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Get Full Access to Physics: Principles With Applications - 6 Edition - Chapter 15 - Problem 28p
Get Full Access to Physics: Principles With Applications - 6 Edition - Chapter 15 - Problem 28p

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# At a steam power plant, steam engines work in pairs, the ISBN: 9780130606204 3

## Solution for problem 28P Chapter 15

Physics: Principles with Applications | 6th Edition

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Problem 28P

Problem 28P

At a steam power plant, steam engines work in pairs, the output of heat from one being the approximate heat input of the second. The operating temperatures of the first are 670°C and 440°C, and of the second 430°C and 290°C. If the heat of combustion of coal is 2.8 × 107 J/kg, at what rate must coal be burned if the plant is to put out 1100 MW of power? Assume the efficiency of the engines is 60% of the ideal (Carnot) efficiency.

Step-by-Step Solution:

SolutionStep 1 of 5In order to calculate the energy transferred to each eardrum per second at 30 m fromthe loudspeaker , first we need to find the intensity of sound on the eardrum.Intensity of a sound is the energy transmitted per unit area perpendicular to thedirection of propagation per unit time.Since energy per unit time is given by power.The intensity can be defined as the power radiated per unit area perpendicular to thedirection of propagation.That is I = P AWhere I is the intensity, P is the power and A is the area.

Step 2 of 5

Step 3 of 5

##### ISBN: 9780130606204

This textbook survival guide was created for the textbook: Physics: Principles with Applications, edition: 6. This full solution covers the following key subjects: heat, coal, efficiency, Engines, plant. This expansive textbook survival guide covers 35 chapters, and 3914 solutions. The full step-by-step solution to problem: 28P from chapter: 15 was answered by , our top Physics solution expert on 03/03/17, 03:53PM. The answer to “At a steam power plant, steam engines work in pairs, the output of heat from one being the approximate heat input of the second. The operating temperatures of the first are 670°C and 440°C, and of the second 430°C and 290°C. If the heat of combustion of coal is 2.8 × 107 J/kg, at what rate must coal be burned if the plant is to put out 1100 MW of power? Assume the efficiency of the engines is 60% of the ideal (Carnot) efficiency.” is broken down into a number of easy to follow steps, and 84 words. Since the solution to 28P from 15 chapter was answered, more than 478 students have viewed the full step-by-step answer. Physics: Principles with Applications was written by and is associated to the ISBN: 9780130606204.

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