Предмет: Физика, автор: саша3095

при каком условии тело под действием силы движется прямолинейно а при каком криволинейно

Ответы

Автор ответа: romaromawka

если вектор скорости не меняет свое направление, то тело движется прямолинейно, иначе криволинейно

Автор ответа: kir3740

Прямолинейно будет двигаться, только если сила параллельна скорости. Если же нет, тело начнет поворачивать и движение станет криволинейным

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MARIE CURIE AND THE DISCOVERY OF RADIUM

Marie Curie was born in Warsaw on November 7, 1867. Her father was a teacher of science and mathematics in a school, and it was from him that little Marie Sklodowska (her Polish name) learned her first lesson of science.
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1. Why did Marie go to Paris?
a) to discover the mystery of the rays of uranium
b) to continue her studies
c) to begin her research
2. What was the result of her numerous experiments?
a) She discovered the mystery of the rays of uranium.
b) She found that one mineral emitted much more powerful rays than uranium.
c) She proved that the mineral contained some new elements.
3. Why did little Marie learn her first lessons from her father?
a) because he was a teacher
b) because she was a clever girl
c) because there were no schools in the suburbs of Warsaw

III. Закончите предложения по содержанию прочитанного текста.
4. Pierre and Marie Curie were greatly interested ….
a) in researches
b) in X-rays
c) in the work of the French scientist Becquerel
5. There was no proper apparatus and very little space ….
a) for laboratory experiments
b) for research work
c) for scientific work
6. Pierre Curie was famous throughout Europe ….
a) for his discovery of X-rays
b) for his discovery in magnetism
c) for his discovery of uranium
7. In 1891 Marie went to Paris ….
a) to discover the mystery of the rays of uranium
b) to obtain Doctor’s degree
c) to continue her studies
8. Besides uranium Marie Curie began to examine ….
a) X-rays
b) the rays of uranium
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