Please I need help with these questions, I need to study them for my exam. Thank

Question

Please I need help with these questions, I need to study them for my exam. Thanks in advance :)

5. -12 points Walker4 14.P.001 My Not A wave travels along a stretched rope. The vertical distance from crest to trough for this wave is 14 cm and the horizontal distance from crest to trough is 26 cm. (a) What is the wavelength of this wave? cm (b) What is the amplitude of this wave? cm 6. +)-/1 points Walker4 14P002. My Not A surfer floating beyond the breakers notes 16 waves per minute passing his position. If the wavelength of these waves is 35 m, what is their speed? m/s +-/1 points Walker4 14P004 My Not A typical tidal wave (tsunami) can have a speed of 753 km/h and a wavelength of 323 km. What is the frequency of such a wave? Hz 8. +-/1 points Walker4 14P013 +-1 points Walker4 14.P.013 My Not Waves on a particular string travel with a speed of 19 m/s. By what factor should the tension in this string be changed to produce waves with a speed of 57 m/s? (Fnew/ Fold) =

Explanation / Answer

5)

AMplitude = distance betweem crest and trough /2 = / =7cm

Wavelength = * horizontal distance between crest and trough = 2*26 = 52 cm

6) f = 16/60 Hz

speed = wavelength * frequency = 35*16/60 = 9.333 m/s

7) speed = freq *wavelength

753*1000/ 60*60 = 323*1000 * freq ==> freq = 6.47 *10^-4 Hz

8) F is proportion to v^2

Fnew/ Fold = (vnew /vold)^2 = (57/19)^2 = 9

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