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Тело движется по закону s(t) = t^2-5t+3 определите в какой момент времени скорость тела будет равна 15
Ответы 1
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Скорость равна первой производной от пепемещения,соответственно v(t)=2*t-5 теперь 2t-5=15 2t=20 => t=10 сек
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Автор:
louiserickson - 6 лет назад
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Task 4
Read the text below. Choose from (A-H) the
one which best fits each space (17-22). There are two choices you do not need to use. Write your answers on the answer sheet.
On Parrots
Parrots are becoming one of the most popular pets in America — and for good reason. The parrot is (17)
that can be taught to talk, can be easily cared for, and can (18) anywhere. With the help of an
energetic parrot owner, a parrot can develop (19) . In addition, a parrot can be trained to say ‘pretty boy’ or
‘Polly wants a cracker,’ and it also can learn to whistle or even to imitate human singing.
(20) what an owner decides to teach a bird, training a parrot (21) , but the reward is a stream
of chatter. Another reason for the parrot’s popularity is that this pet does not require much care. For example, even a spoiled parrot does not need a housesitter for the purpose of daily walks and daily feeding. In fact, a parrot owner may leave his or her pet with enough food for five days and have no fear that the parrot will overeat. Still another advantage of owning a parrot is its inexpensive diet, which consists of an assortment of seeds, nuts, com, and grain — along with an apple, banana, or carrot.
Perhaps the most likely reason the parrot is becoming such a well-liked pet is that it is a combination of
tameness and wildness. Because the parrot can live (22) , it makes a fine, tame companion for many people.
In addition, because it can be easily trained, it is a delightful performer. At the same time, its colourful feathers give it an air of the mystery of the parrot’s native home, the jungle. Thus, the parrot, once a highly valued gift presented to kings and noble families, is now appreciated by a growing number of people.
A popular pets
B an extraordinary bird C takes much patience
D create a fantasy-like atmosphere
E an enormous vocabulary
F No matter
G light year
H in almost any environment-
Предмет:
Английский язык -
Автор:
amir69 - 6 лет назад
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