Search: What will be the beat frequency heard when the two strings are played together?

Number of results: 5,796

Physics
A guitar string has a tension of 100 N and is supposed to have a frequency of 110 Hz. When a standard tone of that value is sounded while the string is plucked, a beat frequency of 2 Hz is heard. The peg holding the string is loosened (decreasing the tension) and the beat ...
Sunday, February 3, 2013 at 3:31pm by Ryan

physics
.Two automobiles are equipped with the same single-frequency horn. When one is at rest and the other is moving toward an observer at 14 m/s, a beat frequency of 5.1 Hz is heard. What is the frequency the horns emit? Assume T = 20°C.
Monday, April 9, 2012 at 10:37pm by Anonymous

physics
When a guitar string is sounded along with a 440Hz tuning fork, a beat frequency of 5Hz is heard. When the same string is sounded along with a 43Hz tuning fork, the beat frequency is 9Hz. What is the frequency of the string??.. The first thing i thought of doing was putting ...
Sunday, May 17, 2009 at 4:59pm by help:(

Physics
When two tuning forks are stuck simultaneously, 3 beats per second are heard. The frequency of one fork is 510 Hz. A piece of wax is placed on the 510 Hz fork to lower its frequency slightly. If the beat frequency is increased, what is the correct frequency for the second fork...
Wednesday, May 15, 2013 at 4:38pm by dallas

physics
An observer rides with a moving sound source directly toward a large vertical wall. The vehicle has a constant speed of 10m/s and the source has a frequency of 150Hz. What beat frequency is heard by the observer as a result of the combination of the direct and reflected sounds?
Wednesday, January 16, 2013 at 7:34am by Offiong

Physics
Two cars have identical horns, each emitting a frequency of f= 395 hz. One of the cars is moving with a speed of 12 m/s toward a bystander waiting at a corner, and the other car is parked. The speed of sound is 343 m/s. what is the beat frequency heard by the bystander?
Monday, July 23, 2012 at 1:16pm by hayley

waves and sound
1-A tunning fork has a frequency of 440Hz. The string of a violin and this tuning fork, when sounded together, produce a beat frequency of iHz. From these two pieces of information alone, is it possible to determine the exact frequency of the violin string?... I feel like this...
Sunday, May 17, 2009 at 7:49pm by Cynthia

Physics
Ultrasound reflected from an oncoming bloodstream that is moving at 30 cm/s is mixed with the original frequency of 1.3 MHz to produce beats. What is the beat frequency? (Velocity of sound in blood = 1540 m/s.) Beat frequency = Hz HELP: This problem involves two Doppler shifts...
Thursday, December 9, 2010 at 3:34pm by Angel

Physics
In one of the original Doppler experiments, one tuba was played on a moving platform car at a frequency of 75 Hz, and a second identical one was played on the same tone while at rest in the railway station. What beat frequency was heard if the train approached the station at a...
Thursday, February 11, 2010 at 6:55pm by Anonymous

Physics
From the original beat frequency of 3 Hz, you know that the "other" fork has a frequency of either 507 or 513 Hz. If you lower the frequency of the 510 Hz fork and get a higher beat frequency, the "other" fork must have the higher 513 Hz frequency, NOT 507.
Wednesday, May 15, 2013 at 4:38pm by drwls

More Frequency - Physics
A guitar player plucks two strings simultaneously. One string is tuned to a (fundamental) frequency of 381 Hz. It is found that beats are audible, with a beat frequency of 5.54 Hz. What are possible values for the frequency of the other string? (Answer the larger frequency ...
Monday, November 29, 2010 at 11:14pm by Rachel

physics--please help
Subtract the lower frequency from the higher frequency. The difference will be the "beat" frequency. That is how many times per second the combined sum of the two sound waves has a maximum.
Friday, March 30, 2012 at 6:51pm by drwls

physics--please help
40.8 mph = 18.24 m/s (a) Frequency at hill (approaching source) = 243• ( 1/(1 - 18.24 /340) ) Hz = 271.2 Hz (b) Reflected frequency at car (effective approaching source) = 271.2• ( 1/(1 - 18.24 /340) Hz = 271.2 Hz (c) Beat frequency is equal to the absolute value of ...
Sunday, April 1, 2012 at 10:53am by Elena

jefferson high school
The beat frequency is the difference of the two frequencies. I have never heard of a 20 Hz tuning fork. Humans would not even be able to hear it. Are you sure you copied the problem correctly?
Friday, January 6, 2012 at 7:28pm by drwls

physic
In certain ranges of a piano keyboard, more than one string is tuned to the same note to provide extra loudness. For example, the note at 110 Hz has two strings at this frequency. If one string slips from its normal tension of 550 N to 520.00 N, what beat frequency is heard ...
Wednesday, June 1, 2011 at 11:00am by sisca

