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The first handheld mobile phone was demonstrated by Martin Cooper of Motorola in New York City on 3 April 1973, using a handset weighing c. 2 kilograms (4.4 lbs). [2] In 1979, Nippon Telegraph and Telephone (NTT) launched the world's first cellular network in Japan. [3] In 1983, the DynaTAC 8000x was the first commercially available handheld ...
The triboelectric effect (also known as triboelectricity, triboelectric charging, triboelectrification, or tribocharging) describes electric charge transfer between two objects when they contact or slide against each other. It can occur with different materials, such as the sole of a shoe on a carpet, or between two pieces of the same material.
Adobe Acrobat 9.0 was released. Support for version 9 ended June 26, 2013, [10] with the last available update being 9.5.5. Adobe Acrobat 9.5.5 is the very last version, which can be installed on Unix-based system. Therefore 10 years after release Adobe Acrobat 9.5.5 is still used on modern and cutting-edge Systems.
Download attachments in AOL Mail. If you've received an attachment in your email you want to save, you can download the file right to your computer. Download all attachments in a single zip file, or download individual attachments. While this is often a seamless process, you should also be aware of how to troubleshoot common errors.
When charged particles move in electric and magnetic fields the following two laws apply: Lorentz force law: = (+),; Newton's second law of motion: = =; where F is the force applied to the ion, m is the mass of the particle, a is the acceleration, Q is the electric charge, E is the electric field, and v × B is the cross product of the ion's velocity and the magnetic flux density.
A California judge has temporarily blocked a hearing from taking place in a dispute between one of the state's most influential agricultural companies and the country's biggest farmworkers' union.
June 18, 2024 at 4:13 PM. Joseph Prezioso. The 911 emergency system was down statewide for over an hour in Massachusetts on Tuesday afternoon. State officials notified the public that the issue ...
Heat accumulates over time in people’s bodies, and the risk of a heart attack, heatstroke or other medical ailment often rises over time. Some experts said medical risks due to heat often trail ...