Ирина Эланс
kntr-2 Вариант №10 договор 0 10.1. Частица движется так, что ее радиус-вектор зависит от времени по закону r ⃗(t)=i ⃗∙2t^3+j ⃗∙3t^4+k ⃗∙4 , где i ⃗ , j ⃗, k ⃗ – единичные орты в декартовой системе координат. Найдите тангенс угла, под которым будет направлена скорость к оси х в момент времени t=1 c. (Решение → 723)
Описание
MANAGER’S WORKING DAY
Mr Price stood at the window of his office. He had stopped working at last. The building was empty. Everyone has gone home by half past five. Now it was half past six and the street below had emptied.
What a busy day he had had! He had arrived at the office well before nine oclock. Why, before nine oclock he had made two telephone calls! The other offices were still empty when he had phoned, so, of course, nobody had answered the telephone. Poor Mr Price!
But then he had opened all the correspondence. By ten oclock, he had dictated replies to nearly all the letters. When Miss King left the room, he had started to make telephone calls again. By the time the Acting Manager sent for him, he had talked to three of the buyers. When the Acting Manager had asked him for information about stocks, he had been able to give the information from memory. He was sure the Acting Manager had noticed that!
By one oclock, he had examined the figures from the production sheets and he had signed a dozen letters for Miss King. By two oclock, he had had his lunch and he had done a lot more work on those production figures. By three oclock, he had found two mistakes! By four oclock, he had seen both the Production Manager and the Foreman. He had asked them for an explanation. He had pointed out that the explanation was urgent. By ten oclock tomorrow, the corrected figures must be on his desk. Mr Price sighed. What a load of responsibility he had!
Mr Price sighed again. Tomorrow he must make more telephone calls; he must dictate more letters; he must try again to speak to the Acting Assistant Manager. But now he must go home. He put on his coat and his hat. He picked up his attache case and his umbrella and went to the door. He locked the door and walked towards the lift. Then he stopped. He had turned off the electric fire near his desk. It was a quarter to seven. Really, he worked too hard!
Mr Price stood at the window of his office. He had stopped working at last. The building was empty. Everyone has gone home by half past five. Now it was half past six and the street below had emptied.
What a busy day he had had! He had arrived at the office well before nine oclock. Why, before nine oclock he had made two telephone calls! The other offices were still empty when he had phoned, so, of course, nobody had answered the telephone. Poor Mr Price!
But then he had opened all the correspondence. By ten oclock, he had dictated replies to nearly all the letters. When Miss King left the room, he had started to make telephone calls again. By the time the Acting Manager sent for him, he had talked to three of the buyers. When the Acting Manager had asked him for information about stocks, he had been able to give the information from memory. He was sure the Acting Manager had noticed that!
By one oclock, he had examined the figures from the production sheets and he had signed a dozen letters for Miss King. By two oclock, he had had his lunch and he had done a lot more work on those production figures. By three oclock, he had found two mistakes! By four oclock, he had seen both the Production Manager and the Foreman. He had asked them for an explanation. He had pointed out that the explanation was urgent. By ten oclock tomorrow, the corrected figures must be on his desk. Mr Price sighed. What a load of responsibility he had!
Mr Price sighed again. Tomorrow he must make more telephone calls; he must dictate more letters; he must try again to speak to the Acting Assistant Manager. But now he must go home. He put on his coat and his hat. He picked up his attache case and his umbrella and went to the door. He locked the door and walked towards the lift. Then he stopped. He had turned off the electric fire near his desk. It was a quarter to seven. Really, he worked too hard!
- Jupyter Notebook.
- kntr-2 Вариант №10 договор 0 10.1. Частица движется так, что ее радиус-вектор зависит от времени по закону r ⃗(t)=i ⃗∙2t^3+j ⃗∙3t^4+k ⃗∙4 , где i ⃗ , j ⃗, k ⃗ – единичные орты в декартовой системе координат. Найдите тангенс угла, под которым будет направлена скорость к оси х в момент времени t=1 c.
- kntr-2 Вариант №1 1.1. Частица движется так, что ее радиус-вектор зависит от времени по закону r ⃗(t)=i ⃗∙4t^3+j ⃗∙(2t^4-4t^6 )+k ⃗∙sin〖π/2 t〗 , где i ⃗ , j ⃗, k ⃗ – единичные орты в декартовой системе координат. Через сколько секунд скорость частицы окажется перпендикулярной оси y.
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