Calmweek14W14solutions

Calmweek14W14solutions - HOMEWORK: Week 13 Chapter 14-...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: HOMEWORK: Week 13 Chapter 14- SOLUTIONS (14.2) A surfer floating beyond the breakers notes 14 waves per minute passing his position. If the wavelength of these waves is 34 m, what is their speed? SOLUTION 2 (34 m)(14 Hz) 4.8 10 m s v f = = = (14.12) Two steel guitar strings have the same length. String A has a diameter of 0.50 mm and is under 410.0 N of tension. String B has a diameter of 1.0 mm and is under a tension of 820.0 N. Find the ratio of the wave speeds, v v A B / , in these two strings. SOLUTION , F v = and a doubled diameter means a quadrupled cross-sectional area, thus a quadrupled mass per length, . A A B B A B A B 4.0 410 N 4.0 820 N 1.4 v F v F F F = = = = (14.16) A wave on a string is described by the following equation: y x t = F H G I K J 15 50 12 cm cos cm s b g . (a) What is the amplitude of this wave? (b) What is its wavelength? (c) What is its period? (d) What is its speed? (e) In which direction does the wave travel? SOLUTION The form is 2 2 cos . y A x t T = (a) A = 15 cm (b) 2 , 5.0 cm = so 10 cm = (c) 2 , 12 s T = so T = 24 s (d) 10 cm 0.42 cm s 24 s v f T = = = = (e) To the right, because the t-term has the opposite sign of the x-term. (14.20) Dolphins of the open ocean are classified as Type II Odontocetes (toothed whales). These animals use ultrasonic clicks with a frequency of about 55 kHz to navigate and find prey. (a) Suppose a dolphin sends out a series of clicks that are reflected back from the bottom of the ocean 75 m below. How much time elapses before the dolphin hears the echoes of the below....
View Full Document

This note was uploaded on 07/02/2011 for the course PHYS 201 taught by Professor Woodahl during the Fall '09 term at Indiana.

Page1 / 9

Calmweek14W14solutions - HOMEWORK: Week 13 Chapter 14-...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online