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Консультация № 189269
25.04.2016, 21:38
0.00 руб.
0
4
1
Здравствуйте! У меня возникли сложности с таким вопросом:
Алюминиевый брусок массой 270 г опущен в спирт. Чему равна действующая на брусок архимедова сила? Чему равен вес алюминиевого бруска в спирте?
Алюминиевый брусок массой 270 г опущен в спирт. Чему равна действующая на брусок архимедова сила? Чему равен вес алюминиевого бруска в спирте?
Обсуждение
25.04.2016, 22:34
общий
это ответ
Здравствуйте, svrvsvrv!
Дано:
(Al)
m=0,27 кг
[ро]а=2700 кг/м^3 - плотность алюминия
(Спирт)
[ро]с=800 кг/м^3 - плотность спирта.
Найти:
Fa; Pc
Решение:
1. Найдём объём бруска через плотность
V=m/[ро]а = 10^-4 м^3
2. Найдём силу Архимеда
F=[ро]с*g*V = 0,8 H
3. Найдём вес бруска, опущенного в спирт
Рс= mg-F = 1,9 H
Дано:
(Al)
m=0,27 кг
[ро]а=2700 кг/м^3 - плотность алюминия
(Спирт)
[ро]с=800 кг/м^3 - плотность спирта.
Найти:
Fa; Pc
Решение:
1. Найдём объём бруска через плотность
V=m/[ро]а = 10^-4 м^3
2. Найдём силу Архимеда
F=[ро]с*g*V = 0,8 H
3. Найдём вес бруска, опущенного в спирт
Рс= mg-F = 1,9 H
5
Об авторе:
С уважением
shvetski
С уважением
shvetski
25.04.2016, 23:14
общий
Спасибо за помощь. Объясните, пожалуйста, 3-е действие. Почему вес бруска в спирте находится именно так?
26.04.2016, 07:26
общий
26.04.2016, 07:28
Адресаты:
Берём карандашик и рисуем: жидкость, затем внутри жидкости брусочек. Далее. Две стрелочки - одна вниз, это сила тяжести, подписываем mg, другая вверх, это сила Архимеда, она покороче, подписываем F. Теперь смотрите: вес бруска - это разница между mg и F. ))
Удачи.
Пс. Физика-7. Там можно найти похожие рисунки и задачи.
ППС. Ваша задача #3 решается также.
Удачи.
Пс. Физика-7. Там можно найти похожие рисунки и задачи.
ППС. Ваша задача #3 решается также.
Об авторе:
С уважением
shvetski
С уважением
shvetski
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