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Пружине колеблется стеклянный шар с периодом колебаний 1 секундa. Каким станет период колебание если шар заменить на стеклянный шар с диаметром в 4 раза больше
Ответы 1
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Масса шара пропорциональна кубу диаметра. Значит масса увеличиться в 64 раза. Период колебаний T=2*П*Корень(m*k) пропорционален корню из массы. Значит период увеличиться в корень из 64 = 8
Ответ 8 с
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Автор:
fresiertxor - 6 лет назад
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ПОМОГИТЕ ПОЙЖАЛУЙСТА
Rita Nelson is fourteen, and she has changed her school because her parents moved to another town this summer.
“Let me tell you about my new school. I’m having a great time. All pupils are very friendly, but it’s very different from my old school. I can tell you! First of all school starts at 8.00 here, a whole, hour before it did in that school. This morning I forgot about it and got to school ten minutes late, so the teacher put a note into my record-book. I was really angry!
There are a lot of other differences in this school, of course. We have seven lessons here almost every day. What else? The school day is different, too. In my former school we finished school at 3.00, and then most pupils went home. Here we finish lessons at 3.30, and then most pupils go to sports practice. Well, they love sports here.
I joined gymnastics and football clubs here. A lot of girls play football in this school. I had my first practice yesterday, and I feel tired today.
Another important thing here is learning to do practical things. Their metal and wood shops are like small factories, and we are taught to drive as well. It’s fantastic. I had my first lesson in driving a tractor yesterday.”
Exercise 1. Choose the right answer.
Rita Nelson is _______
a) 13 b) 14 c) 15
Lessons in Rita’s previous school started at
a) 7 o’clock b) 8 o’clock c) 9 o’clock
Rita has _______ lessons every day.
a) 5 b) 6 c) 7
Rita’s lessons are over at
a) 3. 00 b) 3.30 c) 4.00
After lessons most pupils go
a) to sports practice b) home c) for a walk
Exercise 3. True or false?
1)Rita doesn’t like her new school.
2)Today Rita came to school in time.
3)Student don’t love sports in the new school.
4)Many girls play football in the new school.
5)Rita likes to drive a tractor.
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