02_InstSolManual_PDF_Part2

02_InstSolManual_PDF_Part2 - 5 x 4 2 x 4.0 s 5 4.0 m / s v...

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(b) (c) The hiking time is 2.5. Set Up: Solve: (a) A to B : B to C : A to C : (b) The velocity is always in the same direction so the distance traveled is equal to the displacement in each case, and the average speed is the same as the magnitude of the average velocity. Reflect: The average speed is different for different time intervals. 2.6. Set Up: Solve: (a) A to B : B to C : A to C : (b) For A to B and for B to C the distance traveled equals the magnitude of the displacement and the average speed equals the magnitude of the average velocity. For A to C the displacement is zero. Thus, the average velocity is zero but the distance traveled is not zero so the average speed is not zero. For the motion A to B and for B to C the veloc- ity is always in the same direction but during A to C the motion changes direction. 2.7. Set Up: The positions at time t are: Solve: (a) The distance is (b) (i) (ii) (iii) (iv) (v) Reflect: In successive 1 s time intervals the boulder travels greater distances and the average velocity for the inter- vals increases from one interval to the next. v av, x
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Unformatted text preview: 5 x 4 2 x 4.0 s 5 4.0 m / s v av, x 5 x 4 2 x 3 1.0 s 5 7.0 m / s; v av, x 5 x 3 2 x 2 1.0 s 5 5.0 m / s; v av, x 5 x 2 2 x 1 1.0 s 5 3.0 m / s; v av, x 5 x 1 2 x 1.0 s 5 1.0 m / s; v av-x 5 D x D t . x 3 2 x 1 5 8.0 m. x 4 5 16.0 m. x 3 5 9.0 m, x 2 5 4.0 m, x 1 5 1.0 m, x 5 0, x t v av-x 5 x C 2 x A t C 2 t A 5 v av-x 5 x C 2 x B t C 2 t B 5 2 25.0 m 3.0 s 5 2 8.3 m / s v av-x 5 D x D t 5 x B 2 x A t B 2 t A 5 25.0 m 3.0 s 5 8.3 m / s v av-x 5 D x D t x C 5 0. x B 5 25.0 m, x A 5 0, t C 5 6.0 s. t B 5 3.0 s, t A 5 0, ( 1 x-direction), v av-x 5 x C 2 x A t C 2 t A 5 9.0 m 5.0 s 5 1.8 m / s v av-x 5 x C 2 x B t C 2 t B 5 6.0 m 4.0 s 5 1.5 m / s v av-x 5 D x D t 5 x B 2 x A t B 2 t A 5 3.0 m 1.0 s 5 3.0 m / s v av-x 5 D x D t t C 5 5.0 s. t B 5 1.0 s, t A 5 0, x C 5 9.0 m. x B 5 3.0 m, x A 5 0, Average speed 5 2650 miles 672 h 5 3.9 mi / h 1 12 weeks 21 7 days / week 21 8 h / day 2 5 672 h. v av-x 5 D x D t 5 1000 mi 2016 h 5 0.50 mi / h 2-2 Chapter 2...
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