131
Figure 2
а
Figure 2 b
After several rotations of the yarn breaks, when the ball is in the position Q (Fig.
3). Which figure shows the direction in which the ball
will fly at the time of
separation?
Figure 3
Task 12.
In XX century songs about cars and it was a lot fashionable. Here is one:
Cars, cars
Virtually all flooded.
Where the age-old dust,
His car left the track ...
Or
Somewhere outside the city
Very inexpensive
Dad bought the car ...
Question. Prove that in any song, which refers
to the car, we are talking about
physical phenomena and chemical phenomena.
Task 13. Balloon
Balloon inflated after the occurrence of the interaction of sodium
hydrogencarbonate and vinegar (Fig. 4).
132
Figure 4
Question. Why inflated balloon?
Task 14. Waste
Waste of these materials buried in the ground.
Question. Which of these materials be destroyed rather than others?
A. Steel.
B. Plastics.
C. Glass.
D. Paper.
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