Can mechanical energy vanish into thin air?

Can mechanical energy vanish into thin air? NOTES AND DISCUSSIONS Joaquın Moreno Department of Biochemistry and Molecular Biology, Institute of Integrative and Systems Biology, University of Valencia, c/ Dr. Moliner 50, Burjassot (Valencia) E-46100, Spain (Received 19 April 2017; accepted 9 December 2017) https://doi.org/10.1119/1.5019022 excess heat must match exactly the elastic energy of the I. INTRODUCTION spring, so that total energy is conserved. In 1845, James Prescott Joule published his celebrated To understand this we should realize that disturbing a metal experiment that established the mechanical equivalent of spring from its relaxed position—by shortening or extending heat. He connected the falling of a weight to the rotation of it—means to force interatomic distance out of its potential paddles inside a water container, and measured the increase energy minimum (Fig. 1). Thus, the work done at compress- of temperature of the stirred water. Thereby he found a direct ing the spring is stored at the atomic level as increased poten- relation between the loss of potential energy by the descend- tial energy of the metallic bonds. Because the heat released in ing weight and the heat transferred to the water. This result a chemical reaction is just the difference between products encouraged the contemplation of heat as http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The American Journal of Physics American Association of Physics Teachers

Can mechanical energy vanish into thin air?

Loading next page...
 
/lp/aapt/can-mechanical-energy-vanish-into-thin-air-DqyN7Mi9sh
Publisher
American Association of Physics Teachers
Copyright
© 2018 American Association of Physics Teachers.
ISSN
0002-9505
D.O.I.
10.1119/1.5019022
Publisher site
See Article on Publisher Site

Abstract

NOTES AND DISCUSSIONS Joaquın Moreno Department of Biochemistry and Molecular Biology, Institute of Integrative and Systems Biology, University of Valencia, c/ Dr. Moliner 50, Burjassot (Valencia) E-46100, Spain (Received 19 April 2017; accepted 9 December 2017) https://doi.org/10.1119/1.5019022 excess heat must match exactly the elastic energy of the I. INTRODUCTION spring, so that total energy is conserved. In 1845, James Prescott Joule published his celebrated To understand this we should realize that disturbing a metal experiment that established the mechanical equivalent of spring from its relaxed position—by shortening or extending heat. He connected the falling of a weight to the rotation of it—means to force interatomic distance out of its potential paddles inside a water container, and measured the increase energy minimum (Fig. 1). Thus, the work done at compress- of temperature of the stirred water. Thereby he found a direct ing the spring is stored at the atomic level as increased poten- relation between the loss of potential energy by the descend- tial energy of the metallic bonds. Because the heat released in ing weight and the heat transferred to the water. This result a chemical reaction is just the difference between products encouraged the contemplation of heat as

Journal

The American Journal of PhysicsAmerican Association of Physics Teachers

Published: Mar 19, 2018

There are no references for this article.

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Search

Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly

Organize

Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.

Access

Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve

Freelancer

DeepDyve

Pro

Price

FREE

$49/month
$360/year

Save searches from
Google Scholar,
PubMed

Create lists to
organize your research

Export lists, citations

Read DeepDyve articles

Abstract access only

Unlimited access to over
18 million full-text articles

Print

20 pages / month

PDF Discount

20% off