Foram encontradas 50 questões.
Read text I. Answer question below based on text I.
Text I - The enduring appeal of Aviator sunglasses
By Katya Foreman
8 July 2015
Sometimes a name becomes so well-known we forget its original meaning. A case in point is Ray-Ban, which was behind the world's first aviator sunglasses, conceived in the 1930s to ban rays from the eyes of US Air Force pilots. Though marketed under the Ray-Ban banner, it was the parent company brand, Bausch & Lomb - a US firm specialising in eye health products that came up with the invention, Developed as an alternative to the fur-lined goggles worn by pilots in the early 20th-Century - which definitely didn't perform technically - aviator sunglasses became the perfect solution to protect a pilot's eyes against the elements, help to avoid headaches and to combat decreased visibility caused by the blinding glare of the sun at high altitude.
The aviator was not to remain confined to the cockpit, however. Fitted with green lenses that could cut out the glare without obscuring vision, the first examples, which went on sale to the public in 1937, featured a plastic frame in the now-classic teardrop shape (echoing the form of pilot's goggles), but was remodelled with a metal frame the following year and rebranded as the Ray-Ban Aviator.
Adapted from <http://www.bbc.com/culture/story/20150708-the-enduring-
appeal- of-aviator-sunglasses>
“The aviator was not to remain confined to the cockpit, however.” What does the underlined term express in the text?
Provas
Sejam X e Y matrizes do tipo n x n, assinale a opção INCORRETA.
Provas
Seja \( \vec F \) um campo vetorial do R3 definido por \( \vec F = xz^2 \vec i + z^4 \vec j + yz\vec k \) e seja S a superfície \( x^2 + y^2 + z^2 = 4 \), com \( \sqrt 2 \le z \le \sqrt3 \), e o vetor normal \( \vec n \) apontado para cima, assinale a opção que apresenta o valor do fluxo do rotacional de \( \vec F \) sobre S.
Provas
Seja \( f \) uma função real definida por \( f(x) = xln(x) \), com \( x ∈ (0, \infty) \), determine o valor de \( A = \begin{vmatrix} 1 & -2 \\ 1 & d \end{vmatrix} \),onde \( d = \int^1_0 f(x) dx \), e assinale a opção correta.
Provas
Seja a matriz \( A = \begin{bmatrix} 1 & b & 3 \\ 2 & 7 & 4 \\ g & h & 5 \end{bmatrix} \). Se \( A = A' \), então:
Provas
Seja \( f \) uma função real definida por \( f(x) = \begin{cases} ax^2 + b, se \ x \le 1 \\ { \large 1 \over |x|}, se \ x >1 \end{cases} \), os valores de \( a \) e \( b \) são tais que fazem com que \( f'(1) \) exista. É correto afirmar que \( b \) excede \( a \) em quantas unidades?
Provas
Determine a solução do sistema linear abaixo e assinale a opção correta.
\( \begin{cases} 3x + y + z = 2 \\ \ y + 2z = 4 \\ 2x + 3y + 4z = 8 \end{cases} \)
Provas
Analise as afirmativas abaixo.
I - Seja \( V \) um espaço vetorial com produto interno. Se \( \vec u \), \( \vec v ∈ V \) existe pelo menos um vetor \( \vec v ∈ V \) que faz com que \( < \vec w, \vec m > \ne 0 \), em que \( \vec w = |\vec u| \vec v + |\vec v| \vec u \) e \( \vec m = |\vec u| \vec v - |\vec v| \vec u \).
II - O núcleo de toda transformação linear \( T: 5^5 \rightarrow R^3 \) tem dimensão maior ou igual a 3.
III - Se a transformação linear \( T : R^m \rightarrow R^n \) é injetiva então a dimensão da imagem de \( T \) é igual a \( m \).
IV - Se \( \lambda \) é um autovalor do operador invertível \( K \), então \( \lambda^{-1} \) é um autovalor de \( K^{-1} \).
Assinale a opção correta.
Provas
Which sequence best complete the blanks below?
The distress signal consist grave and imminent danger. The distress must be sent the authority of the person command. The Station in distress will insist repeating the distress message until an answer is received.
Provas
Read Text II . Answer the question.
Text II - Distress Message and Call
The distress call has absolute priority over all other transmissions. All stations that hear it will immediately cease any transmission capable of interfering with distress traffic and will continue to listen on the frequency used for distress call. The distress message will be repeated at intervals by the vessel in distress until an answer is received or until it is no longer feasible to continue. The intervals between repetitions of the distress message will be sufficiently long to allow time for stations, which have received the message, to reply.
Taken from Maritime and IMO SMCP 2001. Rijeka, 2003
What can be understood about the text?
Provas
Caderno Container