Предмет: Физика, автор: агентик

предмет,находящийся на расстоянии d=15 см от собирающей линзы,движется параллельно плоскости линзы и перпендикулярно главной оптической оси со скоростью v=3 м\с. определите скорость движения предмета относительно его действительного изображения на экране, если экран расположен на расстоянии f=45см от линзы. Помогите плз

Ответы

Автор ответа: MashaPutnaj
13
дано d=15 см    f=45 см     V1=3 м/с

Г=f/d=H/h      H=V2*t      h=V1*t
f/d=V2/V1
V2=V1*f/d=3*45/15=9 м/с
если тело движется относительно оптической оси вверх то изображение двигается вниз

Vотн=V2 -(-V1)=9+3=12 м/с

mteremizova: http://znanija.com/task/12283967
Интересные вопросы
Предмет: Английский язык, автор: akivoim
Раскройте скобки, употребляя глаголы в одном из следующих времен: Present Continuous, Present Simple, Past Simple или Future Simple. 1. I (to think) Nellie (to leave) for Moscow tomor­row. 2. I (to be) in a hurry. My friends (to wait) for me. 3. You (to be) at the theatre yesterday. You (to like) the opera? — Oh yes, I (to enjoy) it greatly. 4. We (to expect) you (to go) to London next sum­mer. 5. Her English (not to be) excellent, but she (to work) at it. 6. A week ago they (not to know) what to think. 7. She (to worry) a lot at the moment, but the problems (not to be) very great. 8. Last Tuesday he (to be) upset and (to have) no idea where to go. 9. Could you tell me the way to Trafalgar Square? I (to go) the right way? 10. Various kinds of sports (to be) popular in Russia. 11. Both children and grown-ups (to be) fond of sports. 12. What (to be) the matter with her? She (to be) so excited. — I (not to know). 13. Where you (to go)? — I (to go) to the stadium to see the match which (to take) place there today. 14. You (to know) that a very interesting match (to take) place last Sunday? 15. He (to go) to the south a week ago. 16. When I (to be) about fifteen years old, I (to enjoy) playing football. 17. Our foot­ball team (to win) many games last year. 18. Where (to be) Boris? — He (to play) chess with his friend. 19. I (to be) sorry I (to miss) the match yesterday. But I (to know) the score. It (to be) 4 to 2 in favour of the Russian team.
Предмет: Математика, автор: oksdzal75