Water well head is a circle with a radius of 0.7m. It is built into wells surrounding the well head 0.3m wide. Calculate the area of the wells.

1

K

Khách

30 tháng 12 2015

Đầu giếng nước là một vòng tròn có bán kính 0,7m. Nó được xây dựng vào giếng xung quanh giếng 0.3m đầu rộng. Tính diện tích của giếng.

MA

Mai Anh Đàm

27 tháng 3 2022

Find the area of a circle with a radius of 2cm.

Answer: The area of a circle is: ............

1

NL

Nguyễn Lê Phước Thịnh

12 tháng 7 2023

12,57cm

Problem 8. A cuboid container has dimensions as in the figure. The container has 54 liters of water in it. Bình wants to know a full bucket contains how many liters of water, so he pours the whole bucket of water into the container and finds that the level of the water is now 7 8 the height of the container. From that, he is able to calculate how many liters of water a full bucket contains. If the container is empty, how many buckets of water must Bình pour into the container to make it...

DB

đố biết ai

5 tháng 4 2021

A creature with the head of a lion and the body of a fish,it is the symbol of Singapore.

1___________________

#Tiếng anh lớp 8

3

MN

Minh Nhân

5 tháng 4 2021

A creature with the head of a lion and the body of a fish,it is the symbol of Singapore.

1________Merlion___________

Đúng(2)

NC

νì ¢υộ¢ đờι ℓà инữиɢ иιềм đαυ

5 tháng 4 2021

A creature with the head of a lion and the body of a fish,it is the symbol of Singapore.

1________Merlion___________

Đúng(1)

NM

Nguyễn Minh Tùng

8 tháng 7 2016

2

CB

Cậu Bé Cung Thiên Bình

8 tháng 7 2016

Vấn đề 8. Một container có hình khối có kích thước như trong hình. Các thùng có 54 lít nước trong đó. Bình muốn biết một xô đầy chứa bao nhiêu lít nước , do đó, ông đổ cả xô nước vào container và thấy rằng mức độ của nước tại 7 8 là chiều cao của container. Từ đó, ông có thể tính toán bao nhiêu lít nước một xô đầy chứa . Nếu container rỗng , bao nhiêu xô nước phải Bình đổ vào các container để làm cho nó đầy đủ?

TH

Trần Hùng

5 tháng 5

To solve this problem, let's break it down step by step.

Step 1: Calculate the volume of the cuboid container.
The volume of a cuboid is given by the formula:
Volume = Length × Width × Height

Given:
Length = 12 meters
Width = 6 meters
Height = 4 meters

Volume = 12 × 6 × 4 = 288 cubic meters

Step 2: Convert the volume to liters.
Since 1 cubic meter = 1000 liters, we have:
Volume = 288 × 1000 = 288,000 liters

Step 3: Determine the volume of water after pouring a full bucket.
The water level after pouring the bucket is at 7/8 the height of the container, which means the volume of water is 7/8 of the volume of the container.

Volume of water = (7/8) × 288,000 liters = 252,000 liters

Step 4: Calculate the volume of water in one bucket.
Since initially, there were 54 liters in the container and after pouring the bucket, there were 252,000 liters, the volume of water in one bucket can be found by subtracting the initial volume from the final volume.

Volume of water in one bucket = 252,000 liters - 54 liters = 251,946 liters

Step 5: Determine how many buckets are needed to fill the container.
To find out how many buckets are needed to fill the container, divide the volume of the container by the volume of water in one bucket.

Number of buckets needed = 288,000 liters / 251,946 liters ≈ 1.144

Since Bình cannot pour a fraction of a bucket, he would need to pour 2 buckets of water to fill the container completely.

TV

tran viet duc

13 tháng 3 2021

a creature with the head of a lion and the body of a fish it is the symboi of singapore ai dich ho minh

#Tiếng anh lớp 6

4

Y

YunTae

13 tháng 3 2021

dịch : Một sinh vật có đầu sư tử và thân cá, nó là biểu tượng của Singapore

b1 điền từ và trả lời câu hỏi there is a lot of salt on earth, and it mixes very well with water. there is some salt in all water. Water on the........... runs into lakes and rivers. These rivers run into the seas and oceans. They carry a little salt............. them. Some of the ocean water moves into the air and clouds. It evaporates. Salt cannot evaporate. It.......... in the ocean. some lakes do not have a river to carry the water and salt away. Some of the water leaves the...

