Engineering
In June, the American Society of Heating and Air-Conditioning Engineers (ASHRAE) approved Standard 241, which establishes minimum requirements for building owners, operators and professionals to improve indoor air quality ...
Aug 2, 2023
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39
Robotics
An elephant uses its trunk for eating, drinking water, communicating, exploring the environment, social behavior, and making and using tools. The trunk, which contains six muscle groups, is not only very strong—it can uproot ...
Jun 23, 2024
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10
Business
California filed a lawsuit Wednesday accusing Amazon of using its market influence to prevent merchants from offering buyers better deals elsewhere online, in violation of state antitrust law.
Sep 15, 2022
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5
Machine learning & AI
The United Nations and the Red Cross this week issued a joint call for urgent new international rules to protect humanity from the potential "terrible consequences" of autonomous weapons.
Oct 6, 2023
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1
Security
The State Department will offer rewards up to $10 million for information leading to the identification of anyone engaged in foreign state-sanctioned malicious cyber activity, including ransomware attacks, against critical ...
Jul 15, 2021
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2
Business
Japan's Softbank said Monday it will merge its Z Holdings unit—formerly called Yahoo Japan—with popular chat app Line in a multibillion-dollar deal it hopes will help it better compete against big guns in the digital ...
Nov 18, 2019
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3
Business
Amazon said Friday it paid more than $1 billion in US federal income taxes in 2019 as it pushed back at criticism over its corporate responsibility.
Jan 31, 2020
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0
Business
More than 1,600 Google workers are demanding the company "take real steps to help dismantle racism" and end its police contracts. In a letter that began circulating internally last week, workers wrote that they were "disappointed ...
Jun 23, 2020
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7
Business
After more than half a century, the last Boeing 747 rolled out of a Washington state factory on Tuesday.
Dec 6, 2022
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5
Business
Boeing is cutting more than 12,000 jobs through layoffs and buyouts as the coronavirus pandemic seizes the travel industry, and more cuts are coming.
May 27, 2020
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6
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
