Предмет: Физика, автор: Аноним

100 БАЛОВ!!!

Радісний собака зустрічає хазяїна. Рівняння руху собаки та хазяїна має вигляд: x1=11,5t і x2=800-t . Охарактеризуйте: а) місце їхньої зустрічі та час, через який вона станеться; б) координату собаки та хазяїна через 10 с від початку спостереження.

Ответы

Автор ответа: 555ai555

Ответ:

Объяснение:

x1=11,5t

x2=800-t

время встречи

11,5*t = 800-t

t = 800 / 12.5 = 64 c

координата встречи

x = 800 - 64 = 736 м

найдем координаты через 10 с

x1(10) = 11.5*10 = 115 м

x2(10) = 800 - 10 = 790 м

redlom04: Почему t = 800 / 12.5 = 64с ?, а не t = 800 / 11.5 = 64 c?

redlom04: t = 800 / 11.5 = 69.57

Аноним: 11,5*t = 800-t мы переносим -t перед ровно,то есть у нас получается 11.5*2t

Аноним: ой,не 11.5*2t, а 11.5t+t=12.5t

555ai555: чистая математика 11,5*t = 800-t тогда 11.5*t+t = 800....12.5*t = 800

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One year I lived in the northern part of Canada, near a blue lake, with green trees all around. That part of Canada is also the home of the wild geese, and I longed to hear their "honk." When the wild geese come, it means that the snow will soon melt, and the game will be back in the brown hills, that the winter is over and the warm, bright days will be here. This is the message that the honk of the wild geese, flying in the sky, brought to our ancestors thousands of years ago, and this is the message that I waited for.

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At last the six shells opened, and six golden chicks peeped out. The next day they left the nest, — the mother first and the chicks close behind her, and last the father. This order they always kept. The mother always leads, and the father follows — yes, obeys. And what a brave guard he was! The gander will fight anything alive, if his little ones are in danger, and there are very few animals or birds of his size that can face him.

So the flock grew big and strong. In three months they were almost as big as the old ones. In four months their wings were strong enough to fly. Their voices were still small and thin, and they did not yet have the deep honk of the older geese. Then they began to make short flights across the lake. As their wings grew stronger, their voices became deeper and deeper.

Soon the thing I dreamed of happened, — the flock of wild geese flew up into the air and "honked". But each time they came back to their home water that was also mine. Now their flights were longer and higher. But they always came back to the lake.

One day, at the end of September, when the leaves began to fall, flocks of small birds flew over the lake. Above them were flocks of wild geese from the far north on their way to the warm south, and I heard their loud "honk". The wild geese on my lake looked up and answered, and at once began to line up on the lake. Their mother led the way, swimming fast and faster. Then she quacked, then called and then their voices rose. "Honk, honk!" they cried, and they flew away to join the other honkers in the southern sky.

"Honk, honk, honk!" they shouted as they flew. But — what! The mother was not in the line. She still splashed on the surface of the lake. And now their loud "On, on! Come on!" was answered by the mother, and the father too, — "Come back! Come back!" So the young ones returned, splashing down on the lake at the call of the mother.

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