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Вопрос по математике:
В случайном эксперименте бросают две игральные кости . Найдите вероятность того, что в сумме.выпадет 2 очка. Результаты округлите до сотых.-
Автор:
bentley98
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В игральной кости шесть граней, на них очки 1;2;3;4;5;6. Число всевозможных подбрасывания двух игральный костей равно 6*6=36 из них благоприятных 1 (это выпадение очков {1;1}).
Искомая вероятность: P = 1/36 ≈ 0.03
Еще 4 ненужных тебе вопроса, но это важно для поиска
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Вопрос по физике:
напряженность поля в точке равна 300 H/Кл.Если заряд равен 1*10-8 Кл.то расстояние до точки-
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Вопрос по математике:
Помогите решить задачу по теореме умножения вероятностей 11 класс
формулы: P(AB)=P(A)* P(B/A)=P(B)*P(A/B)
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Вопрос по математике:
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Вопрос по английскому языку:
СРОЧНО НУЖНА ПОМОЩЬ ДАЮ ВСЕ БАЛЛЫ ЧТО ЕСТЬ
Напишите 5 вопросов к предложению из текста (общий, специальный, альтернативный, разделительный, вопрос к подлежащему).
Welding is a process when metal parts are joined together by the application of heat, pressure, or a combination of both. The processed of welding can be divided into two main groups: pressure welding, when the weld is achieved by pressure and heat welding, when the weld is achieved by heat. Heat welding is the most common welding process used today.
Nowadays welding is used instead of bolting and riveting in the construction of many types of structures, including bridges, buildings, and ships. It is also a basic process in the manufacture of machinery and in the motor and aircraft industries. It is necessary almost in all productions where metals are used.
The welding process depends greatly on the properties of the metals, the purpose of their application and the available equipment. Welding processes are classified according to the sources of heat and pressure used.
The welding processes widely employed today include gas welding, arc welding, and resistance welding. Other joining processes are laser welding, and electron-beam welding.
Gas Welding
Gas welding is a non-pressure process using heat from a gas flame. The flame is applied directly to the metal, edges to be joined and simultaneously to a filler metal in the form of wire or rod, called the welding rod, which is melted to the joint. Gas welding has the advantage of using equipment that is portable and does not require an electric power source. The surfaces to be welded and the welding rod are coated with flux, a fusible material that shields the material from air, which would result in a defective weld.
Arc Welding
Arc-welding is the most important welding process for joining steels. It requires a continuous supply of either direct or alternating electrical current. This current is used to create an electric arc, which generates enough heat to melt metal and
create a weld.
Arc welding has several advantages over other welding methods. Arc welding is faster because the concentration of heat is high. Also, fluxes are not necessary in certain methods of arc welding. The most widely used arc-welding processes are shielded metal arc, gas-tungsten arc, gas-metal arc, and submerged arc.
Shielded Metal Arc
In shielded metal-arc welding, a metallic electrode, which conducts electricity, is coated with flux and connected to a source of electric current. The metal to be welded is connected to the other end of the same source of current. An electric arc is formed by touching the tip of the electrode to the metal and then drawing it away.The intense heat of the arc melts both parts to be welded and the point of the metal electrode, which supplies filler metal for the weld. This process is used mainly for welding steels.-
Ответов: 1
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6 лет назад
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