The document contains two physics problems involving coefficients of friction and centripetal force calculations. It also includes questions about electrification and electricity. The problems are: 1) A car needs a coefficient of friction of at least 0.33 to safely round a curve of radius 70 m at a speed of 55 km/h. 2) A 25 kg child on a merry-go-round 7 m from the center experiences a centripetal acceleration of 0.32 m/s^2 and a horizontal force of 8 N.

1. THE TASKS З А Д А Ч И

4. РЕШЕНИЕ: О т в е т: коэффициент трения должен быть равен не менее 0,33.

6. РЕШЕНИЕ: О т в е т: Центростремительное ускорение 0,32 м/с2 ; результирующая горизонтальная сила 8 Н.

7. QUESTIONS

12. WHAT IS MISSING ?

13. WHERE IS MISTAKE?

14. WHAT IS WRONG ?

15. CROSSWORD К р о с с в о р д

16. CROSSWORD BACKWARD