03_InstSolManual_PDF_Part1

03_InstSolManual_PDF_Part1 - MOTION IN A PLANE 3 Answers to...

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Unformatted text preview: MOTION IN A PLANE 3 Answers to Multiple-Choice Problems 1. B 2. A 3. C 4. C 5. A 6. B 7. B 8. A 9. C 10. C 11. A 12. C 13. D 14. B 15. D 16. B 17. B Solutions to Problems 3.1. Set Up: Since distances are given in km, use km / s as units for velocity. Solve: (a) 1 vx 2 av 5 Dy Dx 6.24 km 2 5.00 km 0.925 km 2 1.20 km 5 5 1.09 km / s; 1 vy 2 av 5 5 5 20.24 km / s Dt 1.14 s Dt 1.14 s S (b) vav and its components are shown in Figure 3.1. y O 1vy2 av 1 vx2 av f vav x Figure 3.1 vav 5 " 1 vx 2 av2 1 1 vy 2 av2 5 1.12 km / s; tan f 5 1 vy 2 av 1 vx 2 av and f 5 12.4°, below the 1x axis. 3.2. Set Up: Since the velocity is expressed in units of km / h and the time interval is in seconds, it is convenient to express the acceleration in mixed units of km / h # s. Solve: (a) 1 ax 2 av 5 S D vy 838 km / h 2 625 km / h 365 km / h 2 415 km / h D vx 5 5 79.8 km / h # s; 1 ay 2 av 5 5 5218.7 km / h # s Dt 6.52 s 2 3.85 s Dt 6.52 s 2 3.85 s y O (b) a av and its components are shown in Figure 3.2. 1 ax2 av f aav x 1ay2 av Figure 3.2 aav 5 " 1 ax 2 av2 1 1 ay 2 av2 5 820 km / h # s; tan f 5 1 vy 2 av 1 vx 2 av and f 5 13.2°, below the 1x-axis. 3-1 ...
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