Вопрос школьника по предмету Физика
самолет совершает мертвую петлю. Чему равен радиус петли, если летчик в верхней точке петли оказывался в состоянии невесомости при скорости 100 м/с
Ответ учителя по предмету Физика
В верхней точке петли кинетическая энергия тела переходит в потенциальную. Кинетическая энергия тела массы m и движущегося со скоростью v равна 0,5*m*v². Потенциальная энергия равна 2*m*g*R, где R-радиус петли. Приравниваем 0,5*m*v²=2*m*g*R⇒m*v²=4*m*g*R⇒R=v²/(4*g)=100²/(4*9,81)=254,842 метра.
Ответ: 254,842 метра.
Похожие вопросы от пользователей
1.If everything (go) well, we (meet) soon. 2. I don’t know where I (have) a rest next summer. 3. If she (want) it, she (get) it.
4.We (try) to get the money before the bank (close). 5. If she (keep) to a diet, she (feel) very well. 6. I not (speak) to him unless he (apologize). 7. If it not (rain) on the weekend, we (paint) the bench in the garden. 8. We (have) to leave the place before the sun (rise). 9. We (know) his new address as soon as he (e-mail)us. 10. I (stay) with you till the doctor (come). 11. If the film (finish) late, the child not (able) to fall asleep. 12. In case the plan not (work), we (think) of something else. 13. If the price (go) down, I (buy) a new computer. 14. We (try) to run away before the police (come). 15. If she (learn) the truth, she (be) very unhappy. 16. If the ecological situation (improve), people (feel) much better. 17. I (have) to tell my parents the truth before my teacher (call) them. 18. If there (be) a lot of snow in the forest, we (go) skiing. 19. As soon as he (get) the contracts, he (fax) them to you. 20. She (start) a new life after she (graduate) from University.
90 баллов.Срочно!За спам БАН!