Предмет: Физика, автор: pearl7

Яка сила взаємного притягання двох тіл масами по 100 тцентри мас яких знаходяться на відстані 40 м?

Ответы

Автор ответа: EkZO29
0

F=Gfrac{m1m2}{R^{2}}

m1=m2

F=Gfrac{2m^{2}}{R^{2}}

F=frac{6,67cdot2cdot10^{-6}}{16cdot10^{2}}=0,83cdot10^{-8}Н

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Exercise 2. Look through the text «Travelling» again and choose the sentences which correspond to the text from the selection below.
1. Nora got out of the taxi and called a porter.
2. Harris and his wife were standing on the platform when their friend came up to them.
3. They came into their compartment and found their berths.
4. George told that the thing was to book tickets beforehand.
5. George reserved a separate first-class cabin and then packed the luggage.
6. The sea was rather calm, so George and Nancy were not afraid of being sea-sick.
7. Andrew Milton thought that it wouldn't be difficult to get a ticket at the airport.
8. In the afternoon Andrew took a special express coach and came to the airport in twenty minutes.
9. Andrew was sitting in the departure lounge when he heard the announcement.
Exercise 3. Complete the following sentences according to the content of the text.
1. Nora's uncle lived in Torby so she...
2. Nora wanted to order lunch so she...
3. When Harris and Nancy arrived at the harbour they saw...
4. It was difficult for them to find their cabin so...
5. Andrew was warned by the clerk that...
6. Andrew's carry on luggage was inspected because of...
Exercise 4. Answer the following questions. Choose the right variant.

1. How did Andrew get to the country he has chosen for his holidays?
a. by train
b. by plan.
c. on foot

2. Why did he decide to buy a ticket at the airport?
a. he hasn't booked a ticket beforehand.
b. he had no time to buy a ticket at the booking office in town.
c. it was much easier to get a ticket at the airport.

3. What did Angrew do just after his luggage had been weighed?
a. he paid extra
b. went to the department
c. began to read a fresh newspaper