какова первая космическая скорость для планеты радиусом 4000 км если ускорение свободного падения у ее поверхности 6 м/c

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Dear Ivan

Thank you for your letter. We are very happy that you are coming to stay with us in August, and we are sure you'll have a good time. What time are you arriving at Gatwick airport? You can get a train to Brighton from there. Do you have mobile phone? Then you can phone us when you are on the train, and we'll meet you at the station. Could you also tell me a few more things about yourself? Is there anything you can't eat or drink?Do you smoke? Do you want a single room,or Do you prefer to share a room with another student?Are you going to go back to Russia immediately after the end of the course? If not, how many more days are you going to stay with us?

Jane Sanders

ребяяяят, помогите пожалуйста, "Чем потрясает последняя встреча Тараса с Остапом?" Гоголь. "Тарас Бульба"

Найдите значение переменной 31x меньше 65x на 102

При каком значении P решением уравнения

px - 3py + 6 = 0

Является пара чисел (1,5;-1,5)