Mọi người giúp dùm với ạ !!! Bài : Một vật nhỏ khối lượng 100g treo vào sợi dây có chiều dài 1m, kéo vật sao cho dây treo hợp vs phương thẳng đứng 1 góc 60độ rồi thả nhẹ. Xác định : a) Cơ năng của vật? b) Vận tốc của vật khi qua vị trí cân bằng ? c) Thế năng của vật khi dây treo lệch gốc 20độ d) Động năng của vật khi dây treo lệch gốc 30độ ? Em cảm ơn trước ạ ~~~ <3

Viết một đoạn văn quy nạp từ 6-8 câu nói về mục đích học tập của người học sinh (có sử dụng phép liên kết)

Question V. Find the word which has different stress pattern from the others. 1. A. artistic B. historic C. dramatic D. scientific 2. A. medical B. national C. chemical D. historical 3.A. athletic B. dramatic C. scientific D. heroic 4.A. medical B. hospital C. politic D. electric 5.A. chemical B. physical C. environmental D. medical

viết một đoạn văn khoảng 200 từ nói về tầm quan trọng của học vấn

em hãy nói rõ nền nồng nghiệp đã phát triễn mạnh nhờ những điều kiện nào

bình có 78 viên kẹo bình cho đaò một số viên kẹo bình còn lại 52 viên . Hỏi bình đã cho đào bao nhiêu viên kẹo

36. Since I have heard nothing from him. A. he had left B. he left C. he has left D. he was left 37. I like looking at these pictures, but I _ enough by lunch time. A. should have B. will have C. will have had D. have 38. “Are you ready, Ann?” “Yes, I ”. A. am coming B. come C. came D. have came 39. Why at me like that? What’s the matter? A. do you look B. have you looked C. did you look D. are you looking 40. I don’t understand this sentence. What ? A. does mean this word B. have this word mean C. means this word D. does this word mean 41. It was noisy next door. Our neighbors a party. A. had B. were having C. had had D. have had 42. It dark. Shall I turn on the light? A. is getting B. get C. got D. has got 43. I along the street when I suddenly heard footsteps behind me. A. was walking B. am walking C. walk D. walked 44. When I last Jane, she to find a job. A. see/was trying B. saw/was trying C. have seen/tried D. saw/tried 45. Look! That man to open the door of your car. A. try B. tried C. is trying D. has tried 46. When I was young, I to be a singer. A. want B. was wanting C. wanted D. had wanted 47. It is a nice day. I we go out for a walk. A. suggested B. suggest C. is suggesting D. are suggesting 48. I the dishwasher on when heard the shot. A. am turning B. was turning C. was turning D. turned 49. There was a time when watching TV really family entertainment. A. were B. was C. had been D. is 50. At last the bus came. We for half an hour. A. waited B. was waiting C. have waited D. had been waiting 51. When the first child was born, they married for three years. A. have been married B. had been married C. will been married D. will have been married 52. I think the weather _ nice later. A. will be B. be C. had D. has been 53. She very angry when she knows this. A. shall be B. has been C. will have been D. will be 54. I’m going on holiday on Saturday. This time next week I on a beach in the sea. A. will lie B. am lying C. will be lying D. should be lying 55. my wallet anywhere? I can’t find it. A. Did you see B. Have you seen C. Do you see D. Had you seen 56. How do you do, Sarah? Are you back from the conference? it? A. Did you enjoy B. Have you enjoyed C. Are you enjoying D. Do you enjoy 57. Sorry, could you say that again please? I to you? A. haven’t listened B. hadn’t listened C. didn’t listen D. am not listening 58. I’m sorry I to you for so long, but I’m very busy lately. A. haven’t written B. am not writing C. don’t write D. didn’t write 59. I’m pretty sure that we the exam. A. will pass B. haven’t passed C. have passed D. are going to pass 60. It's amazing how Jenny acts as though she and Darren serious problems at the moment. A. aren’t having B. weren’t having C. hadn’t had D. hadn’t been having 61. By the age of ten, Helen Braille as well as the manual alphabet and even learned to use typewriter. A. mastered B. has mastered C. had mastered D. was mastering 62. The teacher as well as his students at the school meeting yet. A. arrived B. hasn’t arrived C. haven’t arrived D. not 63. Every evening since last Christmas, I __my dog out of for a walk in the park. A. take B. took C. have taken D. had taken 64. After John a rough outline of the model, he will begin painting. A. had drawn B. has drawn C. drew D. draw 65. I the bell three times when he answered the door. A. would ring B. rang C. had rung D. was ringing 66. It is necessary that I here tomorrow. A. would be B. were C. am being D. be 67. Since I a child, I have solved difficult Math puzzles. A. am B. was C. have been D. had been 68. This time next month we won’t be at work; we the peaceful atmosphere of the countryside. A. will enjoy B. will have enjoyed C. are enjoying D. will be enjoying 69. A number of prisoners on the occasion of the Independence Day this year. A. has been released B. have been released C. were released D. was released 70. Ian a shower at the moment, so could you call back in about half an hour? A. takes B. is taking C. has taken D. has been taking

Các bạn giúp mình làm bài 1 và câu e bài 3.

trên lông dưới lông dưới lòng làm một chỉ cái gì

Một người mua hai loại hàng và phải trả tổng cộng 1,64 triệu đồng, bao gồm 0,14 triệu đồng tiền thuế. Biết rằng thuế là 8% đối với loại hàng thứ nhất và 10% đối với loại hàng thứ hai. Hỏi nếu không kể thuế thì người đó phải trả bao nhiêu tiền cho mỗi loại hàng? Trả lời: không kể thuế, người đó phải trả triệu đồng cho loại hàng thứ nhất, triệu đồng cho mỗi loại hàng