1. importsource = "0031921x-2012-04.txt"
Se encontraron 74 resultados.
Artículo:

The Square Light Clock and Special Relativity

Autor:

J. Ronald Galli

Farhang Amiri

Resumen:

A thought experiment that includes a square light clock is similar to the traditional vertical light beam and mirror clock, except it is made up of four mirrors placed at a 45° angle at each corner of a square of length L0, shown in Fig. 1. Here we have shown the events as measured in the rest frame of the square light clock. By studying the same cycle of events measured in a frame of reference where the square light clock is in motion with speed of v, we can derive both time dilation and, independently, length contraction. This will be done by analyzing the changing dimensions and also the one-cycle timing for this square light clock.

Página:

212

Publicación:

The Physics Teacher

Volúmen:

50

Número:

4

Periodo:

abril 2012

ISSN:

0031921x

SrcID:

0031921x-2012-04.txt

  • Documento número 351333
  • Actualizado el martes, 23 de mayo de 2017 04:02:21 p. m.
  • Creado el martes, 23 de mayo de 2017 04:02:21 p. m.
  • Enlace directo
Artículo:

High School Physics Teaching Experience

Resumen:

We divided our high school physics teaching experience into three groups: first year teaching physics, second or third year teaching physics, and four or more years of experience teaching physics. We did this because everything is new for teachers teaching a course for the first time. The second and third time through the course, teachers learn from past experiences and hone their approaches. By the time a teacher is in the fourth year of teaching a course, he or she is more comfortable with the material and better able to understand the ways in which different approaches work with different topics.

Página:

214

Publicación:

The Physics Teacher

Volúmen:

50

Número:

4

Periodo:

abril 2012

ISSN:

0031921x

SrcID:

0031921x-2012-04.txt

  • Documento número 351334
  • Actualizado el martes, 23 de mayo de 2017 04:02:21 p. m.
  • Creado el martes, 23 de mayo de 2017 04:02:21 p. m.
  • Enlace directo
Artículo:

Removing the Mystery of Entropy and Thermodynamics — Part IV

Autor:

Harvey S. Leff

Página:

215

Publicación:

The Physics Teacher

Volúmen:

50

Número:

4

Periodo:

abril 2012

ISSN:

0031921x

SrcID:

0031921x-2012-04.txt

  • Documento número 351335
  • Actualizado el martes, 23 de mayo de 2017 04:02:21 p. m.
  • Creado el martes, 23 de mayo de 2017 04:02:21 p. m.
  • Enlace directo
Artículo:

The Physics of Shot Towers

Autor:

Trevor C. Lipscombe

Carl E. Mungan

Resumen:

In the late 18th and throughout the 19th century, lead shot for muskets was prepared by use of a shot tower. Molten lead was poured from the top of a tower and, during its fall, the drops became spherical under the action of surface tension. In this article, we ask and answer the question: How does the size of the lead shot depend on the height of the tower? In the process, we explain the basic technology underlying an important historical invention (the shot tower) and use simple physics (Newtonian mechanics and the thermodynamic laws of cooling) to model its operation.

Página:

218

Publicación:

The Physics Teacher

Volúmen:

50

Número:

4

Periodo:

abril 2012

ISSN:

0031921x

SrcID:

0031921x-2012-04.txt

  • Documento número 351336
  • Actualizado el martes, 23 de mayo de 2017 04:02:21 p. m.
  • Creado el martes, 23 de mayo de 2017 04:02:21 p. m.
  • Enlace directo
Artículo:

A Flush Toilet Model for the Transistor

Autor:

Giovanni Organtini

Resumen:

In introductory physics textbooks, diodes working principles are usually well described in a relatively simple manner. According to our experience, they are well understood by students. Even when no formal derivation of the physics laws governing the current flow through a diode is given, the use of this device as a check valve is easily accepted. This is not true for transistors. In most textbooks the behavior of a transistor is given without formal explanation. When the amplification is computed, for some reason, students have difficulties in identifying the basic physical mechanisms that give rise to such an effect. In this paper we give a simple and captivating illustration of the working principles of a transistor as an amplifier, tailored to high school students even with almost no background in electronics nor in modern physics. We assume that the target audience is familiar with the idea that a diode works as a check valve for currents. The lecture emphasis is on the illustration of physics principles governing the behavior of a transistor, rather than on a formal description of the processes leading to amplification.

Página:

221

Publicación:

The Physics Teacher

Volúmen:

50

Número:

4

Periodo:

abril 2012

ISSN:

0031921x

SrcID:

0031921x-2012-04.txt

  • Documento número 351337
  • Actualizado el martes, 23 de mayo de 2017 04:02:21 p. m.
  • Creado el martes, 23 de mayo de 2017 04:02:21 p. m.
  • Enlace directo