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B. Solve the following problems 1. The weights of three pieces of wood were 1.543 + 0.003 g, 2.2233 + 0.0002 g, and 2.9342 + 0.0005 g. a. What is the absolute uncertainty in the total mass? b. What is the relative uncertainty in the total mass? 2. Given: P = 60 km at 150 N of E Q = 45 km at 250 E of N R = 20 km at 280 S of E S = 15 km at 330 S of W Q b. P + R C. R+S d. Q +5 3. Add the following pairs of vectors. For each problem, make a rough sketch and show all your work. Write the magnitude and direction of the resultant. a. 6 miles north and 13 miles west b. 83 m/s east and 51 m/s south c. 0.06 km/hr east and 0.04 km/hr north