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Консультация № 200193
30.01.2021, 10:15
0.00 руб.
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4
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Здравствуйте, уважаемые эксперты! Прошу вас ответить на следующий вопрос:
Какое поперечное сечение должен иметь стальной стержень, чтобы под нагрузкой 18 кН в нем возникло механическое напряжение 6*10^7 Н/м^2?
Какое поперечное сечение должен иметь стальной стержень, чтобы под нагрузкой 18 кН в нем возникло механическое напряжение 6*10^7 Н/м^2?
Обсуждение
30.01.2021, 12:16
общий
это ответ
Здравствуйте, Залина!
Дано и Надо - запишете Сами...
Решение:
P = F / S
S = F / P
S = 18/60000=0.3*10^-3 м²=0.3 см²
Дано и Надо - запишете Сами...
Решение:
P = F / S
S = F / P
S = 18/60000=0.3*10^-3 м²=0.3 см²
4
30.01.2021, 14:41
общий
30.01.2021, 14:44
Провод длиной 80 см и площадью поперечного сечения 0.5 мм в квадрате, подвешен груз массой 25 кг, при этом провод удлинился на 2 мм. Определить модуль Юнга провода.
30.01.2021, 19:15
общий
это ответ
Здравствуйте, Залина!
Дано:
PH=18*103H
[$963$]=6*107Н/м2 (Па)
Найти: S
Решение:
1. По определению, механическое напряжение - это отношение силы упругости, возникающей в образце под нагрузкой, к площади поперечного сечения образца:
[$963$]=FУ/S (1)
2. Согласно III закону Ньютона, сила упругости, возникающая в образце (в стальном стержне), будет равна по модулю весу тела (нагрузке на стержень) PH:
FУ=РН (2)
3.Решая систему выражений (1) и (2), получаем
S=FУ/[$963$] = PH/[$963$] (3)
Подставляем известные значения:
S=18*103H/6*107Н/м2 = 3*10-4м2 = 3 см2.
Ответ: сечение стержня 3 см2.
Удачи
Дано:
PH=18*103H
[$963$]=6*107Н/м2 (Па)
Найти: S
Решение:
1. По определению, механическое напряжение - это отношение силы упругости, возникающей в образце под нагрузкой, к площади поперечного сечения образца:
[$963$]=FУ/S (1)
2. Согласно III закону Ньютона, сила упругости, возникающая в образце (в стальном стержне), будет равна по модулю весу тела (нагрузке на стержень) PH:
FУ=РН (2)
3.Решая систему выражений (1) и (2), получаем
S=FУ/[$963$] = PH/[$963$] (3)
Подставляем известные значения:
S=18*103H/6*107Н/м2 = 3*10-4м2 = 3 см2.
Ответ: сечение стержня 3 см2.
Удачи
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
30.01.2021, 19:21
общий
30.01.2021, 19:28
Адресаты:
Мини-форум этой консультации создается для обсуждения вопросов, связанных с решением именно этой (той, что в заголовке) задачи.
Здесь не нужно (нельзя) писать условия других задач. Для другой задачи необходимо создать новую консультацию. Ознакомьтесь, пожалуйста, с правилами портала здесь
Здесь не нужно (нельзя) писать условия других задач. Для другой задачи необходимо создать новую консультацию. Ознакомьтесь, пожалуйста, с правилами портала здесь
Об авторе:
С уважением
shvetski
С уважением
shvetski
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