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I- O transistor NMOS possui este nome por conta das regiões de dreno (drain) e fonte (source) altamente dopadas com substrato tipo n.
ll- O terminal gate é eletricamente isolado do substrato por uma camada de dióxido de silício (SiO2).
III- Em um transistor NMOS, o canal induzido abaixo do gate tem origem na inversão da superfície do substrato do tipo n para o tipo p, e também é conhecido como camada de inversão.
IV- O substrato forma junções p-n com a região do dreno e da fonte que, em operação normal, devem ser mantidas reversamente polarizadas.
V. O transistores MOSFET são dispositivos simétricos, logo, é possível intercambiar a fonte (source) e dreno (drain) sem alterar as características do dispositivo.
Calcule o limite abaixo e assinale a opção correta.
Calcule a integral definida abaixo e assinale a opção correta.
O peso D de 2000 N e o contrapeso CG de 3000 N estão ligados a um motor elétrico M, como apresenta a figura acima. Determine a potência aproximada desenvolvida pelo motor M quando D está subindo com velocidade constante de 2,5 m/s e assinale a opção correta.
Um guindaste fixo tem massa igual a 1500 kg e é usado para levantar uma caixa de 2400 kg, como apresenta a figura acima. Ele é mantido no lugar por um pino articulado em A e um apoio simples em B. O centro de gravidade do guindaste é o ponto G. Assim, de acordo com os dados apresentados, determine a componente da reação em B e assinale a opção correta.
Dado:
g = 10 m/s2
Cargo ship carrying Porsches and Bentleys is burning and adrift at sea
À fire_________ Wednesday morning on the Felicity Ace, a ship about 650 feet long, near Portugal's Azores Islands, according to the Portuguese navy. The ship had departed from Emden, Germany, on Feb. 10 and was scheduled to arrive in Davisville, R.l., next week, according to a ship tracking website.
(Adapted from https://Awww.washingtonpost.com/)
Norwegian explorer and writer Thor Heyerdahl had attempted to prove that the Polynesian islands could have been colonized______ people ______South America______ pre-Colombian times,
(Adapted from<https://www.deeperblue.com/fantastic-voyages-myth-legend-and-the-recreation-of-ancient-boats> )
The Portuguese navy_______ all 22 crew members via helicopter. Authorities _________the rescue mission as “highly skilled and physically demanding.” The crew members______ to a hotel on Faial Island in the Azores. Nobody_______ in the fire.
(Adapted from https:/Avww.washingtonpost.com/)
(Adapted from https:/Awww.historyhit.com/undiscovered-shipwrecks)
Read the text below and answer the question.
COVID Airborne Transmission v. Monkeypox: Key Differences between viruses
By Aristos Georgiou
More than 1,000 cases of monkeypox have been confirmed around the world in several countries where the disease is not usually found - including the United States - raising questions about how the virus is spreading. But can monkeypox, a rare disease that is usually restricted to parts of Central and West Africa, spread via airborne transmission like the SARS-CoV-2 virus?
Some infectious diseases can spread through airborne transmission via tiny respiratory droplets known as aerosols that can become suspended in the air. These droplets are produced when an individual exhales, sneezes, coughs, talks, or sings, for example. These droplets can contain live viruses or other pathogens that can potentially infect healthy people if they land in the eyes, nose or mouth.
Airborne transmission does not require face-toface contact, and, in fact, an infected person does not even have to be in the same room as another individual to infect them because the droplets can linger in the air for some time,
Several diseases spread through airborne transmission, including measles and chickenpox. Others, meanwhile, can spread via larger respiratory droplets that do not float in the air as easily and fall to the ground faster.
SARS-CoV-2' spreads through exposure to respiratory fluids containirig the infectious virus, and, while it was not clear if the early stages of the: "CÓVID-19 pandemic, we now kriow that this can include âerosols. poa tt
(Adapted from https://www.neiuswesk com)
Read the text below and answer the question.
COVID Airborne Transmission v. Monkeypox: Key Differences between viruses
By Aristos Georgiou
More than 1,000 cases of monkeypox have been confirmed around the world in several countries where the disease is not usually found - including the United States - raising questions about how the virus is spreading. But can monkeypox, a rare disease that is usually restricted to parts of Central and West Africa, spread via airborne transmission like the SARS-CoV-2 virus?
Some infectious diseases can spread through airborne transmission via tiny respiratory droplets known as aerosols that can become suspended in the air. These droplets are produced when an individual exhales, sneezes, coughs, talks, or sings, for example. These droplets can contain live viruses or other pathogens that can potentially infect healthy people if they land in the eyes, nose or mouth.
