Concept explainers
A dog swims from one end of a pool to the opposite end. Is the dog’s motion described as a wave? Explain.
Explain whether the motion of the dog swimming in water can be described as a wave or not.
Answer to Problem 1PQ
The motion of the dog swimming in water cannot be described as a wave. The dog creates water waves in pool but is itself behaves as a particle.
Explanation of Solution
The dog is modeled as a particle moving from one end to the other end of the pool,. It creates waves in the pool, but it is only the transfer of matter instead of the transfer of energy from one point to the other.
In order to consider as a wave, there must be energy transfer rather than an exchange of matter.
Since the dog is a matter, the transfer of matter can be considered to be a particle.
Conclusion:
Therefore, the motion of the dog swimming in water cannot be described as a wave. The dog creates water waves in pool but is itself behaves as a particle.
Want to see more full solutions like this?
Chapter 17 Solutions
Physics for Scientists and Engineers: Foundations and Connections
- (a) If a long rope is hung from a ceiling and waves are sent up the rope from its lower end, why does the speed of the waxes change as they ascend? (b) Does the speed of the ascending waves increase or decrease? Explain.arrow_forwardAn undersea earthquake or a landslide can produce an ocean wave of short duration carrying great energy, called a tsunami. When its wavelength is large compared to the ocean depth d, the speed of a water wave is given approximately by v=gd. Assume an earthquake occurs all along a tectonic plate boundary running north to south and produces a straight tsunami wave crest moving everywhere to the west. (a) What physical quantity can you consider to be constant in the motion of any one wave crest? (b) Explain why the amplitude of the wave increases as the wave approaches shore. (c) If the wave has amplitude 1.80 m when its speed is 200 m/s, what will be its amplitude where the water is 9.00 m deep? (d) Explain why the amplitude at the shore should be expected to be still greater, but cannot be meaningfully predicted by your model.arrow_forwardThe displacement of the air molecules in sound wave is modeled with the wave function s(x,t)=5.00nmcos(91.54m1x3.14104s1t) . (a) What is the wave speed of the sound wave? (b) What is the maximum speed of the air molecules as they oscillate in simple harmonic motion? (c) What is the magnitude of the maximum acceleration of the air molecules as they oscillate in simple harmonic motion?arrow_forward
- Review. A 150-g glider moves at v1 = 2.30 m/s on an air track toward an originally stationary 200-g glider as shown in Figure P16.53. The gliders undergo a completely inelastic collision and latch together over a time interval of 7.00 ms. A student suggests roughly half the decrease in mechanical energy of the two-glider system is transferred to the environment by sound. Is this suggestion reasonable? To evaluate the idea, find the implied sound level at a position 0.800 m from the gliders. If the students idea is unreasonable, suggest a better idea. Figure P16 53arrow_forwardA wave traveling on a Slinky® mat is stretched to 4 m takes 2.4 s to travel the length at me Slinky and back again. (a) What is the speed of the wave? (b) Using the same Slinky stretched to the same length, a standing wave is created which consists of three antinodes and four nodes. At what frequency must the Slinky be oscillating?arrow_forwardIn Section 16.7, we derived the speed of sound in a gas using the impulsemomentum theorem applied to the cylinder of gas in Figure 16.20. Let us find the speed of sound in a gas using a different approach based on the element of gas in Figure 16.18. Proceed as follows. (a) Draw a force diagram for this element showing the forces exerted on the left and right surfaces due to the pressure of the gas on either side of the element. (b) By applying Newtons second law to the element, show that (P)xAx=Ax2st2 (c) By substituting P = (B s/x) (Eq. 16.30), derive the following wave equation for sound: B2sx2=2st2 (d) To a mathematical physicist, this equation demonstrates the existence of sound waves and determines their speed. As a physics student, you must take another step or two. Substitute into the wave equation the trial solution s(x, t) = smax cos (kx t). Show that this function satisfies the wave equation, provided /k=v=B/.arrow_forward
- Review. A block of mass M = 0.450 kg is attached to one end of a cord of mass m = 0.003 20 kg: the other end of the cord is attached to a fixed point. the block rotates with constant angular speed = 10.0 rad/s in a circle on a frictionless, horizontal table as shown in Figure p16.55. What time interval is required for a transverse wave to travel along the string from the center of the circle to the block?arrow_forwardA swimmer in the ocean observes one day that the ocean surface waves are periodic and resemble a sine wave. The swimmer estimates that the vertical distance between the crest and the trough of each wave is approximately 0.45 m, and the distance between each crest is approximately 1.8 m. The swimmer counts that 12 waves pass every two minutes. Determine the simple harmonic wave function that would describes these waves.arrow_forwardThe tensile stress in a thick copper bar is 99.5% of its elastic breaking point of 13.0 1010 N/m2. If 500-Hz sound wave is transmitted through the material, (a) what displacement amplitude will cause the bar to break? (b) What is the maximum speed of the elements of copper at this moment? (c) What is the sound intensity in the bar?arrow_forward
- A train whistle (f = 400 Hz) sounds higher or lower in frequency depending on whether it approaches or recedes. (a) Prove that the difference in frequency between the approaching and receding train whistle is f=2u/v1u2/v2f where u is the speed of the train and v is the speed of sound. (b) Calculate this difference for a train moving at a speed of 130 km/h. Take the speed of sound in air to be 340 m/s.arrow_forwardReview. A steel guitar string with a diameter of 1.00 mm is stretched between supports 80.0 cm apart. The temperature is 0.0C. (a) Find the mass per unit length of this siring. (Use the value 7.86 103 kg/m4 for the density.) (b) The fundamental frequency of transverse oscillations of the string is 200 Hz. What is the tension in the string? Next, the temperature is raised to 30.0C. Find the resulting values of (c) the tension and (d) the fundamental frequency. Assume both the Youngs modulus of 20.0 1010 N/m2 and the average coefficient of expansion = 11.0 10-6 (C)-1 have constant values between 0.0C and 30.0C.arrow_forwardTable 17.1 shows the speed of sound is typically an order of magnitude larger in solids than in gases. To what can this higher value be most directly attributed? (a) the difference in density between solids and gases (b) the difference in compressibility between solids and gases (c) the limited size of a solid object compared to a free gas (d) the impossibility of holding a gas under significant tensionarrow_forward
- Physics for Scientists and Engineers: Foundations...PhysicsISBN:9781133939146Author:Katz, Debora M.Publisher:Cengage LearningPhysics for Scientists and Engineers, Technology ...PhysicsISBN:9781305116399Author:Raymond A. Serway, John W. JewettPublisher:Cengage LearningPrinciples of Physics: A Calculus-Based TextPhysicsISBN:9781133104261Author:Raymond A. Serway, John W. JewettPublisher:Cengage Learning
- Glencoe Physics: Principles and Problems, Student...PhysicsISBN:9780078807213Author:Paul W. ZitzewitzPublisher:Glencoe/McGraw-HillCollege PhysicsPhysicsISBN:9781938168000Author:Paul Peter Urone, Roger HinrichsPublisher:OpenStax CollegeCollege PhysicsPhysicsISBN:9781305952300Author:Raymond A. Serway, Chris VuillePublisher:Cengage Learning