# B water c both the same page 7 the gure shows a

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Unformatted text preview: s, the cart’s acceleration A) points to the left B) is zero C) points to the right t=2s 5cm Do one of these two problems, or both for extra credit. 2 (c) What is the spring constant k of the spring? 2 (d) How fast is the cart moving at t = 1 s? 3 13. A) air In which material is the speed of sound faster? B) water C) both the same Page 7 The ﬁgure shows a standing wave on a string. How many antinodes does it have? A) 2 B) 3 C) 4 D) 5 E) 6 Displacement !y (m) 3 14. v = 8m/s Position x (m) 15. The ﬁgure shows a snapshot of a wave on a string, moving at 8 m/s to the right. 2 (b) The amplitude A of this wave is A) 0.5 m B) 1 m C) 2 m D) 5 m The wavelength λ of this wave is A) 0.5 m B) 1 m C) 2 m D) 5 m 2 (c) v = 8m/s Position x (m) As this wave moves, how many crests will pass the right-hand border of the graph each second? A) 0.25 3 16. Displacement !y (m) 2 (a) B) 1 C) 2 D) 2.5 E) 4 F) 8 If I pluck a 1 m long string (tied down to two ends), a series of standing waves are set up in the stri...
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