LT

Lê Trang

13 tháng 3 2021

a creature with the head of a lion and the body of a fish it is the symbol of singapore

-> Một sinh vật có đầu sư tử và thân cá, nó là biểu tượng của Singapore.

Đúng(1)

LL

linh linhnhi

17 tháng 4 2019

Lesson 1: Trapezoid sheet has a large bottom 2.8dm, baby bottom 1.6dm, height 0.8dm.a) Calculate the area of the cardboard?b) Cut a quarter of the area. Calculate the area of the cardboard remaining?Lesson 2: ABCD rectangle with DC length = 27cm, AD = 20.4cm. E is a point on AB. Calculate the area of the triangle ECD?Lesson 3: (HSKG): A trapezoidal field with a baby bottom 26m, the bottom is 8m lower than baby, the bottom is 6m lower. Average 100m2 harvested 70.5 kg paddy. How much is the field...

#Tiếng anh lớp 7

0

T

Takao

8 tháng 11 2017

6

TM

thai my phung

8 tháng 11 2017

i don't no

please write Vietnamese

T

Takao

8 tháng 11 2017

I can't

1, Complete the passage with the words given in the boxshady/ landscapes/familiar/water/seen/waves/beach/considered/moving/cloudsMui Ne is located 24km north-east of the city of Phan Thiet .It is a fishing village as well as a ....................(1) tourism area in Binh Thuan Province.It is a found on Highway No.706,and is famous for sweeping sand dunes and beautiful rows of palm trees. The ................(2)is shallow and slopes,the......................(3) is clean and blue and the sun...

NB

nguyễn bùi phương anh

8 tháng 12 2019

#Tiếng anh lớp 6

1

NL

Ngọc Linh

8 tháng 12 2019

1. familier

2. beach

3. water

4. clouds

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.Early peoples had no need of engineering works to supply their water. Hunters and nomads camped near natural sources of fresh water, and populations were so sparse that pollution of the water supply was not a serious problem. After community life developed and agricultural villages became urban centres, the problem of supplying water became important for...

LQ

Lê Quỳnh Anh

9 tháng 12 2017

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

Early peoples had no need of engineering works to supply their water. Hunters and nomads camped near natural sources of fresh water, and populations were so sparse that pollution of the water supply was not a serious problem. After community life developed and agricultural villages became urban centres, the problem of supplying water became important for inhabitants of a city, as well as for irrigation of the farms surrounding the city. Irrigation works were known in prehistoric times, and before 2000 BC the rulers of Babylonia and Egypt constructed systems of dams and canals to impound the flood waters of the Euphrates and Nile rivers, controlling floods and providing irrigation water throughout the dry season. Such irrigation canals also supplied water for domestic purposes. The first people to consider the sanitation of their water supply were the ancient Romans, who constructed a vast system of aqueducts to bring the clean waters of the Apennine Mountains into the city and built basins and filters along these mains to ensure the clarity of the water. The construction of such extensive water-supply systems declined when the Roman Empire disintegrated, and for several centuries local springs and wells formed the main source of domestic and industrial water.

The invention of the force pump in England in the middle of the 16th century greatly extended the possibilities of development of water-supply systems. In London, the first pumping waterworks was completed in 1562; it pumped river water to a reservoir about 37 m above the level of the River Thames and from the reservoir the water was distributed by gravity, through lead pipes, to buildings in the vicinity.

Increased per-capita demand has coincided with water shortages in many countries. Southeast England, for example, receives only 14 per cent of Britain's rainfall, has 30 per cent of its population, and has experienced declining winter rainfall since the 1980s.

