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No Brasil, desde 2005, de acordo com a NORMAM-08/DPC, o Capitão dos Portos pode fazer uso do guia “Approach Channels – A Guide to Design”, da PIANC, para definir padrões de segurança em portos de juridição nacional. Dada a importância da geometria do navio relativa a geometria do canal, qual foi o valor limite aceitável de ângulo de leme empregado pelo Professor Haruzo Eda, para fins de segurança e viabilidade de controle, através do Prático e Comandante, para se manter um navio em linha reta, quando se aproximando de uma margem em um canal de acesso, de acordo com o “Príncipios de Arquitetura Naval”?
I) The flow of water around the bottom of the hull is restricted in shallow water, therefore the water flowing under the hull speeds up.
II) The faster moving water decreases the pressure under the hull, causing the ship to “squat”, increasing wetted surface area and increasing frictional resistance.
III) The waves produced in shallow water tend to be longer than do waves produced in deep water at the same speed.
IV) The energy required to produce ship’s waves in shallow water is the same to deep water at the same speed.
Following “Principles of Naval Architecture” what is the correct alternative?
I) The momentum theory is used to describe the action of an “ideal” propeller. The propeller it self is assumed to be a “disc”.
II) The propeller causes uniform increase in pressure as the fluid passes through the disc coupled with uniform increase in fluid velocity.
III) The exact nature of the propeller (pitch, number of blades, shaft rpm, etc) is not important.
IV) There is an unlimited inflow of water to the propeller and the flow is not frictionless.
From theory of “Principles of Naval Architecture”, mark the correct alternative: