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43 ARMY AIR FORCES d. Exercises: (1) Tell which of the following are vectors and which are scalars: (a) 2 pounds. (b) 20 mph east. (c) 10 feet/second. (d) Acceleration of a falling body. (e) A velocity. (2) Graph the following: (a) 30 mph NW. (b) 40 yards/minute north. (c) 30 pounds force acting N 10° E. (d) 17 pounds force acting S 50° W. (e) 99 pounds at 182°. (f) 14 mph at 37°. (g) 18 feet/second at 282°. (3) Add the following Vectors (V1 + V2): (a) V1: Length =340 V2: Length =410 Azimuth=323° Azimuth=20° (b) V1: Length =10 V2: Length =15 Azimuth=200° Azimuth=140° Length=22, azimuth=163° Answer. (c) V1: Length =.05 V2: Length =.16 Azimuth=270° Azimuth=10° (d) V1: Length =12 V2: Length =18 Azimuth=82° Azimuth=126° Length=28, azimuth=108° Answer. (e) V1: Length =163 V2: Length =313 Azimuth=191° Azimuth=264° (f) V1: Length =.5 V2: Length =.73 Azimuth=0° Azimuth=180° Length=23, azimuth=180° Answer. (4) A car moves at the rate of 40 mph due north for 2 hours, then turns and goes due east for 1 hour. Find by vector diagram how far in a straight line the car is from its starting point. How much time would have been saved by traveling the straight route? 89.44;.764 hr or 45.8 min. Answer. 70