Предмет: Физика, автор: lsbpts

ДАМ 12 БАЛЛОВ вычисли работу которую выполнил кран при равномерном поднятии стального каната объёмом 0,5 м³ на высоту 20 м (плотность стали 7,8г/см³)

Ответы

Автор ответа: idleptimp

0

Відповідь:

Пояснення:

Дано

V=0.5m³

h=20m

p=7800кг/м³

g=10H/kg

А-?

A=mgh

m=pV

A=pVgh=7800*05*10*20=780 000Дж=780кДж=0.78МДж

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16 СЕНТЯБРЯ

АНГЛИЙСКИЙ ЯЗЫК - 6 Г

MY IDEAL SCHOOL

УРОК

ВИДЕОКОНФЕРЕНЦИЯ

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My ideal school

Read the text and fill in the gaps. Use one word only.

Dear Lora,

Hi! How are you? Today I want to tell you about the school of my dreams. I study in this school and it really exists. My ideal school is on an island. Our lessons usually are outside in the fresh air. We can sit in a circle on the lawn or under the trees. We have only basic equipment like notebooks, pens and crayons. There are no projectors and we definitely have no laptops in my school. Lessons last half an hour each. We have many interesting lessons like science, wildlife, and nature. In these lessons we usually go on trips to the forest to see wildlife and discuss some problems of nature.

We also do lots of fun after-school activities. Boys mostly enjoy going in for white-water rafting, kayaking and mountain climbing but girls prefer to do gymnastics and swimming. I think in this school all students find activities that he or she likes most.

Also students often travel around the world and learn many things, like the history, culture and language of the places they visit. We already visited such countries as Spain, Italy and Russia. Trips are not something special – they’re part of everyday school life. We try to get knowledge and enjoy life at the same time. This is really great because you have a chance to meet a lot of new people and know about their way of life. All this helps you to widen your horizon and feel happy.

What is your ideal school like?

Write back soon,

Sara

The author wants to tell you about the school of her .

They also do lots of fun after-school .

Trips are not something special – they’re part of everyday school .
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