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Chapter 12: Q65P (page 328)
(I) The wake of a speedboat is 12° in a lake where the speed of the water wave is 2.2 km/h. What is the speed of the boat?
The speed of the boat is \(10.58\;{\rm{km/h}}\).
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A person, with his ear to the ground, sees a huge stone strike the concrete pavement. A moment later two sounds are heard from the impact: one travels in the air and the other in the concrete, and they are 0.80 s apart. How far away did the impact occur? See Table 12-1.
A pipe in air at \({\bf{23}}{\bf{.0^\circ C}}\) is to be designed to produce two successive harmonics at \({\bf{280}}\;{\bf{Hz}}\) and\({\bf{320}}\;{\bf{Hz}}\). How long must the pipe be, and is it open or closed?
Question: Each string on a violin is tuned to a frequency \({\bf{1}}\frac{{\bf{1}}}{{\bf{2}}}\) times that of its neighbor. The four equal-length strings are to be placed under the same tension; what must be the mass per unit length of each string relative to that if the lowest string?
Question: (I) A piano tuner hears one beat every 2.0 s when trying to adjust two strings, one of which is sounding 350 Hz. How far off in frequency is the other string?
A hiker determines the length of a lake by listening for the echo of her shout reflected by a cliff at the far end of the lake. She hears the echo 2.5 s after shouting. Estimate the length of the lake.
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