Engineering
Southwest Research Institute engineers are advancing what researchers know about hypersonic flight. A new study presented at the 2019 Joint Army-Navy-NASA-Air Force (JANNAF) Propulsion Meeting describes a series of tests ...
Oct 8, 2019
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Computer Sciences
German investigators said Friday they have shut down a data processing center installed in a former NATO bunker that hosted sites dealing in drugs and other illegal activities. Seven people were arrested.
Sep 27, 2019
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Consumer & Gadgets
Ring, the company best known for its video doorbells, is unveiling its lowest-priced and first indoor security camera, Ring Indoor Cam, for $59.99.
Sep 26, 2019
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Sailing used to be considered as a rather sedate pastime. But in the past few years, the world of yacht racing has been revolutionised by the arrival of hydrofoil-supported catamarans, known as "foilers". These vessels, more ...
Sep 19, 2019
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Engineering
Automation is not likely to eliminate millions of jobs any time soon—but the U.S. still needs vastly improved policies if Americans are to build better careers and share prosperity as technological changes occur, according ...
Sep 5, 2019
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Consumer & Gadgets
Facial recognition technology is spreading fast. Already widespread in China, software that identifies people by comparing images of their faces against a database of records is now being adopted across much of the rest of ...
Aug 22, 2019
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Engineering
The 60th Maintenance Squadron is the first field unit in the U.S. Air Force to be certified with an industrial-sized, 3-D printer that is authorized to produce nonstructural aircraft parts.
Aug 21, 2019
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Security
It was bound to happen, and it did. Poorly crafted legislation – designed to allow national security agencies to collect information with the aim of protecting Australians from terrorists—is now reportedly being exploited ...
Aug 5, 2019
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Business
The grounding of the 737 MAX for more than four months after two deadly accidents has tarnished Boeing's reputation, but it still has the confidence of US policymakers.
Aug 4, 2019
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Robotics
We have robots that can walk, see, talk and hear, and manipulate objects in their robotic hands. There's even a robot that can smell.
Jul 15, 2019
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In physics, a force is any influence that causes an object to undergo a change in speed, a change in direction, or a change in shape. In other words, a force is that which can cause an object with mass to change its velocity (which includes to begin moving from a state of rest), i.e., to accelerate, or which can cause a flexible object to deform. Force can also be described by intuitive concepts such as a push or pull. A force has both magnitude and direction, making it a vector quantity. Newton's second law, F=ma, was originally formulated in slightly different, but equivalent terms: the original version states that the net force acting upon an object is equal to the rate at which its momentum changes.
Related concepts to force include: thrust, which increases the velocity of an object; drag, which decreases the velocity of an object; and torque which produces changes in rotational speed of an object. Forces which do not act uniformly on all parts of a body will also cause mechanical stresses, a technical term for influences which cause deformation of matter. While mechanical stress can remain embedded in a solid object, gradually deforming it, mechanical stress in a fluid determines changes in its pressure and volume.
This text uses material from Wikipedia, licensed under CC BY-SA
