Начальные данные: m1 (масса машины) = 1200 кг; V1 (скорость движения машины) = 120 км/ч; m2 (масса мухи, которая летит на встречу машине) = 1 г (10-3 кг).
Для остановки мухой машины должно выполняться условие: m1 * V1 = m2 * V2, откуда V2 = m1 * V1 / m2.
Вычисление: V2 = 1200 * 120 / 10-3 = 144000000 км/ч = 144 * 106 км/ч.
Ответ: Для остановки машины муха должна лететь со скоростью 144 * 106 км/ч.
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II. Fill in the correct word (Вставь нужное слово)
• music • aspirin • buy • clothes • pair • fast • floors • florist’s • games
1. The ………. shop has got the skirt I like.
2. What do you want to ………. ?
3. You will find ………. at the chemist’s.
4. I’m hungry. Let’s eat at the ………. food restaurant.
5. I need some flowers. Where's the ………. ?
6. I want to buy a ………. of shoes.
7. This supermarket has two ......... .
8. You can find .......... at Toyland.
9. A new CD is at the ......... shop.
III. Write in must or mustn't (Вставь must или mustn't)
1. Stop watching TV. You_______ do your homework.
2. I_______brush my teeth.
3. Your shoes are dirty. You _______clean them.
4. You _______go to school every day.
5. I _______tidy my room.
6. You _______play on the road.
IV. Put the verbs into the Past Simple.
1. He ______(eat) a sandwich for lunch yesterday.
2. Mum _________(buy) a new toy car tor for her son.
3. ____ you _________(drink) tea in the morning?
4. I _________ (not take) a book.
5. They ________(come) home late.
6. The boys _______ (play) football 2 days ago.
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