Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A computer to be used in a satellite must be able to withstand accelerations of up to 21 times the acceleration due to gravity . In a test to see if it meets this specification , the computer is bolted to a frame that is vibrated back and forth in simple harmonic motion at a frequency of 8.1 Hz . What is the minimum amplitude of vibration that must be used in this test ?
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A loudspeaker diaphragm is producing a sound for 1.9 s by moving back and forth in a simple harmonic motion . The angular frequency of the motion is 6.84 104 rad/s . How many times does the diagram move back and forth ?
Physics Waves And Oscillations Level: High School
Spring Constant
A 0.78 kg block is hung from and stretches a spring that is attached to the ceiling. A second block is attached to the first one , and the amount that the spring stretches from its unstrained length quadruples . What is the mass of he second block ?
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A system component is clamped to a vibration testing machine and subjected to sinusoidal vibrations to test the component under conditions of SHM. The amplitude is 2 cm, with a vibration frequency of 25 Hz and the test specifies an acceleration amplitude of 10 g (98.1 m s-2) . The component passes through the origin at time = 0.0 s , traveling in the +y-direction . At what time does the component first pass through the position y = 1.5 cm and what positions will have the speed of 3.0 m s-1 .
Physics Waves And Oscillations Level: High School
Interference
Consider two sources of sound , each of which emits a sound wave of the SAME frequency and SAME intensity . The sources are located on a straight road , relative close to each other . You (the listener) are also located on the same road , about 200 meters away . All 3 objects (source A , source B and you) are in a straight line . Which of the following statements are true ?a) If you hear an intensity level of 10 dB from one source alone , then the two sources combined will give a level of 20 dB
b) If the two sources are separated by 3/2 wavelengths , there will be destructive interference at your position.
c) If you hear an intensity level of 10 dB from one source alone . then the two source combined will give a level of less than 20 dB .
d) For beats to occur , the sound waves from the two sources must have different amplitudes.
e) If the sources are separated by 4 wavelengths , there will be constructive interference at your position .
Physics Waves And Oscillations Level: High School
Interference
Two loudspeakers are located on one wall of a room and are separated by a distance of 8 m along the wall . The speakers are in phase with each other . A listener sits in a chair directly in front of the speakers ,at a distance of 11.2 m from that speaker . If the listener hears destructive interference at this point , what is the minimum frequency (in Hz) of the sound emanating from the two speakers ? Consider the speed of sound in air to be 343.0 m/s .a) 31.8
b) 46.1
c) 66.9
d) 97.0
e) 140.6
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
Consider an ideal pendulum consisting of a “bob” of mass m hanging from a light (massless) string of length L . The pendulum swings back and the forth in simple harmonic motion (SHM) . You may assume that the oscillations are small ,so that the motion is “ideal” SHM . Which of the statements below are true ?a) If the initial amplitude doubles , the frequency will increase by a factor of 1.4
b) If the pendulum is moved to Jupiter , the frequency will decrease
c) In order to deduce the value of g (accel ,due to gravity ) , you would need to measure the length and the period of the pendulum .
d) If the string length is changed to 4L , the frequency will increase by a factor of 2
e) If the mass of the pendulum bob is changed to 4m , the frequency will increase by a factor of 4 .
Physics Waves And Oscillations Level: High School
Intensity of Sound
You are a rock concert , standing 10.0 m from one of the loudspeakers . You measure the decibel level to be 109.9 dB at this location . You are worried that this intensity level may be harmful to your ears , so you want to move farther away from the loudspeaker to reduce the sound to a “dull roar” at a decibel level of 84.0 dB . What distance (in meters) would you have to be from the loudspeaker to reach this reduced decibel level ?a) 130
b) 152
c) 178
d) 208
e) 243
Physics Waves And Oscillations Level: High School
Standing Waves
We are going to examine standing waves on a string in the familiar context of a guitar . Which of the statements below are true ? (Give ALL correct answer: B,AC,BCD…., or None).a) If a guitar string is out of tune by being too low in frequency , then you should loosen that frequency .
b) To tune a guitar ,you change the actual length of the strings .
c) The middle of a string must always be an anti-node in this standing wave .
d) For a given string ,the shorter the vibrating part , the higher the frequency of the sound .
e) In general , the lighter (thin) strings make lower frequencies than the heavier (thick) strings .
Physics Waves And Oscillations Level: High School
Standing Waves
A pipe (open at both ends ) in air at 12.5 degree C is to be designed to produce two successive harmonics at 450 Hz and 500 Hz . How long (in meters) must the pipe be ?a) 2.47
b) 2.89
c) 3.38
d) 3.96
e) 4.63
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A mass sits on a frictionless table . It is attached to a wall by a spring . The mass is initially located at x = 0 when the spring is unstretched (equilibrium position) . You pull the mass away from the equilibrium position , out of x = A , and then released it . The mass then oscillates horizontally back and forth in simple harmonic motion . Which of the statement below are true about this motion ?a) The total energy of the mass-spring system at x = A is the same as the total energy at x =0
b) The amplitude (A) is defined as the maximum displacement of the mass (ie, the greatest distance from the equilibrium point)
c) The potential energy of the mass spring system is maximum at x = -A
d) The magnitude of acceleration of the mass is maximum at x = -A
e) The speed of the mass is maximum at x = 0
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A 0.353 kg mass is attached to a spring with a force constant of 45.6 N/m and released from rest a distance of 7.90 cm from the equilibrium position of the spring . Calculate the speed (in m/s) of the mass when it is halfway to the equilibrium position .a) 0.44
b) 0.58
c) 0.78
d) 1.03
e) 1.38
Physics Waves And Oscillations Level: High School
Sound Level Intensity
The intensity of sound at a given point is measured to be 0.0005 W/m^2 ,what is the decibel level of the sound ?a) 87 dB
b) 90 dB
c) 55 dB
d) 97 dB
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
A pendulum of length 2 meters is taken to a moon . If this pendulum makes 10 oscillations in 32.0 seconds , what is the value of gravitational acceleration on this moon ?a) 2.54 m/s^2
b) 3.86 m/s^2
c) 7.71 m/s^2
d) 9.86 m/s^2
Physics Waves And Oscillations Level: High School
Simple Harmonic Motion
When the amplitude of a pendulum decreases to half its initial value , the period will have :a) Remained the same
b) Halved
c) Doubled