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В решении.
Пошаговое объяснение:
Расстояние по трассе между двумя посёлками 1540 м. Из этих посёлков одновременно навстречу друг другу выехали два велосипедиста. Скорость первого равна 3 м/с, скорость второго 4 м/с. Какое расстояние будет между велосипедистами через 3 мин после начала движения? Через какое время после начала движения велосипедисты встретятся?
Формула движения: S=v*t
S - расстояние v - скорость t – время
3 минуты=60*3=180 секунд.
1)Найти расстояние 1 велосипедиста:
3*180=540 (м).
2)Найти расстояние 2 велосипедиста:
4*180=720 (м).
3)Какое расстояние будет между велосипедистами через 3 мин после начала движения?
1540 - (540+720)= 280 (м).
4)Через какое время после начала движения велосипедисты встретятся?
Общее расстояние 1540 м.
Общая скорость 3+4=7 (м/сек).
Общее время: 1540 : 7 = 220 (сек.)
При использовании карты следует учитывать, что местное время в Новосибирске отличается от зонального Московского времени, отсчитываемого от Гринвичского меридиана, в среднем на 2 часа 30 минут, а от местного зонального на 1 час 30 минут, к тому же, необходимо предупредить, что при построении картины звездного неба расчеты ведутся на основе времени установленного на Вашем устройстве.
На рисунке 1 представлены: зимнее звездное небо и область звезд, которые никогда не заходят на широте Новосибирска * . В этой области 5 созвездий, которые не выходят за пределы ее границ:
Малая Медведица; Дракон; Кассиопея; Жираф и Цефей - они называются незаходящими
Непосредственно к югу от незаходящих созвездий располагаются частично заходящие созвездия такие, что хотя бы одна их звезда попадает в приполярный круг незаходящих звезд.
На небе Новосибирска 16 частично заходящих созвездий (от линии отсчета по часовой стрелке):
1. Бол.Медведица;
2. Мал.Лев;
3. Гончие Псы;
4. Волопас;
5. Сев.Корона;
6. Геркулес;
7. Лира;
8. Лебедь;
9. Ящерица;
10. Андромеда;
11. Пегас;
12. Персей;
13. Треугольник;
14. Возничий;
15. Близнецы;
16. Рысь.