The lower the frequency of a sound wave, the
Sound vibrations with frequencies greater than 20,000 Hz are called
What happens to a simple pendulumʹs frequency if both its length and mass are increased?
What is the amplitude (in meters) of a wave whose displacement is given by y = 50. sin(0.20x + 120t) cm?
What happens to the velocity of sound in a gas when the absolute temperature of that gas is doubled?
Simple Harmonic Motion is characterized by
Several electrons are placed on a hollow metal sphere. They
8) Fig. 15-5 shows four Gaussian surfaces surrounding a distribution of charges. Which Gaussian surfaces have an electric flux of +q/εo through them?
When a wave obliquely crosses a boundary into another medium, it is
A sound source departs from a stationary observer. The frequency heard by the observer is
A car approaches you at a constant speed, sounding its horn, and you hear a frequency of 76 Hz. After the car goes by, you hear a frequency of 65 Hz. What is the frequency of the sound emitted by the horn? The speed of sound in air is 343 m/s
A mass swinging on the end of a massless string, as shown in Fig. 13-2, undergoes SHM. Where is the instantaneous acceleration of the mass greatest?
Compared to the wavelength of a 400 Hz sound, the wavelength of a 200 Hz sound in air is
A closed organ pipe of length 0.750 m is played when the speed of sound in air is 340. m/s. What is the fundamental frequency?
A mass is attached to a spring of spring constant 60 N/m along a horizontal, frictionless surface. The spring is initially stretched by a force of 5.0 N on the mass and let go. It takes the mass 0.50 s to go back to its equilibrium position when it is oscillating. What is the period of oscillation?
Two coherent sound waves will destructively interfere when the path difference is the wavelength times what?
As shown in Fig. 15-1, a point charge of +Q is placed at the centroid of an equilateral triangle. When a second charge of +Q is placed at one of the triangleʹs vertices, an electrostatic force of 4.0 N acts on it. What is the magnitude of the force that acts on the center charge due to a third charge of +Q placed at one of the other vertices?
When an electron is removed from a neutral atom, it becomes
A metal sphere of radius 10 cm carries a charge of +2.0 μC. What is the magnitude of the electric field 5.0 cm outside the sphereʹs surface?
Compare two vibrating strings, each has the same tension, but the second has four times the mass density of the first. The wave speed along the 2nd string is how many times the speed along the 1st?
The half angle of the conical shock wave produced by a supersonic aircraft is 60 °. What is the Mach number of the aircraft
Which part of a vibrating string experiences the maximum acceleration
The decibel level of sound is related to its
What is the speed of sound in air at freezing temperature?
Consider the wave shown in Fig. 13-4. The amplitude
The wavelength in Fig. 13-
If the intensity of sound changes (increases) by a factor of 100, the decibel level changes by a factor of
Which of the following is an accurate statement?
A simple pendulum consists of a mass M attached to a weightless string of length L. For this system, when undergoing small oscillations
In a resonating pipe which is open at one end and closed at the other, there
The main difference between conductors and insulators is in terms of
Fig. 15.5 shows four Gaussian surfaces surrounding a distribution of charges. Which Gaussian surfaces have no electric flux through them?
The total energy stored in simple harmonic motion is proportional to the
The total distance traveled by an object in one complete cycle of Simple Harmonic Motion is ________ times the amplitude.
In music the 3rd harmonic is which overtone?
Consider an open pipe of length L. What are the wavelengths of the three lowest tones produced by this pipe?
An electron and a proton are separated by a distance of 1 m. What happens to the size of the force on the proton if the electron is moved 0.5 m closer to the proton?
Grandfather clocks often are built so that each one-way swing of the pendulum is a second. How long is the length of a simple pendulum for a 2.00 second period?
One of the harmonics of a string fixed at both ends has a frequency of 52.2 Hz and the next higher harmonic has a frequency of 60.9 Hz. What is the fundamental frequency of the string?
In electricity, what quantity is analogous to the ʺacceleration of gravityʺ g (which is a force per unit mass)?
Electric field lines
) In many cartoon shows, a character runs of a cliff, realizes his predicament and lets out a scream. He continues to scream as he falls. If the physical situation is portrayed correctly, from the vantage point of an observer at the top of the cliff leaning over the edge, the pitch of the scream should be
The reason that you do not observe a Doppler shift when you listen to the car radio while driving is that
A string of linear density 1.5 g/m is under a tension of 20. N. What should its length be if its fundamental resonance frequency is 220. Hz?
Which of the arrows shown in Figure 19-12 represents the correct direction of the electric field between the two metal plates?
Three point charges are located at the following positions: Q1 = 2.00 μC at x = 1.00 m; Q2 = 3.00 μC at x = 0; Q3 = -5.00 μC at x = -1.00 m. What is the magnitude of the force on the 3.00-μC charge?
The electric field shown in Fig. 15-3
Doubling only the amplitude of a vibrating mass-and-spring system produces what effect on the systemʹs mechanical energy?
When waves interfere, the result is ________ original waves (ʺthey interfereʺ)
If you take a given pendulum to the moon, where the acceleration of gravity is less than on Earth, the resonant frequency of the pendulum will
Fig. 15-8 shows electric field lines near two electric point charges. If Q1 = -1 μC, what is the value of Q2?
Sound intensity is defined as
Three point charges each equal to 10 microcoulombs are located at x = 1m, x = 2m, and x = 3m, respectively, on the x-axis. What is the magnitude of the electric field at the origin?
A factory siren indicating the end of a shift has a frequency of 80 Hz. What frequency is perceived by the occupant of a car traveling towards the factory at 30 m/s? The speed of sound in air is 343 m/s
If one doubles the tension in a violin string, the fundamental frequency of that string will be how many times the original frequency?
A sound source approaches a stationary observer. The frequency heard by the observer is
What is the frequency (in Hz) of a wave whose displacement is given y = 50. sin(0.20x + 120t), where x and y are in cm and t in seconds?
What are the magnitude and direction of the electric field at a distance of 1.50 m from a 50.0-nC charge?
A mass vibrates back and forth from the free end of an ideal spring (k = 20. N/m) with an amplitude of 0.25 m. What is the maximum kinetic energy of this vibrating mass
The frequency in Fig. 13-4