при подъеме ведра с водой массой m=10 кг на высоту h=1,0 м силой упругости троса была совершена работа A=120 Дж. Равномерно ли поднимали ведро?

при подъеме ведра с водой массой m=10 кг на высоту h=1,0 м силой упругости троса была совершена работа A=120 Дж. Равномерно ли поднимали ведро?
- Предмет:
  Физика
- Автор:
  houdini
- 5 лет назад

Ответы 1

Если сила упругости F_{elast} = mg, то ускорение ведра с водой a = 0. Делаем это предположение. Тогда работа по подъему ведра равна:A^{'} = mgh = 100 Дж \neq A .Т.е. предположение сделано неверно, а, значит ведро поднимали с ускорением, т.е. не равномерно.
- Автор:
  keeshacpss
- 1 год назад
- 4
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30б переведите, пожалуйста, красивым литературным переводом!!!

The tailor sat down, close over the fire, lamenting: "One-and-twenty buttonholes of cherry-coloured silk! To be finished by noon of Saturday: and this is Tuesday evening. Was it right to let loose those mice, undoubtedly the property of Simpkin? Alack, I am undone, for I have no more twist!"
The little mice came out again and listened to the tailor; they took notice of the pattern of that wonderful coat. They whispered to one another about the taffeta lining and about little mouse tippets.

And then suddenly they all ran away together down the passage behind the wainscot, squeaking and calling to one another as they ran from house to house.

Not one mouse was left in the tailor's kitchen when Simpkin came back. He set down the pipkin of milk upon the dresser, and looked suspiciously at the tea-cups. He wanted his supper of little fat mouse!

"Simpkin," said the tailor, "where is my TWIST?"

But Simpkin hid a little parcel privately in the tea-pot, and spit and growled at the tailor; and if Simpkin had been able to talk, he would have asked: "Where is my MOUSE?"

"Alack, I am undone!" said the Tailor of Gloucester, and went sadly to bed.

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The poor old tailor was very ill with a fever, tossing and turning in his four-post bed; and still in his dreams he mumbled: "No more twist! No more twist!"

What should become of the cherry-coloured coat? Who should come to sew it, when the window was barred, and the door was fast locked?

Out-of-doors the market folks went trudging through the snow to buy their geese and turkeys, and to bake their Christmas pies; but there would be no dinner for Simpkin and the poor old tailor of Gloucester.

The tailor lay ill for three days and nights; and then it was Christmas Eve, and very late at night. And still Simpkin wanted his mice, and mewed as he stood beside the four-post bed.

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при подъеме ведра с водой массой m=10 кг на высоту h=1,0 м силой упругости троса была совершена работа A=120 Дж. Равномерно ли поднимали ведро?

Ответы 1

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