user-avatar
kkien9w
2 năm trước
Người ta muốn tải một công suất điện 4,5kW từ nhà máy thuỷ điện đến một khu dân cư cách nhà Máy 85km. Biết cứ 1km dây dẫn có điện trở 0,9 . a) Hiệu điện thế giữa hai đầu dây tải điện là 25 000V. Tính công suất hao phí vì toả nhiệt trên đường dây. b) Nếu cứ để hiệu điện thế hai đầu đoạn dây tải điện là 220V mà truyền đi thì công suất toả nhiệt trên đường dây là bao nhiêu ? giúp e với
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Parade, celebrations, highlight, feast, chaos Festivals, greasy, religious, seasonal , superstitious 1. Christmas is considered the most famous ______________ festival of the world. 2. Korean New Year’s ______________ begin with everyone wearing traditional dresscalled hanbok. 3. Rock in Rio is one of the world’s biggest music ______________. 4. Pongal is a ______________ festival celebrated to mark the harvest of crops and offer aspecial thanksgiving to God. 5. The Samba______________ is the main attraction of the Rio Carnival celebration. 6. Thanksgiving is traditionally celebrated with a ______________ among family and friends. 7. “Ham up a ______________ pole” is one of the traditions of La Tomatina. 8. The ______________ of Carnival is the Samba Parade which is not to be missed!

XIV. Read the following passage about Michael Jordan. Circle A, B or C to answer each question. Michael Jordan was born on February 17, 1963. He is considered one of the best basketball players ever. He led the Chicago Bulls to six National Basketball Association championships, and won the NBA's Most Valuable Player Award five times. Jordan started studying at the University of North Carolina (UNC) in 1981. He soon became an important member of the school's basketball team. In 1982, with Jordan scoring the final basket, the team defeated Georgetown University and became the champion. He was the College Player of the Year in 1983 and in 1984. In 1984, Jordan became a member of the U.S. Olympic basketball team. The team won the gold medal that year. 1. What team did Michael Jordan play for? A. Chicago Bulls B. National Basketball Association C. Georgetown University 2. How many times did Michael Jordan win the title “College Player of the Year”? A. Six times B. Five times C. Two times 3. When did Michael Jordan start playing for the University of North Carolina? A. 1963 B. 1981 C. 1984 4. What does “the team” in paragraph 2 refer to? A. University of North Carolina B. Georgetown University C. College Player 5. What is the best title of this passage? A. Michael Jordan: life and career B. Michael Jordan: the best basketball player C. Michael Jordan: a professional basketball player XV. Read the passage and answer the questions. Watching television is an interesting and fun activity. The first television broadcast in Australia was in 1956. Back then, the pictures on a TV were black and white only. Television has changed a lot since then. There are several channels and they show different TV programmes. In Western Australia, the main channels are ABC, Seven, Nine, Ten, and SBS. TV guides tell us what programmes are showing on which channel, and at what time on a day. Many programmes on television are episodes. They are part of a series. These episodes usually last for either 30 minutes or a full hour. At the weekend there are interesting films. You can watch them instead of going to the cinema. 1. When was the first Australian TV broadcast? ______________________________________ 2. How were the pictures on a TV then? ______________________________________ 3. List any three TV channels in Western Australia. ______________________________________ 4. Where can you find out the time of your favourite TV show? ______________________________________ 5. How long do episodes on TV usually last for? ______________________________________

2018 © Loga - Không Ngừng Sáng Tạo - Bùng Cháy Đam Mê
Loga Team