Oncology & Cancer

PSA testing rates up in the U.S. after change in guidance

(HealthDay)—Rates of prostate-specific antigen (PSA) testing increased significantly after the 2017 U.S. Preventive Services Task Force (USPSTF) draft statement on prostate cancer screening, reversing trends that resulted ...

Diseases, Conditions, Syndromes

Putin tests experimental nasal vaccine against COVID-19

Russian President Vladimir Putin said Wednesday he has taken an experimental nasal vaccine against the coronavirus, three days after he received his booster shot, as Russia faces its worst surge of infections and deaths since ...

Diseases, Conditions, Syndromes

COVID-19 deaths in Russia hit record for 2nd straight day

Coronavirus deaths in Russia hit record highs for the second straight day Thursday, while new daily cases appeared to be taking a downward trend but still remained higher than during previous waves of the pandemic.

Diseases, Conditions, Syndromes

Russia's COVID-19 deaths set daily record

Russia is reporting a new daily high number of COVID-19 deaths, while the the total number of coronavirus infections during the pandemic in the country has topped 9 million.

Diseases, Conditions, Syndromes

Russia's COVID-19 deaths set daily record

Russia is reporting a new daily high number of COVID-19 deaths, while the the total number of coronavirus infections during the pandemic in the country has topped 9 million.

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Force

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