user-avatar
lequangthu2610
2 năm trước
khi kéo 10 viên gạch lên cao bằng một ròng rọc cố định thì cần phải tác dng vào đầu dây một lực có độ lớn bằng bao nhiêu ? biết khối lượng mỗi viên gạch và thùng đựng là 1,5 kg và 1kg ( vẽ hình minh hoạ)
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

II. Read the paragraph and answer the questions below. The Kiwi The Kiwi lives only in New Zealand. It is a very strange bird because it cannot fly. The kiwi is the same size as a chicken. It has no wings or tail. It does not have any feathers like other birds. It has hair on its body. Each foot has four toes. Its beak (mouth) is very long. A Kiwi likes lot of trees around it. It sleeps during the day because the sunlight hurts its eyes. I can smell things with its nose. It is the only bird in the world that can smell things. The kiwi’s eggs are very big. There are only a few kiwis in New Zealand now. People never see them. The government says that people cannot kill kiwis. New Zealanders want their kiwis to live. There is a picture of a kiwi on New Zealand money. People from New Zealand are sometimes called kiwis. Questions Write T if the sentence is true. Write F if it is not true. 1. Kiwi live in Australia and New Zealand. 2. A kiwi has a tail but no wings. 3. A kiwi has a big beak. 4. It sleeps during the day because light hurts its eyes. 5. The New Zealand government does not want all the kiwis to die. 6. A kiwi is like most other birds.

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