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Bài viết của Lê Thị Khánh Huyền

The First Law of Thermodynamics

This boiling tea kettle represents energy in motion. The water in the kettle is turning to water vapor because heat is being transferred from the stove to the kettle. As the entire system gets hotter, work is done—from the ...

Tác giả: Lê Thị Khánh Huyền viết 15:04 ngày 25/05/2018 chỉnh sửa

Animal Form and Function

Animals vary in form and function. From a sponge to a worm to a goat, an organism has a distinct body plan that limits its size and shape. Animals’ bodies are also designed to interact with their environments, whether in the deep sea, a rainforest canopy, ...

Tác giả: Lê Thị Khánh Huyền viết 15:04 ngày 25/05/2018 chỉnh sửa

Probability: The Heisenberg Uncertainty Principle

Matter and photons are waves, implying they are spread out over some distance. What is the position of a particle, such as an electron? Is it at the center of the wave? The answer lies in how you measure the position of an electron. ...

Tác giả: Lê Thị Khánh Huyền viết 15:03 ngày 25/05/2018 chỉnh sửa

Overview of the Digestive System

The function of the digestive system is to break down the foods you eat, release their nutrients, and absorb those nutrients into the body. Although the small intestine is the workhorse of the system, where the majority of digestion occurs, and where most of ...

Tác giả: Lê Thị Khánh Huyền viết 15:03 ngày 25/05/2018 chỉnh sửa

Amphibians

are vertebrate tetrapods. Amphibia includes frogs, salamanders, and caecilians. The term amphibian loosely translates from the Greek as “dual life,” which is a reference to the metamorphosis that many frogs and salamanders undergo and their ...

Tác giả: Lê Thị Khánh Huyền viết 15:03 ngày 25/05/2018 chỉnh sửa

Prokaryotic Diversity

Prokaryotes are present everywhere. They cover every imaginable surface where there is sufficient moisture, and they live on and inside of other living things. There are more prokaryotes inside and on the exterior of the human body than there are human cells in ...

Tác giả: Lê Thị Khánh Huyền viết 15:02 ngày 25/05/2018 chỉnh sửa

How Cells Are Studied

A cell is the smallest unit of a living thing. A living thing, like you, is called an organism. Thus, cells are the basic building blocks of all organisms. In multicellular organisms, several cells of one particular kind interconnect with each other and ...

Tác giả: Lê Thị Khánh Huyền viết 15:02 ngày 25/05/2018 chỉnh sửa

Null Measurements

Standard measurements of voltage and current alter the circuit being measured, introducing uncertainties in the measurements. Voltmeters draw some extra current, whereas ammeters reduce current flow. Null measurements balance voltages so that there is no ...

Tác giả: Lê Thị Khánh Huyền viết 15:02 ngày 25/05/2018 chỉnh sửa

Newton’s Universal Law of Gravitation

What do aching feet, a falling apple, and the orbit of the Moon have in common? Each is caused by the gravitational force. Our feet are strained by supporting our weight—the force of Earth’s gravity on us. An apple falls from a tree because of the ...

Tác giả: Lê Thị Khánh Huyền viết 15:02 ngày 25/05/2018 chỉnh sửa

Regulation of Hormone Production

Hormone production and release are primarily controlled by negative feedback. In negative feedback systems, a stimulus elicits the release of a substance; once the substance reaches a certain level, it sends a signal that stops further release of the substance. ...

Tác giả: Lê Thị Khánh Huyền viết 15:02 ngày 25/05/2018 chỉnh sửa

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The First Law of Thermodynamics

Animal Form and Function

Probability: The Heisenberg Uncertainty Principle

Overview of the Digestive System

Amphibians

Prokaryotic Diversity

How Cells Are Studied

Null Measurements

Newton’s Universal Law of Gravitation

Regulation of Hormone Production

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