Classical and Modern Physics - download pdf or read online

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7). How сап we iпcrease its iпterпal eпergy ? Опе way is to heat the cyliпder. The warm iппеr side of the cyliпder transfers some energy to the air as mo]ecules in the air collide repeatedly with molecules in the glass surface. Th is is heat traпsfer. Aпother way is to move the pistoп i nward . The force required to move it multipl ied Ьу the distance it moves is work , and this work is transferred to the internal energy of the air. The tem­ peratu re of the air rises, just as i f it had Ьееп heated.

Units of Sec. 5 lntemal energy and heat universal concept сараЫе of changing its appearance drastically without ever changing its total magnitude. * Once they had unified the ideas of heat and mechanical energy, the greatest hurdle was surmounted. I t \Vas then easy to add electromagnetic energy and chem ical energy and eventually nuclear energy. The important thing \vas their proposal of а general law of energy conservation. If stirring а container of water with а paddle seems а childish pursuit for а grown man, consider its implicat ions.

Heat is often coпsidered yet aпother form of eпergy. То Ье more exact, it is а maп i festatioп of energy transfer Ьу m olecular collisions. If warm alcohol is added to cold water, the alcohol molecules l ose energy and the water mo]ecules gaiп eпergy. Eпergy has Ьееп traпsferred from alcohol to \Vater, апd the t ransfer has Ьееп e ffected Ьу а multitude of m olecular collisioпs. Heat, like work, is more а пате for ап eпergy curreпcy thaп а пате for а "real" eпergy. It is а mode of eпergy exchange.

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