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Средняя квадратичная скорость молекул кислорода при 927?С равна 960 м/с. Какова средняя квадратичная скорость этих молекул при 27?С?
1) 200мс
2)824 мс
3) 320 мс
4)480 мс
Ответы 1
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V=sqrt(3*R*T/M)V1/V2=sqrt(T1/T2)V2=V1/sqrt(T1/T2)=960/sqrt(1200/300)=480 м/с
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Автор:
parkershaffer - 6 лет назад
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Переведите текст и выполните задание.
SEASONS
It is very nice in spring. The sky is often blue. The sun shines brightly in the sky. It is warm. It sometimes rains, but the rain is warm and pleasant.
Spring is a hard time for those who live in the country. There is a lot of work to do in the fields. Sometimes people are busy from morning till night.
Summer is as nice as spring. It is warm and sometimes hot. It is warmer and hotter than in spring. The days are longer than in spring. The longest day of the year is the 22nd of June. In summer we usually have our holidays or just three or four weeks of a rest.
Summer is a pleasant season. There are a lot of fruit and vegetables at that time. After summer autumn comes. The days are shorter than in summer. The weather is not so pleasant as in spring and in summer. It often rains. The rain is cold and not pleasant at all.
Winter is the coldest season in the year. It often snows. Some people like when it snows. The ground is all white with snow.
I. Выберите правильное утверждение, соответствующее информации, данной в тексте:
a) The sky in spring is often 1) blue; 2) dark; 3) grey.
b) The days in summer are 1) shorter; 2) longer than in spring; 3) as long as in the spring.
c) There is a lot of 1) mushrooms; 2) nuts and berries; 3) fruit and vegetables at that time.
II. Верны ли следующие утверждения?
a) It is very nice in spring.
b) The weather in autmtm is as pleasant as in spring and in summer.
c) Winter is the coldest season in the year.
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