Significant figures, approximate numbers, etc. How many significant figures? a.

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Significant figures, approximate numbers, etc. How many significant figures? a. 28.70 b. 240,000 miles c. 0.0003809 d. 0.00210 e. 4 degree 2L' Round off to three significant figures: a. 43.04 b. 8,855,000 c. 0.00430 Multiply: a. (pi) times 0.53 times 10^-8 cm. pi = 3.14159 b. 0.00012 times 212,500 Add: a. 4.2 m. and 38.51 cm. Subtract: a. 0.000395 from 0.00162 Divide: a. 0.0010 into 0.0000370421 Express in decimal notation: a. 2.60 times 10^-4 b. 207.8 times 10^3 Calculate approximately (use one significant digit and standard numbers): a. 240,000 times 9,684,000 b. 240,000/0.00650X c. (0.0067 280 times (987,000,000)/3,087,200,000 times 0.0000421 d. (2,891,000)^1/2(pi)^2/0.006432 e. (28,900) times (0.0061)/7320/0.0004321000 f. (0.0004032) times (98.7 times 10^2)(0.006140) The width of a block is measured several times. The measurements are: 3.30 cm., 3.20 cm.: 3.28 cm.: 3.23 cm. Find: (a) the average width (b): the average deviation (c)the percent(relative) average deviation. Plot a graph of (X)(Y) = 10 in such a way that a straight line will result. A table of values of the variables should be included. The points need not be plotted too precisely. Define briefly: (a) origin (b) slope (c) ordinate True or false: The X- and Y- axes should always be numbered in the following manner (starting at zero at the origin:

Explanation / Answer

1. (A) 4 (B) 4 (C) 4 (D) 3 (E) 3

2. (a) 43.0

(b) 8,860,000

(c) 0.00430

3. (a) 1.7 x 10^-8

(b) 30

.4 (a) 42.7

5(a) 0.00012

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