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1171319390

# 1171319390 - Chapter 2 2.10 A physics professor leaves her...

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2.10 A physics professor leaves her house and walks along the sidewalk toward campus. After 5 min it starts to rain and she returns home. Her distance from her house as a function of time is shown in Fig. 2.29. At which of the labeled points is her velocity a) zero? b) constant and positive? c) constant and negative? d) increasing in magnitude? e) decreasing in magnitude? Fig. 2.29 2.12 Fig. 2.30 shows the velocity of a solar powered car as a function of time. The driver accelerates from a stop sign, cruises for 20 s at a constant speed of 60 km/h, and then brakes to come to a stop 40 s after leaving the stop sign. Compute the average acceleration for the following time intervals: a) t =0 to t =10 s; b) t = 30 s to t = 40 s; c) t =10s to t = 30 s; d) t = 0 to t = 40 s. Fig. 2.30 2.19 Fig. 2.31 is a graph of the coordinate of a spider crawling along the x-axis. a) Graph its velocity and acceleration as functions of time. b) In a motion diagram (like Fig. 2.13b or 2.14b), show the position, velocity, and acceleration of the spider at the fives

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1171319390 - Chapter 2 2.10 A physics professor leaves her...

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