Предмет: Физика, автор: 1234567890ddffrgfyge

Тонкий цилиндрический стакан наполнен водой. Используя линейку и миллиметровую бумагу, определите вес воды

Ответы

Автор ответа: 111ig111
4
Нужно замерить внутренний диаметр стакана для определения площади цилиндра.   S=π*(D/2)^2
Затем замеряем высоту воды в стакане ,чтоб найти h и вычислить объем воды V=S*h
Затем находим из справочника плотность воды q=1000кг/м^3
И найдем массу 
m=q*V=q*π*(D/2)^2
Вес воды найдем P=m*g=m*q*π*(D/2)^2  где g ускорение свободного падения = 10м/с^2
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Test 2
Variant 1

Name:__________________________ Class: _________ Date: _______________
А

Fill in the correct word: teaspoons, opposite, grated, overcooked, portions, nursery, grilled, preheat, piece, pinch

1.This restaurant serves very small _______________ . 2.I’m hungry after I leave it!
3.I’d like two _______________ of sugar in my tea, please!
4.My mum is making pizza. We need some _______________ cheese.
5._______________ chicken is my favourite dish!
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7.The test is very easy. It was a _______________ of cake.
8.You should add another _______________ of pepper to the sauce.
9.Bill likes sharing his food with other little children at the _______________ school.
10.Where’s the chemist’s? - _______________ the supermarket.
11._______________ the oven to 190 °C and bake cherry cake for 50 minutes.
В

Complete the sentences with the words derived from the words in bold.
1.She has a very strong _____________ of coffee. She drinks tea. (like)
2.Her name is very difficult and most people ___________ it when they write it down. (spell)
3.I’ve had a ____________ with my History teacher. (understanding)
4.Mary is polite and never shows _____________ to others. (respect)
5.What are the _____________ of living in a big city?(advantages)
С

Fill in the gaps with the correct form of the verbs in brackets.
The police 1.____________________ (go) after a robber for over an hour.
2.We __________never______________(buy) things at the flea market.
3.The waiters ________already____________ (serve) steamed fish.
4.Vegetables ____________________ (boil) for 30 minutes.
5.We____________________ (try) to find tickets for the concert for three weeks.
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8.You look tired! __________you ________________ (work) all day?
9.I _______________________ (not / eat) Chinese food yet.
10.How long _______ you ________________(study) English?
11.How many souvenirs you ________ your sister ______________(buy) in Spain?
12.I _______________________ (not / see) Tina for ages.
13.I ____________________(know) Mrs Brown for twenty years now.
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D

Complete the phrasal verbs with the right pre"Times New Roman, serif">down with, off, without, up, with, after, through
1.Mary went _______ the flu yesterday and she stayed at home.
2.Boys have gone _______ the kitten and caught it.
3.Don’t use this cheese! It’s gone _______ .
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