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Тіло зісковзуе по похилій площині маючи початкову механічну енергію 20 Дж. Внизу механічна енергія тіла дорівнює 5 Дж. Чому дорівнює робота сили тертя за час спуску?
Ответы 1
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По закону сохранения энергии:A = 20 - 5 = 15 Дж
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Автор:
george92 - 5 лет назад
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помогите пожалуйста задать 15 вопросов к этому тексту
UNIT ONE
TEXT ONE THE
PASSIONATE YEAR
By James Hilton
(Fragments)
James Hilton (1900—1954) was born in England and educated at Cambridge
where he wrote his first novel, "Catherine Herself". His first big success came with
the publication of "Good-bye, Mr. Chips". It was dramatized and filmed. "Lost
Horizon" published in 1933 was awarded the Hawthornden Prize. Some of his other
books are: "We Are Not Alone" (1937), "Random Harvest" (1941), "Nothing So
Strange" (1947), "Time and Time Again" (1953). A resident of the United States since
1935, he died in Long Beach, California.
(Kenneth Speed, B.A., a young Master at Millstead Boarding School for boys,
was warned that the first night he takes prep1 he might be ragged2 as it was a sort of
school tradition that they always tried to rag teachers that night.
Preparation for the whole school was held in Millstead Big Hall, a huge vaultlike chamber in which desks were ranged in long rows and where Master in charge
sat on high at a desk on a raised dais.)
Speed was very nervous as he took his seat on the dais at five to
seven and watched the school straggling to their places. They came
in quietly enough, but there was an atmosphere of subdued expectancy of which Speed was keenly conscious; the boys stared about
them, grinned at each other, seemed as if they were waiting for something to happen. Nevertheless, at five past seven all was perfectly
quiet and orderly, although it was obvious that little work was being
done. Speed felt rather as if he were sitting on a powder-magazine,
and there was a sense in which he was eager for the storm to break.
At about a quarter past seven a banging of desk-lids began at the
far end of the hall.
He stood up and said, quietly, but in a voice that carried well: "I
don't want to be hard on anybody, so I'd better warn you that I shall
punish any disorderliness very severely."
There was some tittering, and for a moment or so he wondered if
he had made a fool of himself.
Then he saw a bright, rather pleasant-faced boy in one of the back
rows deliberately raise a desk-lid and drop it with a bang. Speed consulted the map of the desks that was in front of him and by counting
down the rows discovered the boy's name to be Worsley. He wondered
13how the name should be pronounced — whether the first syllable
should rhyme with "purse" or with "horse". Instinct in him, that uncanny feeling for atmosphere, embarked him on an outrageously bold
adventure, nothing less than a piece of facetiousness, the most dangerous weapon in a new Master's armoury, and the one most of all likely
to recoil on himself. He stood up again and said: "Wawsley or Wurss-ley
— however you call yourself — you have a hundred lines!"3
The whole assembly roared with laughter. That frightened him a
little. Supposing they did not stop laughing! He remembered an
occasion at his own school when a class had ragged a certain Master
very neatly and subtly by pretending to go off into hysterics of laughter at some trifling witticism of his.
When the laughter subsided, a lean, rather clever-looking boy
rose up in the front row but one and said, impudently: "Please sir, I'm
Worsley. I didn't do anything."
Speed replied promptly: "Oh, didn't you? Well, you've got a hundred lines, anyway."
"What for, sir" — in hot indignation.
"For sitting in your wrong desk."
Again the assembly laughed, but there was no mistaking the respectfulness that underlay the merriment. And, as a matter of fact,
the rest of the evening passed entirely without incident. After the
others had gone, Worsley came up to the dais accompanied by the
pleasant-faced boy who dropped the desk-lid. Worsley pleaded for
the remission of his hundred lines, and the other boy supported him
urging that it was he and not Worsley who had dropped the lid.
"And what's your name?" asked Speed.
"Naylor, sir."
"Very well, Naylor, you and Worsley can share the hundred lines
between you." He added smiling: "I've no doubt you're neither of you
worse than anybody else but you must pay the penalty of being pioneers."
They went away laughing.
That night Speed went into Clanwell's room for a chat before
bedtime, and Clanwell congratulated him fulsomely on his successful passage of the ordeal.4 "As a matter of fact," Clanwell said, "I
happen to know that they'd prepared a star benefit performance for
you but that you put them off, somehow, from the beginning. The
14
prefects5 get to hear of these things and they tell me. Of course, I
don't take any official notice of them. It doesn't matter to me what
plans people make — it's when any are put into execution that I wake
up. Anyhow, you may be interested to know that the members of
School House6 subscribed over fifteen shillings to purchase fireworks
which they were going to let off after the switches had been turned
off! Alas for fond hopes ruined!"
Clanwell and Speed leaned back in their armchairs and roared
with laughter.-
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