In recent years a great deal of interest has been shown in the conversion of seawater to fresh water to provide drinking water for very dry areas, such as the Middle East. Several different processes, including distillation, electrodialysis, reverse osmosis, and direct-freeze evaporation, have been developed for this purpose. Some of these processes have been used in large facilities in the United States. Although these processes are successful, the cost of treating seawater is much higher than that for treating fresh water

Which of the following is NOT mentioned as a process of convertinging seawater to freshwater?

A. Water evaporation

B. Purification method

C. Steaming and cooling

D. Dissolving chemicals

#Mẫu giáo

1

DH

Dương Hoàn Anh

9 tháng 12 2017

Đáp án D
A,B,C đều được nhắc đến ở đoạn cuối: distillation, electrodialysis, reverse osmosis, and direct-freeze evaporation (khử muối, điện phân, lọc thẩm thấu ngược- Purification method, và trực tiếp đóng băng bốc
hơi - Steaming and cooling, Water evaporation)
Chỉ có D là không được nhắc đến

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. Early peoples had no need of engineering works to supply their water. Hunters and nomads camped near natural sources of fresh water, and populations were so sparse that pollution of the water supply was not a serious problem. After community life developed and agricultural villages became urban centres, the problem of supplying water became...

LQ

Lê Quỳnh Anh

30 tháng 8 2017

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions.

         Early peoples had no need of engineering works to supply their water. Hunters and nomads camped near natural sources of fresh water, and populations were so sparse that pollution of the water supply was not a serious problem. After community life developed and agricultural villages became urban centres, the problem of supplying water became important for inhabitants of a city, as well as for irrigation of the farms surrounding the city. Irrigation works were known in prehistoric times, and before 2000 BC the rulers of Babylonia and Egypt constructed systems of dams and canals to impound the flood waters of the Euphrates and Nile rivers, controlling floods and providing irrigation water throughout the dry season. Such irrigation canals also supplied water for domestic purposes. The first people to consider the sanitation of their water supply were the ancient Romans, who constructed a vast system of aqueducts to bring the clean waters of the Apennine Mountains into the city and built basins and filters along these mains to ensure the clarity of the water. The construction of such extensive water-supply systems declined when the Roman Empire disintegrated, and for several centuries local springs and wells formed the main source of domestic and industrial water.
          The invention of the force pump in England in the middle of the 16th century greatly extended the possibilities of development of water-supply systems. In London, the first pumping waterworks was completed in 1562; it pumped river water to a reservoir about 37 m above the level of the River Thames and from the reservoir the water was distributed by gravity, through lead pipes, to buildings in the vicinity.
Increased per-capita demand has coincided with water shortages in many countries. Southeast England, for example, receives only 14 per cent of Britain's rainfall, has 30 per cent of its population, and has experienced declining winter rainfall since the 1980s.
          In recent years a great deal of interest has been shown in the conversion of seawater to fresh water to provide drinking water for very dry areas, such as the Middle East. Several different processes, including distillation, electrodialysis, reverse osmosis, and direct-freeze evaporation, have been developed for this purpose. Some of these processes have been used in large facilities in the United States. Although these processes are successful, the cost of treating seawater is much higher than that for treating fresh water

Which of the following is NOT mentioned as a process of conversing seawater to freshwate

A. Steaming and cooling.

B. Water evaporation.

C. Dissolving chemicals.

D. Purification method.

#Mẫu giáo

1

DH

Dương Hoàn Anh

30 tháng 8 2017

Đáp án B

Cái nào dưới đây không được đề cập như là 1 quá trình biến nước biển thành nước sạch?
A. Bốc hơi và làm lạnh.
B. Hòa tan hóa chất.
C. Sự bay hơi nước.
D. Phương pháp lọc.
Dẫn chứng ở câu thứ 2 đoạn cuối cùng: “Several different processes, including distillation, electrodialysis, reverse osmosis, and direct-freeze evaporation, have been developed for this purpose”- (Một vài quá trình bao gồm trưng cất, thẩm tách bằng điện, thẩm thấu ngược, bốc hơi đã được phát triển để phục vụ cho mục đích này)=> A, C, D được nhắc tới, còn lại B là không.