Hãy lấy 3 ví dụ về những hiện tượng, ứng dụng có lợi và có hại của sự nở vì nhiệt trong thực tế.

1 câu trả lời

Đáp án:

 

Giải thích các bước giải:

Có lợi

- Khi những chiếc chén (cốc) thủy tinh bị dính lại ta có thể hơ nóng những chiếc ở dưới thì chiếc chén ở dưới dãn nở và rộng ra như thế có thể tháo lần lượt ra

- ứng dụng trong chế tạo băng kép ( khi bị đột nóng thì băng kép bị cong) là thiết bị đóng ngắt mạch điện

 - nhiệt kế thủy ngân khi có nhiệt độ cao thủy ngân dãn nở và đến vạch nhiệt độ thích hợp

    Có hại

- khi thời tiết nắng nóng , các thanh sắt của đường ray dãn nở là đường ray bị cong lệch là nguy cơ dẫn đến tai nạn

- khi rót nước nóng và cốc vì nức nóng là chất lỏng dãn nở nhanh hơn chất rắn là thủy tinh(cốc) nên cốc có thể bị vỡ

- khi thời tiết nắng nóng không khí dãn nở rất nhanh nên khi bơm lốp xe quá căng không khí ko có chỗ để dãn nở nữa nên lốp xe có thể bị nổ   

Câu hỏi trong lớp Xem thêm

I. Circle the correct one. “Too or Enough” 1) This car is too/enough old. We cannot go anywhere. 2) This book is too/enough thick for me to read. 3) That dress is cheap too/enough to buy. 4) This question is too/enough complicated to answer. 5) Everybody is too/enough excited about the holiday to focus on their work. 6) I can join that club. I’m young too/enough. 7) She can’t come with us to the bar. She’s too/enough young. 8) We have too/enough eggs to make a cake. 9) Do we have too/enough time to catch the bus? 10)This boy is too/enough noisy. I can’t study! 11)Mary’s room is too/enough dirty. Her mom is angry. 12)Tom is tall too/enough to join a basketball team. 13)This bag is too/enough heavy. I can’t carry it. II. Complete with “too” or “enough”. 1- She is clever ........................ to pass the test. 2- The skirt is ........................ long for you. 3- Kate is .......................young to drive a car. 4- There is ......................... meat in the fridge for the whole week. 5- I didn’t work hard ........................ to pass the exam. 6- We can’t buy the car because it is .......................expensive. 7- He can’t sleep because he drinks .......................much coffee. 8- Are you tall ...................... to reach that shelf? 9- They often take the bus to school because it’s ................... far to walk. 10- She isn’t fast ...................... to win the race. 11- There’s .......................food for everyone to eat. 12- She isn’t speaking clearly ................for me to understand. III. Complete the sentences with “too – enough” by using the words given. 1) I don’t want to eat that soup. It is _______________________. ( cold ) 2) She can’t come to party with us. She isn’t _______________________. ( old ) 3) They need much money. That car is _______________________ to buy. ( expensive ) 4) We don’t need to worry about the food. It is _______________________. (fresh ) 5) I missed the bus because I got up _______________________. ( late ) 6) I cannot buy that dress. It isn’t _______________________ for me to buy. ( cheap ) 7) I cannot climb that mountain. It is _______________________. ( high ) 8) You should help your sister. She is _______________________ to eat herself. (young) 9) It is _______________________ to see the way. ( foggy ) 10) He is _______________________ to win the race. ( fast ) 11) He is _______________________ to be the headmaster. ( qualified ) 12) Don’t want any help from him. He is _____________________ to help anyone. (rude) 13) The movie was _______________________. I couldn’t watch it. ( boring ) 14) Ben is _______________________ to solve the problems. He never studies. ( lazy ) 15) The questions were _______________________ to solve. ( difficult ) 16) Jeremy is _______________________ to talk people. ( shy ) 17) Ashley is _______________________ to pass the test. ( hardworking ) 18) I can’t wear this t-shirt. It is _______________________. ( small ) Giúp mk vs, tuy ns dài nhưg rấc cần sự giúp đỡ! Mk cần 2 bn lm ạ, bn nào có sức thì làm 2 bài, còn bn còn lại lm 1 bài a

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