user-avatar
duongthienloc040399
2 năm trước
Câu 1:một quả bưởi có khối lượng 2kg rơi thẳng đứng từ độ cao 5m xuống đất: a)Lực nào có thực hiện công cơ học?Tính công của lực này? b)Một làn gió thổi theo phương song song với mặt đất có cường độ 150N tác dụng vào quả bưởi đang rơi .Tính công của gió tác dụng vào quả bưởi? GIÚP MÌNH VS Ạ=))
Thích Trả lời Chia sẻ

Các câu hỏi liên quan

Giúp mình giải với !!! Có mỗi trắc nghiệm thôi ạ !!! Vote cho 5 sao nè !!! Choose the option A, B, C or D that best fits the blank space in the following passage. London’s Tower Bridge is one of the most famous (1) ___ in the world. The bridge, designed by the architect Horace Jones together with John Wolfe Barry, was finally completed in 1894. It (2)___ 11,000 tons of steel to build the framework of the 265-meter-long bridge. Over time, the bridge has become one of London’s most famous symbols.(3)___ photographs of the Tower Bridge is a favourite London tourist activity, but you can also go inside the bridge, where you’ll have a magnificent view over London from the walkway between the two bridge towers.In 2014, glass floors (4)____ in the walkways, giving visitors another, unusual view from the bridge. The long glass floors, more than 40 meters above the river, allow you to watch the traffic over the Tower Bridge from above. It is particularly (5) ___to see the bridge open and close below your feet. 1. * 1 điểm bridge towers bridges tower 2. * 1 điểm gave brought built took 3. * 1 điểm To take Taking To taking Take 4. * 1 điểm will be installed installed were are installed 5. * 1 điểm fascinating fascinate fascination fascinated Choose the correct option A, B, C, or D to complete the sentences. 6. Singapore is famous for its ___ and green trees. * 1 điểm cleanly cleaning clean cleanliness 7. On Christmas Eve, most big cities, especially London are ___ withcolored lights across the streets and enormous Christmas trees. * 1 điểm hang decorated made put 8. In the United States there are 50 ___ and six different time zones acrossthe country * 1 điểm nations towns countries states 9. I once tried to ___ apple pie when I was in London. It was really delicious. * 1 điểm make show cook do 10. You should go to Canada in summer because it is the most popular time for visitors to ___ Niagara Falls and see the beautiful sights there. * 1 điểm look stay visit tour 11. Nowadays you still see the ___ men where kilts (skirts) to wedding or other formal occasions. * 1 điểm Scottish Scots Scotland Scot 12. The USA has a population of about 304 million, and it is the third ___ country in the world * 1 điểm smallest highest largest narrowest 13. In some English speaking countries, turkey and pudding are ___ food atChristmas. * 1 điểm national historical traditional possible 14. New Zealand ___ lovers of nature and fans of dangerous sports. * 1 điểm asks attracts calls keeps 15. Queenstown in New Zealand has got beautiful ___ and a dry climate, so it's ideal for outdoor activities. * 1 điểm atmosphere viewing look scenery

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