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Bài viết của Lê Thị Khánh Huyền

Electric Generators

Electric generators induce an emf by rotating a coil in a magnetic field, as briefly discussed in Induced Emf and Magnetic Flux. We will now explore generators in more detail. Consider the following example. Calculating the Emf Induced in a ...

Tác giả: Lê Thị Khánh Huyền viết 15:19 ngày 25/05/2018 chỉnh sửa

Issues in Education

As schools strive to fill a variety of roles in their students’ lives, many issues and challenges arise. Students walk a minefield of bullying, violence in schools, the results of declining funding, plus other problems that affect ...

Tác giả: Lê Thị Khánh Huyền viết 15:19 ngày 25/05/2018 chỉnh sửa

Heart Anatomy

The vital importance of the heart is obvious. If one assumes an average rate of contraction of 75 contractions per minute, a human heart would contract approximately 108,000 times in one day, more than 39 million times in one year, and nearly 3 billion times ...

Tác giả: Lê Thị Khánh Huyền viết 15:19 ngày 25/05/2018 chỉnh sửa

Temperature Change and Heat Capacity

One of the major effects of heat transfer is temperature change: heating increases the temperature while cooling decreases it. We assume that there is no phase change and that no work is done on or by the system. Experiments show that the transferred heat ...

Tác giả: Lê Thị Khánh Huyền viết 15:18 ngày 25/05/2018 chỉnh sửa

Transformers

do what their name implies—they transform voltages from one value to another (The term voltage is used rather than emf, because transformers have internal resistance). For example, many cell phones, laptops, video games, and power tools and small ...

Tác giả: Lê Thị Khánh Huyền viết 15:18 ngày 25/05/2018 chỉnh sửa

Sex and Sexuality

Sexual practices can differ greatly among groups. Recent trends include the finding that married couples have sex more frequently than do singles and that 27 percent of married couples in their 30s have sex at least twice a week ...

Tác giả: Lê Thị Khánh Huyền viết 15:18 ngày 25/05/2018 chỉnh sửa

The Skull

The cranium (skull) is the skeletal structure of the head that supports the face and protects the brain. It is subdivided into the facial bones and the brain case , or cranial vault ([link]). The facial bones underlie the facial structures, form the nasal ...

Tác giả: Lê Thị Khánh Huyền viết 15:18 ngày 25/05/2018 chỉnh sửa

Deviance and Control

Much of the appeal of watching entertainers perform in drag comes from the humor inherent in seeing everyday norms violated. (Photo courtesy of Cassiopeija/Wikimedia Commons) What, exactly, is deviance? And what is the ...

Tác giả: Lê Thị Khánh Huyền viết 15:18 ngày 25/05/2018 chỉnh sửa

Graphical Analysis of One-Dimensional Motion

A graph, like a picture, is worth a thousand words. Graphs not only contain numerical information; they also reveal relationships between physical quantities. This section uses graphs of displacement, velocity, and acceleration versus time to illustrate ...

Tác giả: Lê Thị Khánh Huyền viết 15:18 ngày 25/05/2018 chỉnh sửa

Physical Quantities and Units

The distance from Earth to the Moon may seem immense, but it is just a tiny fraction of the distances from Earth to other celestial bodies. (credit: NASA) The range of objects and phenomena studied in physics is immense. From the ...

Tác giả: Lê Thị Khánh Huyền viết 15:17 ngày 25/05/2018 chỉnh sửa

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Electric Generators

Issues in Education

Heart Anatomy

Temperature Change and Heat Capacity

Transformers

Sex and Sexuality

The Skull

Deviance and Control

Graphical Analysis of One-Dimensional Motion

Physical Quantities and Units

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