Предмет: Геометрия, автор: Аноним

Задание 8.
Какой минимальный объём должна иметь подводная часть надувной лодки массой 10 кг, чтобы удержать на воде юного рыболова с уловом, если масса рыболова равна 40 кг, а вес улова равен 100 Н?
ПРОСТЫМ ЯЗЫКОМ ПОЖАЛУЙСТА!!!

Ответы

Автор ответа: zinovicgrigorij
2

Ответ: 0,06м³

Объяснение:

Дано:

m1=10кг

m2=40кг

Р1=100Н

g=10Н/кг

ρ=1000кг/м³

------------------

V-?

Для того, чтобы лодка удерживалась на плаву необходимо, чтобы вес лодки, рыбака и улова были равны силе Архимеда.

Р=Fa

Р=(m1+m2)*g+P1=(10+40)*10+100=600Н

Силу Архимеда находим по формуле:

Fa=ρ*g*V, где:

ρ-плотность воды;

g-ускорение свободного падения;

V-объем подводной части надувной лодки

Отсюда:

V=Р/(ρ*g)=600/(1000*10)=0,06м³

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Transport in London

London, like other great capitals of Europe, has a complete transport system. More and more people begin to use buses, private

taxis, the underground, trains and bicycles. The system of transportation in London is good for tourists because they serve the

main sightseeing routes. So tourists can go and visit different attractions of London.

The London underground is the oldest in the world. Most of English people call it London Tube, this underground has 275

stations.

The most popular attraction in London is the famous red buses. They travel throughout the city from early morning till night.

They are slower than the underground trains, but it’s the best way to see the city. An important thing to know is that you

cannot buy the bus ticket inside buses, they are sold in every bus station in London and you can buy these before you take any

bus.

Besides the underground people can use classic old black cars. London taxis are as popular as red double-decker buses. In the

capital there are around 23 000 taxis. Taxis drivers know each places and corners of London because they take an

exam. Taking a taxi in London is so expensive if you want travel alone.

Cycling is good for health and environment. In the parks and streets there are a lot of cycling paths. It’s also an excellent way

to see the city as there aren’t any problems with parking and traffic,

Вопросы:1 The London Underground system…

a. is used by tourists only b. carries more than one million people daily c. the best transport in the city d. shows the best city attractions

e. is called the Tube

2 People can buy bus tickets…

a. in the bus b. everywhere c. in the office d. at bus stations e. ask a driver

3 Not so many people use London taxis because they …

a. use underground b. learn more about the place c. are the best d. have problems with traffic e. are very expensive