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Bài viết của Lê Thị Khánh Huyền

Homeostasis

Animal organs and organ systems constantly adjust to internal and external changes through a process called homeostasis (“steady state”). These changes might be in the level of glucose or calcium in blood or in external temperatures. means to ...

Tác giả: Lê Thị Khánh Huyền viết 14:55 ngày 25/05/2018 chỉnh sửa

Power and Authority

The White House, one of the world’s most widely recognized state buildings, symbolizes the authority of the U.S. presidency. (Courtesy U.S. National Archives/Wikimedia Commons) From the ...

Tác giả: Lê Thị Khánh Huyền viết 14:55 ngày 25/05/2018 chỉnh sửa

Work: The Scientific Definition

The scientific definition of work differs in some ways from its everyday meaning. Certain things we think of as hard work, such as writing an exam or carrying a heavy load on level ground, are not work as defined by a scientist. The scientific ...

Tác giả: Lê Thị Khánh Huyền viết 14:55 ngày 25/05/2018 chỉnh sửa

Centripetal Acceleration

We know from kinematics that acceleration is a change in velocity, either in its magnitude or in its direction, or both. In uniform circular motion, the direction of the velocity changes constantly, so there is always an associated acceleration, even though ...

Tác giả: Lê Thị Khánh Huyền viết 14:55 ngày 25/05/2018 chỉnh sửa

Conductors and Insulators

This power adapter uses metal wires and connectors to conduct electricity from the wall socket to a laptop computer. The conducting wires allow electrons to move freely through the cables, which are shielded by rubber and plastic. These ...

Tác giả: Lê Thị Khánh Huyền viết 14:55 ngày 25/05/2018 chỉnh sửa

Anatomy of Selected Synovial Joints

Each synovial joint of the body is specialized to perform certain movements. The movements that are allowed are determined by the structural classification for each joint. For example, a multiaxial ball-and-socket joint has much more mobility than a uniaxial ...

Tác giả: Lê Thị Khánh Huyền viết 14:55 ngày 25/05/2018 chỉnh sửa

Microscopes

Although the eye is marvelous in its ability to see objects large and small, it obviously has limitations to the smallest details it can detect. Human desire to see beyond what is possible with the naked eye led to the use of optical instruments. In this ...

Tác giả: Lê Thị Khánh Huyền viết 14:54 ngày 25/05/2018 chỉnh sửa

Cohesion and Adhesion in Liquids: Surface Tension and Capillary Action

Children blow soap bubbles and play in the spray of a sprinkler on a hot summer day. (See [link].) An underwater spider keeps his air supply in a shiny bubble he carries wrapped around him. A technician draws blood into a small-diameter tube just ...

Tác giả: Lê Thị Khánh Huyền viết 14:54 ngày 25/05/2018 chỉnh sửa

Dispersion: The Rainbow and Prisms

Everyone enjoys the spectacle of a rainbow glimmering against a dark stormy sky. How does sunlight falling on clear drops of rain get broken into the rainbow of colors we see? The same process causes white light to be broken into colors by a clear glass ...

Tác giả: Lê Thị Khánh Huyền viết 14:54 ngày 25/05/2018 chỉnh sửa

Sexual Reproduction

Sexual reproduction was an early evolutionary innovation after the appearance of eukaryotic cells. It appears to have been very successful because most eukaryotes are able to reproduce sexually, and in many animals, it is the only mode of reproduction. And yet, ...

Tác giả: Lê Thị Khánh Huyền viết 14:54 ngày 25/05/2018 chỉnh sửa

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Homeostasis

Power and Authority

Work: The Scientific Definition

Centripetal Acceleration

Conductors and Insulators

Anatomy of Selected Synovial Joints

Microscopes

Cohesion and Adhesion in Liquids: Surface Tension and Capillary Action

Dispersion: The Rainbow and Prisms

Sexual Reproduction

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