user-avatar
banngoc
2 năm trước
2 con lắc đơn có l1 = 25 ( cm ) , l2 = 64 (cm). Đang dđđh trong 2mp song song với nhau vào thời điểm t=0 thì cả 2 con lắc đi qua VTCB theo chiều dương của trục , khoảng thời gian ngắn nhất để hiện tượng đó lại xảy ra là? ( g=10m/s^2)
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

12. The eyewitness gave an accurate (describe) ________of the bank robber. * 13. For (add)________information on flight times and package holidays, contact your travel agent. * 14. My brother is nothing but a computer-games (enthusiasm) ________. He's always playing days and nights. 15. This kind of aspirin is (solve) ________ and easy to be absorbed. Remember to take it with plenty of water. 16. He seemed like a quiet, (offend)_________ sort of a guy. 17. Lions live in groups called prides. The lioness is (true) ________ amazing. * 18. The females will hunt and look after her young for 2 years before they become (depend) _________. * 19. It's 1.00 a.m and the usually busy street was now quiet and (desert)________. 20. The mirrors made the room look bigger, but in (real) ________ it was quite small.

Ex 5. Put the verbs in brackets into the correct tense or form. 1. If we __________ (not stop) cutting down so many trees, we’ll endanger our oxygen supply. 2. Last year Mr. Johnson _____________ (teach) us Robotics. 3. My sister is really busy – she _____________ (study) for the exam. 4. In the future, robots _____________ (do) things that people can’t do or don’t want to do. 5. Mark _____________ (be) to Sa Pa twice. The first time _____________ (be) more than ten years ago. 6. How often _____________ (you/ do) household chores? ~ Every day. 7. Twenty years ago, most people around the world _____________ (not know) what the Internet was. 8. If we dump all sorts of chemicals into rivers, we _____________ (not be able to) swim in them in the future. Ex 6. Supply the correct form of the words in brackets. 1. The smartphone is one of the most useful _____________ devices. (wire) 2. Solar panels take energy from the sun to produce _____________. (electric) 3. Household waste ____________ the environment when not disposed of properly. (pollution) 4. More and more companies are making products from _____________ materials. (recycle) 5. _____________ water bottles reduce plastic waste and contribute to saving the environment. (reuse) 6. The International Robot _____________ is the largest robot trade fair in the world. (exhibit) 7. Robotics helps to make work and your life _____________. (easy) 8. Robots don’t have the _____________ to think about their action before they act. (able) Ex 7. There is one mistake in each sentence. Find and correct it. 1. In the future, robots will do all the housework instead us. 2. I’m sorry I won’t able to go to your party on Friday. 3. I can write with my right hand. I’m left-handed. 4. Using a lot of plastic bags are bad for the environment. 5. If we will go shopping tomorrow, I’ll buy some reusable shopping bags. 6. Some people believe that robots will play a important role in our lives. Ex 8. Match the sentences. 1. If we don’t do something to stop pollution, a. if we don’t cut down on waste rapidly. 2. I would love a self-cleaning house b. if you switch off your TV when you’re not watching. 3. Smart refrigerators will help reduce waste c. that could cook all my meals for me. 4. Pepper is a Japanese humanoid robot d. that does all the housework for me. 5. You will save electricity e. that can sense emotion and exhibit its own feelings. 6. Robots won’t replace teachers in the classroom f. by letting you know when the food in your fridge are about to go bad. 7. We’ll threaten our own existence g. we may kill most of the life forms living on our planet today. 8. I’d like a robot chef . h. because they can’t inspire

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