Airborne transmission does not require face-toface contact, and, in fact, an infected person does not even have to be in the same room as another individual to infect them because the droplets can linger in the air for some time,
Several diseases spread through airborne transmission, including measles and chickenpox. Others, meanwhile, can spread via larger respiratory droplets that do not float in the air as easily and fall to the ground faster.
SARS-CoV-2' spreads through exposure to respiratory fluids containirig the infectious virus, and, while it was not clear if the early stages of the: "CÓVID-19 pandemic, we now kriow that this can include âerosols. poa tt
(Adapted from https://www.neiuswesk com)
Read the text below and answer the question..
Unmanned Vessel Plans Need Improvement, Agency Says
By Geoff Ziezulewicz
While the U.S. Navy is steaming full speed ahead in developing unmanned surface and undersea drones to augment the fleet of the future, the information technology and the artificial intelligence that will drive these platforms remain a work in progress. The sea service needs to better map out its efforts, according to a recent government watchdog report.
Navy shipbuilding plans call for spending more than $4 billion on such drones over the next five years, but that plan “does not account for the full costs to develop and operate these systems,” a Government Accountability Office report found.
Replacing crews requires IT and Al capabilities that the Navy has just begun to examine.
GAO's audit, which began in October 2020, found that the Navy is “only beginning to assess (unmanned systems”) effects on existing shipbuilding plans.”
“While the Navy has outlined a plan to spend $4.3 billion on uncrewed maritime systems in its shipbuilding plan, we found that this understates the costs associated with these systems because it does not account for all costs - specifically operations and sustainment, and the digital infrastructure necessary to enable them," the report states.
Funding unmanned development could also come under pressure from competing shipbuilding demands. The report found that the Navy has yet to stand up criteria for evaluating prototypes or developing better schedules for such prototype efforts.
The Navy is looking to introduce several unmanned systems into the fleet in the coming decades, according to GAO, and while some software will be unique to each platform, the Navy also wants to have a lot of common digital infrastructure among these vehicles.
This digital infrastructure would involve Al capabilities built over time to better help the platforms communicate, sense their surroundings and manage reams of data, the report states.
Navy officials told GAO that the sea service needs a host of technologies, including simulation software, software for autonomy and mission planning, large datasets for machine learning, as well as commercial tech and software that can be quickly bought and melded into Navy systems.
Among its recommendations, the report states that the Navy should provide Congress with a cost estimate for the full scope of work that will be required to make unmanned systems part of the fleet, while developing an approach to refine this estimate in the next shipbuilding plan.
The service should also establish an “uncrewed maritime systems portfolio” and offer more detail about how it intends to reach its unmanned objectives.
(Adapted from Navy Times. May 2022, p. 15.https://www .navytimes.com/)
Read the text below and answer the question..
Unmanned Vessel Plans Need Improvement, Agency Says
By Geoff Ziezulewicz
While the U.S. Navy is steaming full speed ahead in developing unmanned surface and undersea drones to augment the fleet of the future, the information technology and the artificial intelligence that will drive these platforms remain a work in progress. The sea service needs to better map out its efforts, according to a recent government watchdog report.
Navy shipbuilding plans call for spending more than $4 billion on such drones over the next five years, but that plan “does not account for the full costs to develop and operate these systems,” a Government Accountability Office report found.
Replacing crews requires IT and Al capabilities that the Navy has just begun to examine.
GAO's audit, which began in October 2020, found that the Navy is “only beginning to assess (unmanned systems”) effects on existing shipbuilding plans.”
“While the Navy has outlined a plan to spend $4.3 billion on uncrewed maritime systems in its shipbuilding plan, we found that this understates the costs associated with these systems because it does not account for all costs - specifically operations and sustainment, and the digital infrastructure necessary to enable them," the report states.
Funding unmanned development could also come under pressure from competing shipbuilding demands. The report found that the Navy has yet to stand up criteria for evaluating prototypes or developing better schedules for such prototype efforts.
The Navy is looking to introduce several unmanned systems into the fleet in the coming decades, according to GAO, and while some software will be unique to each platform, the Navy also wants to have a lot of common digital infrastructure among these vehicles.
This digital infrastructure would involve Al capabilities built over time to better help the platforms communicate, sense their surroundings and manage reams of data, the report states.
Navy officials told GAO that the sea service needs a host of technologies, including simulation software, software for autonomy and mission planning, large datasets for machine learning, as well as commercial tech and software that can be quickly bought and melded into Navy systems.
Among its recommendations, the report states that the Navy should provide Congress with a cost estimate for the full scope of work that will be required to make unmanned systems part of the fleet, while developing an approach to refine this estimate in the next shipbuilding plan.
The service should also establish an “uncrewed maritime systems portfolio” and offer more detail about how it intends to reach its unmanned objectives.
(Adapted from Navy Times. May 2022, p. 15.https://www .navytimes.com/)
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