user-avatar
TTTN29062008
2 năm trước
từ độ cao 10m người ta thả rơi 1 vật nặng 500g .bỏ qua sức cản không khí. lấy g=10m/s bình .chọn mốc thế năng tại gốc .tính cơ năng của vặt lúc bắt đầu rơi . tính vận tốc của vật lúc thế năng bằng động năng . tính vận tốc của vặt lúc chạm mốc
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Read the passage carefully, then choose the correct answers. The latest addiction to trap thousands of people is the Internet, which has been blamed for broken relationships, job losses, financial ruin, and even suicide. Psychologists now recognize Internet Addiction Syndrome (IAS) as a new illness that could cause serious problems and ruin many lives. IAS is similar to other problems like gambling, smoking and drinking: addicts have dreams about the Internet; they need to use it as the first thing in the morning; they lie to their parents and partners about how much time they spent online; they wish they could cut down, but are unable to do so. A recent study found that many users spend up to 40 hours a week on the Internet. Some of the addicts are teenagers who are already hooked on computer games and who find it very difficult to resist the games on the Internet. Which of the followings is NOT true? A: IAS is recognized as a new illness. B: Many Internet addicts spend more than 40 hours a week online. C: Teenagers who are hooked on computer games can suffer from IAS. D: Internet addiction can cause suicide behaviors.

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