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Нужна помощь с задачей: чему равен вектор перемещения и пройденный путь, если материальная точка двигаясь по окружности совершила два полных оборота?Длина окружности 2Pi R значит пройденный пусть 4 Pi R^2 ? Как найти вектор перемещения?
Ответы 1
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если 2 полных оборота, то перемещение равно нулювектор перемещения имеет нулевую длинуполный путь равен длине двух окружностейS=2*pi*r*n=2*pi*r*2=4*pi*r
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Автор:
willowgse8 - 6 лет назад
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IN A SMALL TOWN
Toscanini was a great musician. He lived in America.
One day he came to a very little town. He was walking along the street when he
saw a piece of paper in one of the windows. He read:
MRS.SMITH.MUSIC LESSONS.
TWO DOLLARS A LESSON.
Then Toscanini heard the music. Somebody was playing
Tchaikovsky.
“Mrs. Smith is playing,” he thought, “she isn’t a very
good musician. She doesn’t play Tchaikovsky well. I must show her how to play
it.”
He went up to the door of the house and rang. The
music stopped and soon a woman opened the door.
“Are you Mrs. Smith?” asked Toscanini. “My name is
Toscanini and I want to show you how to play Tchaikovsky.”
Mrs. Smith was very glad to meet the great musician.
She asked him to come in. Toscanini played Tchaikovsky for her and went away.
A year later Toscanini visited the same town again.
When he went up to the house where he had played Tchaikovsky the year before he
again saw a piece of paper. Now it read.
MRS.SMITH. (TOSCANINI’S PUPIL)
MUSIC LESSONS.
FOUR DOLLARS A LESSON.
1. Put “+” if the sentence is right and “-“if it is
wrong.
1. Toscanini came to a very little town.
2. He liked how Mrs. Smith was playing.
3. He wanted to play the piano for her.
4. Tchaikovsky visited Mrs. Smith one day.
5. Mrs. Smith was a teacher of music.
2. Write the sentences in the right order.
1.
Mrs. Smith was
very glad to meet the great musician.
2.
He
lived in America.
3.
The music
stopped and soon a woman opened the door.
4.
The music
stopped and soon a woman opened the door.
5.
“Mrs. Smith is
playing,” he thought, “she isn’t a very good musician.
3. Answer the
questions.
1.
Where
did Toscanini live?
2.
Toscanini was a
great musician, wasn’t he?
3.
Did he want to
show Mrs. Smith how to play?
4.
What did he see
in one of the window?
5.
Did he think
that Mrs. Smith was playing well?-
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Английский язык -
Автор:
larryswanson - 6 лет назад
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Ответов:
1 -
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