человек безит со скоростью 5м/сотносительно палубы теплохода в направлении, в противоположном направлении теплохода. скорость теплохода равна 54 км/ч.определить скорость человека относительно пристани

 

 

Прочитайте текст. Поставьте глаголы, данные в скобках после цифр 18—22, в нужную форму и заполните пропуски. The morning was nice and clear, and it was Sunday. I ______________ 18 (not/have to) go to the university and planned to sleep a bit longer. I was dreaming about a nice late breakfast when my little brother rushed into the room. "Are you sleeping? Don't you remember that we are going to the Zoo today?" He was right - I_________________19 (promise) him that. "It's still too early," I tried to protest. "The animals ______________ 20 (not/have breakfast) yet..." My brother cast a quick look on me, "Then we need to hurry. I want to see them having their breakfast." I had no choice and in forty min¬utes we were in the Zoo. My little brother __________________ 21 (disappoint). By that time the bear had had his breakfast. It ______________ 22 (sleep) in the corner of his open-air cage and paid no attention to little visitors.

для сохранения древесины от гниения используют цинк хлорид. вычислите количество вещества (моль), если известно, что число молекул этого соединения равна 12,04 * 10 в 23 степени