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A plastic tube of 7.6-cm-ID and 1.27-cm wall thickness has a thermal conductivity of 1.7 W/m K, a density of 2400 kg/m3 , and a specific heat of 1675 J/kg K. It is cooled from an initial temperature of 77°C by passing air at 20°C inside and outside the tube parallel to its axis. The velocities of the two airstreams are such that the coefficients of heat transfer are the same on the interior and exterior surfaces. Measurements show that at the end of 50 min, the temperature difference between the tube surfaces and the air is 10% of the initial temperature difference. A second experiment has been proposed in which a tube of a similar material with an inside diameter of 15 cm and a wall thickness of 2.5 cm will be cooled from the same initial temperature, again using air at 20°C and feeding it to the inside of the tube the same number of kilograms of air per hour that was used in the first experiment. The air-flow rate over the exterior surfaces will be adjusted to give the same heat transfer coefficient on the outside as on the inside of the tube. It can be assumed that the air-flow rate is so high that the temperature rise along the axis of the tube can be neglected. Using the experience gained initially with the 4.5-cm tube, estimate how long it will take to cool the surface of the larger tube to 27°C under the conditions described. Indicate all assumptions and approximations in your solution.
Redraw the circuit diagram of a CMOS 3-state buffer in Figure 3-49 using actual transistors instead of NANO, NOR, and inverter symbols. Can you find a circuit for the same function that requires a smaller total number of transistors? If so, draw i..
For this first part of the project, yourMIPSsimprogram will accept a binary input fileinputfilenameand givenoperationdiswill output tooutputfilenamethe MIPS disassembly of the input file.
List strengths, weaknesses, opportunities and threats that exist in broadband convergence
You are a Security professional hired by NextGard Technologies in Phoenix, AZ to provide a Windows security implementation model for their organization.
"Project Management and the Cycle Plan" Please respond to the following: Analyze the roles of the sponsor and the manager in project management. Select the role that you believe is more critical to the success of the project and explain why.
The World Trade Organization International Trade Statistics is an annual report that provides comprehensive, comparable, and updated statistics on trade in merchandise and commercial services. The report allows an assessment of world trade flows b..
What does IOC stands for in .net framework?
Given the following class definition, describe the type of variables used by the arguments and return values of the following member functions (values, pointers, or references):
Please write one page about research how NY state lottery deals with the time value of money between of lamp sum payment and annual?
Draw the hierarchy chart and then plan the logic for a program needed by the sales manager of The Henry Used Car Dealership. The program will determine the profit on any car sold
A company has 10 stores. Input the annual sales for each store. Find the store with the maximum sales, the one with the minimum sales, and find the average annual sales for the 10 stores. Print the maximum, minimum sales and their store index, and..
Compare error detection and correction facilities of interpreters and compilers. Compare static and dynamic linking. With respect to the requirements of modern applications, what are the shortcomings of 3GLs?
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