Tìm hiểu về lực? a, Dùng tay để thực hiện: Các lần làm Nhận xét lực mà tay ta tác dụng vào lò xo Kéo dãn lò xo Nén lò xo Uốn cong lò xo Có nhận xét gì về lực mà tay tác dụng vào lò xo trong các trường hợp rên? b, Nếu muốn làm lò xo dãn hoặc nén càng nhiều thì lực mà tay ta tác dụng lên lò xo sẽ cần như thế nào?

2 câu trả lời

a. kéo dãn lò xo cần nhiề lực nhất

b. cần tác dụng lực mạnh thêm

 

Đáp án:

 

Giải thích các bước giải:

a, keo dan lo xo dung nhieu luc nhat

b, dung luc manh them

Câu hỏi trong lớp Xem thêm

1. Chọn đáp án thích hợp nhất (A, B, C hoặc D) để hoàn thành mỗi câu sau

11. Jane never stays up late but Bill……………….

A. does B. doesn’t C. is D. are

12. Bill: “What a lovely house you have!” John: “………………”

A. No problem! B. I think so C. That’s right D. Thanks. Hope you’ll drop in

13. This papaya is green. It is not ………………..

A. cooked B. yellow C. good D. ripe

14. There is a ………………. behind my house.

A. big beautiful flower garden B. garden flower big beautiful

C. beautiful big flower garden D. big beautiful garden flower

15. Some people play video games at home. ……………….. play them in arcades.

A. Other B. Others C. Another D. Each other

16. What ……………….. awful weather! It’s so cold and wet.

A. a B. an C. the D. 

17. My tooth doesn’t stop hurting. I’ll go and see the ………………..

A. doctor B. teacher C. dentist D. actor

18. I …………… it difficult to learn English well.

A. make B. find C. feel D. get

19. A friend of ……………….. is going to visit me next week.

A. my B. I C. mine D. me

20. Many people can write poems, but only ……………….. can be

come good poets.

A. afew B. few C. a little D. little

21. Washington D.C is ………………. capital of ………………. United States.

A., the B. the,  C. the, the D. , 

22. Marie Curie learnt to read and wrtie ................................. she was four years old.

A. while B. as soon soon C. when D. why

23. The shirts here are ................................. more expensive than those at the bookshop on the corner.

A. very B. quite C. extremely D. much

24. ................................. ruler is this? Mine or yours?

A. Who’s B. Whose C. Who D. Which

25. We can learn more about the undersea world ................................ Costeau’s invention of the diving vessel.

A. because B. because of C. thanks to D. thanks for

GIÚP MIK MIK SẼ VOTE 5 SAO VÀ CHO HAY NHẤT CHO BẠN LM ĐẦU TIÊN

3 lượt xem
1 đáp án
15 giờ trước

VII. Read the passage. Then answer the questions. (1.0 point) Mai and Hoa are students. They live in Viet Nam. There are four seasons in a year in their country. They are spring, summer, fall and winter. In the spring, the weather is usually warm. Sometimes it is cold, but not very cold. There are many flowers in this season. After spring, it is the summer. In the summer, the days are long and the nights are short. They often go on vacation in the summer. Fall is a nice season. The weather is often cool. In the winter, it is usually very cold. The days are short and the nights are long. They always wear warm clothes in the winter. Questions: 1. How many seasons are there in their country? What are they? =>……………..……………………………………………………………………………………… 2. What is the weather like in the spring? =>………………..…………………………………………………………………………………… 3. What do they often do in the summer? =>…………………..………………………………………………………………………………… 4. Are the days long or short in the winter? =>………………..…………………………………………………………………………………… 5. Why do they always wear warm clothes in the winter? =>………………..……………………………………………………………………………………

3 lượt xem
2 đáp án
16 giờ trước