Exercises
2.14. Measure the height of a cabinet with a ruler or roulette and write the result of your measurement.
2.15. Transforms:
a) 0,07 km = ? m
b) 870 mg = ? g
c) 0,4 cs = ? s
2.16. What physical phenomena are shown in the following images (fill in the blanks) ?
2.17. Which of the following statements are true or false and why?
a) 278 mm > 27,8 cm
b) 0,066 km = 66 m
c) 0,45 hm ≤ 7,9 dam
d) 562 dam ≥ 3495 dm
2.18. According to the experimental problem called "Determining the actual length of a body", determines the width of the physics book.
2.19. Mary measured the diameter of the mouth of her favorite glass and found the values: 6,5 cm; 6,4 cm; 6,6 cm; 6,3 cm; 5,2 cm; 6,9 cm.
Use these values and determine the actual size of the glass diameter.
2.20. Determine the areas of the three surfaces of the physics textbook by measuring its length, width, and height.
2.21. Transforms:
a) 520 cm2 = ? m2
b) 4,9 dam2 = ? m2
2.22. Determine the area of the following contour:
2.23. A cube has a side of 5 dm, and a parallelepiped has the following dimensions 800 mm; 0,04 hm and 0,3 dam. Which of the two bodies has the largest volume?
2.24. Transform into m3:
a) 4.800 dm3 = ? m3
b) 0,06 hm3 = ? m3
c) 53.000 mm3 = ? m3
2.25. Which of the following statements are true and false, respectively, and why?
a) 650 cs = 6,5 s
b) 1h 5min 40s > 80min 50s
c) 5zile 3h 30min 20s < 4zile 25h 10min 10s
d) 4,6hs =460s
2.26. Julia left home at 7:20 and arrived at school at 7:50. Knowing that she had 6 hours of class, every hour of 50 minutes with a break of 10 minutes and that on the way back she did 15 minutes more than on arrival, at what time did Julia get home?
2.27. Michael performed the experiment no. 4 to measure the oscillation period of a pendulum. He timed the time in which the pendulum made 10 oscillations each time and noted them in the following table:
Calculate the real value of the pendulum period in Michael's experiment.