A wind turbine with an efficiency of 0.21 is placed in a location where the wind is blowing with a constant speedof 6.9 m/s and the density of air is given to be 1.25 kg/m3. What should be the blade span of the turbine in mand 3 sf of the turbine to generate 2.7 kW? A pot contains water and is heated on a cooker. The cooker adds 23.3 kJ to the pot with 0.8 kJ lost to theenvironment. Find the stirring work needed to be added to it in kJ and 2 sf to achieve a total energy change of25.6 kJ.

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A pot contains water and is heated on a cooker. The cooker adds 23.3 kJ to the pot with 0.8 kJ lost to the environment. Find the stirring work needed to be added to it in kJ and 2 sf to achieve a total energy change of 25.6 kJ.

A pot contains water and is heated on a cooker. The cooker adds 23.3 kJ to the pot with 0.8 kJ lost to the environment. Find the stirring work needed to be added to it in kJ and 2 sf to achieve a total energy change of 25.6 kJ.

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

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Concept explainers

Work and Heat Transfer

It is generally related to thermal engineering which tells about the use, creation, conversion and transfer of heat energy between the systems. It is also considered that to transfer heat from one source to another, transfer of masses is also required. There are various mechanisms by which, transfer of heat takes place i.e. thermal conduction, convection, radiation or by change of phase. All these mechanisms have their own specific features which sometimes occur simultaneously within the same system.

Question

A wind turbine with an efficiency of 0.21 is placed in a location where the wind is blowing with a constant speed
of 6.9 m/s and the density of air is given to be 1.25 kg/m3. What should be the blade span of the turbine in m
and 3 sf of the turbine to generate 2.7 kW?

A pot contains water and is heated on a cooker. The cooker adds 23.3 kJ to the pot with 0.8 kJ lost to the
environment. Find the stirring work needed to be added to it in kJ and 2 sf to achieve a total energy change of
25.6 kJ.

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