# Chap1 - 14 Strategy Follow the rules for identifying...

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14. Strategy Follow the rules for identifying significant figures. Solution (a) All three digits are significant, so 7.68 g has 3 significant figures. (b) The first zero is not significant, since it is used only to place the decimal point. The digits 4 and 2 are significant, as is the final zero, so 0.420 kg has 3 significant figures. (c) The first two zeros are not significant, since they are used only to place the decimal point. The digits 7 and 3 are significant, so 0.073 m has 2 significant figures. (d) All three digits are significant, so 5 7.68 10 g × has 3 significant figures. (e) The zero is significant, since it comes after the decimal point. The digits 4 and 2 are significant as well, so 3 4.20 10 kg × has 3 significant figures. (f) Both 7 and 3 are significant, so 2 7.3 10 m × has 2 significant figures. (g) Both 2 and 3 are significant. The two zeros are significant as well, since they come after the decimal point, so 4 2.300 10 s × has 4 significant figures.

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