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материальная точка за 1 мин совершила 200 колебаний.определить период и частоту
Ответы 2
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Частота ν=N/t=200/60 c=3 1/3 Гц
Период Т=1/ν=1:10/3=3/10=0,3 с.
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Автор:
cesáreo - 5 лет назад
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0
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1 мин = 60 сT = t \ NT = 60 \ 200 = 0,3 cf = 1 \ Tf = 1 \ 0,3 ≈ 3,33 Гц
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Автор:
pokeyeverett - 5 лет назад
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0
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My friend will have a birthday party in a week, so I have decided to look for a birthday present for her. I went to the Central Department Store which is situated in the centre of our city. It's a multistoreyed building where one can get everything in the way of food and manu¬factured goods. I must confess it was so difficult to make a suitable purchase in such a huge shop with a lot of counters and shelves.
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There were on sale: haberdashery, stationery, hosiery, leather-wear, knitwear. To tell you the truth, I was impressed by a great choice of silk skirts and shirts, different kinds of frocks and coats, leather boots and shoes, woolen pullovers and sweaters, jeans and suits, jackets and blouses, bags and wallets. There one can get everything in the way of clothes wanted by men, women and children: footwear, knitwear, ready-made clothes, furs and what not. I admired the cut and the style of a light summer frock. It was the latest fashion and I made up my mind to try it on. A pleasant-looking shop-assistant proposed me to put the frock on and look in the mirror. But unfortunately, it was a bit loose on me and didn't suit me perfectly.
On the second floor of the Department Store I could see all kinds of household utensils: crockery, china, electric appliances, cutlery, pots and pans, vacuum-cleaners, wash¬ing machines, cameras, radio and television sets, computers, stereo cassette recorders and many other things one may want in the house. Besides, there were perfumery, florist's, gift and souvenir depart¬ments. The shop-assistant suggested looking at a beautiful water-colo-ur. I liked that nice picture very much and I was sure my friend would like it too. The price of the present wasn't very high, I must admit. So 1 have paid the money at the cash-desk. The cashier gave me a receipt and I came up to the shop-assistant with it again. I produced my receipt and obtained a wrapped-parcel with a shirt. She thanked me and added they were always glad to see me at their shop. I felt very excited at the thought that I had bought a very nice birthday present, and left the shop.
On my way home I suddenly remembered that my mother had given me a few errands. We've run out of bread and I had to drop in at the baker's to buy a loaf of white bread, a loaf of brown one, five rolls and half a dozen small cakes. There was a long queue at the grocer's but 1 had nothing to do but stand in the line for half an hour to buy a kilo of sugar and some sausage. Tnen 1 bought some fruit (bananas and apples) at the vegetable stall near the bus stop.
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