Câu 1 : Tại sao khi bị hơ nóng, quả cầu không lọt qua vòng kim loại? ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Câu 2 : Tại sao sau khi được nhúng vào nước lạnh, quả cầu lại lọt qua vòng kim loại? ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ ............................................................................................................................................ Câu 3 : Cho độ tăng chiều dài của các thanh kim loại khác nhau có chiều dài ban đầu là 100cm khi nhiệt độ tăng thêm 500C Nhôm 0,12cm Đồng 0,086cm Sắt 0,060cm Em hãy rút ra nhận xét sự nở vì nhiệt của các chất rắn khác nhau?

2 câu trả lời

Câu 1

Khi bị hơ nóng, quả cầu  nở ra nên không lọt qua vòng kim loại.

Câu 2

Khi được nhúng vào nước lạnh, quả cầu co lại nên lọt qua vòng kim loại.

Câu 3

-Nhôm nở nhiều nhất

-Đồng nở ít hơn nhôm

-Sắt nở ít nhất

Trả lời:

Câu 1: Vì khi hơ nóng, quả cầu nở ra to hơn vì nhiệt nên không lọt qua vòng kim loại

Câu 2: Vì khi nhúng nước, quả cầu co lại nhỏ hơn nên lọt được qua vòng kim loại

Câu 3: Sắt nở vì nhiệt ít hơn, nhôm nở vì nhiệt nhiều hơn, đồng nở vì nhiệt nhiều hơn sắt và ít hơn nhôm

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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