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Kaufman, Richard – European Journal of Physics Education, 2019
The first law of thermodynamics does not forbid heat engines with 100% thermodynamic efficiency; it is the second law of thermodynamics which states that heat engines cannot obtain 100% efficiency. Can the first law ever show this second law result? Yes. We show that the first law alone can show that some heat engines cannot achieve efficiencies…
Descriptors: Thermodynamics, Scientific Principles, Heat, Efficiency
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Härtel, Hermann – European Journal of Physics Education, 2018
The well-known historical development of Electromagnetism, strongly influenced by the work of Faraday and Maxwell, has led to the introduction of the magnetic field as an important component to explain the diverse phenomena of electromagnetic induction. This historical development is compared in the form of a thought experiment with a possible…
Descriptors: Physics, Science Instruction, Scientific Concepts, Electronics
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Härtel, Hermann – European Journal of Physics Education, 2018
The classical physics treatment of "Electromagnetic Induction" is based on Faraday's Law and Lorentz Force. This paper presents an alternative approach, based on Wilhelm Weber´s Fundamental Force Law of Electrodynamics. It covers mutual induction, self-induction, parallel and anti-parallel currents, and currents in the same and opposite…
Descriptors: Energy, Scientific Concepts, Scientific Principles, Physics
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Kianian, Kiarash; Bozorgmehr, Aria – European Journal of Physics Education, 2017
In this paper, we indicate the difference between energy equation and the center of mass equation by an especially example. According to our opinion, in teaching mechanics, we should more clearly an integral of Newton's second law and the energy equation. Maybe this leads to greater clarity in the notions of system, work and energy.
Descriptors: Mechanics (Physics), Energy, Equations (Mathematics), Kinetics
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Ünlü Yavas, Pervin; Kizilcik, Hasan Sahin – European Journal of Physics Education, 2016
The aim of this study is to identify the reasons why pre-service physics teachers have difficulties related to special relativity topics. In this study conducted with 25 pre-service physics teachers, the case study method, which is a qualitative research method, was used. Interviews were held with the participants about their reasons for…
Descriptors: Preservice Teachers, Physics, Scientific Principles, Science Education
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Dean, Kevin; Mathew, Jyothi – European Journal of Physics Education, 2016
A theoretical analysis is presented, showing the derivations of seven different linearization equations for the conical pendulum period "T", as a function of radial and angular parameters. Experimental data obtained over a large range of fixed conical pendulum lengths (0.435 m-2.130 m) are plotted with the theoretical lines and…
Descriptors: Equations (Mathematics), Motion, Science Experiments, Physics