoff & Aleida Partners for many years. You are an audit senior and have been assigned to the Alyssum audit for the first time for the financial year end 30 June...
A:
Click to View...
Q:
The following table shows the transactions experienced by J G Gutter Works (JGGW) during Year 7. The table contains missing data which are labeled with alphabetic characters (a) through (j). Assume...
A:
a The answers are shown in the order in which they were calculated In other words item d was calculated first g second and so on There are other possi......
Q:
During the past few years, Joseph Company has taken out the following loans from the bank: 1. On June 1, 2026, Joseph Company borr owed $60,000 on a 13%, 10-month note payable 2. On March 1, 2026,...
A:
Click to View...
Q:
Compute the given arithmetic expression and give the answer in the form a + bi for a, b R. (2 - 3i)(4 + i) + (6 - 5i)
A:
2 3i4 i 6 5i......
Q:
In Exercises, decide whether the object described is indeed a set (is well defined). Give an alternate description of each set. {n Z | 39 < n 3 < 57}
A:
The set......
Q:
How did you feel about receiving feedback on your group performance? To what extent did you find the feedback helpful? How might that process be improved?
A:
They tend to feel more comfortable receiving feedback than providing it Of......
Q:
How do the perspectives on competitive advantage differ when comparing brick-and-mortar stores to online businesses (e.g., Best Buy versus Amazon, Barnes & Noble versus Amazon, Old Navy versus Thread...
A:
The perspectives on competitive advantage between brickandmortar stores and online businesses differ significantly due to the inherent differences in their business models customer interactions and op......
Q:
In analyzing hits by V-1 buzz bombs in World War II, South London was partitioned into 576 regions, each with an area of 0.25 km2. A total of 535 bombs hit the combined area of 576 regions. Assume...
A:
In this problem we want to find the probability that a randomly selected region had exactly two hits......
Q:
The chapter notes that global strategy can change over time for a firm. MTV is highlighted as one example in Exhibit 10.8. Conduct a web search of a firm you know to be operating internationally and...
A:
According to the exhibit MTV started with a globalstandardization strategy which means that it produced and distributed the same content in all market......
Q:
Agriculture is one of the largest and oldest industries in the world. In the United States and many other countries, farmers often struggle to turn a profit given the variabilities of weather and...
A:
Potential Industries for Tourist or Recreational Revenues Several other industrial or commercial industries could potentially benefit from tourist or recreational revenues in a manner similar to the a......
Q:
The MBA oath (shown in Exhibit 12.4) says in part, My decisions affect the well-being of individuals inside and outside my enterprise, today and tomorrow. One example of a large firm reorienting...
A:
Benefits of the program for PepsiCo Improved Supplier Relationships By directly contracting with small farmers PepsiCo can establish stronger and more reliable relationships with its suppliers This ca......
Q:
The reported net incomes for the first 2 years of US Books Corp. were as follows: 2013, $268,000; and 2014, $412,000. Early in 2015, the following errors were discovered. 1. Depreciation of equipment...
A:
Retained Earnings 44100 Accumulated DepreciationEquipment 68500 39000 29500 Computa......
Q:
The swap spread is the difference between the swap rate and the equivalent-maturity Treasury bond yield. Explain why a widening swap spread may be a signal of deteriorating economic conditions. Plot...
A:
The ability of the fixedrate payer to make the scheduled paymen......
Funds Of Identity Connecting Meaningful Learning Experiences In And Out Of School Learning In Doing Social Cognitive And Computational Perspectives 1st Edition - ISBN: 1107147115 - Free Book