Physics(Please help)
The two strings have the same tension and mass per unit length, but they differ in length by 0.54 cm. The waves on the shorter string propagate with a speed of 41.7 m/s, and the fundamental frequency of the shorter string is 227 Hz. Determine the beat frequency produced by the...
Friday, June 22, 2012 at 1:08pm by Hannah

Physics
One closed pipe organ has a length of 2.5 m. The frequency of the note is 34.3 Hz. When a second pipe is played at the same time, a 1.7 Hz beat note is heard. By how much is the second pipe too long? Would you have to use the frequency of the second pipe to find the length of ...
Thursday, December 6, 2007 at 10:12pm by Einstein

Physics
The beat frequency is 8Hz. What is f2 if f1 is 350Hz? F2=350Hz +/- 8Hz = 342Hz or 358Hz. If the beat frequency increases at 340Hz then it means that f2 must be 358Hz. Why??
Monday, June 3, 2013 at 8:08pm by Crystal

a bit challenging for me
Well, I am thinking that if you maybe add the known frequency output to your unknown output, you will get a beat frequency that goes to steady AC as your difference goes to zero. sin (w t)+ sin(w2t) = 2 sin .5(w+w2)t cos .5(w - w2)t when your unknown w = 2 pi f = your known w2...
Sunday, February 10, 2008 at 3:39pm by Damon

Physics
Two ships in a heavy fog are blowing their horns, both of which produce sound with a frequency of 165.0 Hz One ship is at rest; the other moves on a straight line that passes through the one at rest. If people on the stationary ship hear a beat frequency of 3.5 Hz, what is the...
Tuesday, November 22, 2011 at 8:44pm by Cooper

physics
A 0.0150 kg, 2.09 m long wire is fixed at both ends and vibrates in its simplest mode under a tension of 214 N. When a tuning fork is placed near the wire, a beat frequency of 5.20 Hz is heard. What are the possible frequencies of the tuning fork? I solved for speed using ...
Thursday, November 26, 2009 at 11:16pm by Anonymous

Science
If 26 m were the true wavelength and you used the correct speed of sound of in air about 300 m/s, the frequency would be 300/26 = 11 Hz, which cannot be heard. However, if the sound is being transmitted under water, the sound speed is about right and it is the frequency that ...
Sunday, July 27, 2008 at 6:53pm by drwls

physics
A car traveling at 22.1 m/s honks its horn as it directly approaches the side of a large building. The horn produces a long sustained note of frequency f0 = 235 Hz. The sound is reflected off the building back to the car's driver. The sound wave from the original note and ...
Saturday, April 2, 2011 at 10:22am by help me

physics
A car traveling at 24.3 m/s honks its horn as it directly approaches the side of a large building. The horn produces a long sustained note of frequency f0 = 213 Hz. The sound is reflected off the building back to the car's driver. The sound wave from the original note and ...
Friday, April 1, 2011 at 9:10am by jean

College Physics
Finally, your friend's twin engine jet airplane lands. As it stands on the runway, you hear the sound of the engines getting louder and softer, rhythmically once every 2.3 s. The average frequency you hear is 3650 Hz. What are the differences between the average frequency ...
Friday, December 10, 2010 at 4:03pm by Anonymous

Physics
Two out-of-tune flutes play the same note. One produces a tone that has a frequency of 242 Hz, while the other produces 288 Hz. When a tuning fork is sounded together with the 242-Hz tone, a beat frequency of 26.0 Hz is produced. When the same tuning fork is sounded together ...
Sunday, March 3, 2013 at 1:55pm by Tim

physical science
You get the 20 Hz, the 226 hz, the sum of the two and the difference of the two. The 20 and 226 are the original frequencies; the sum is one beat frequency and the difference is another beat frequency.
Monday, September 22, 2008 at 8:25pm by DrBob222

physics
Are you sure the 43 Hz tuning fork frequency is not a typing error? You can't get a 9 Hz beat frequency with that.
Sunday, May 17, 2009 at 4:59pm by drwls

Physics
Physics Question Finally, your friend's twin engine jet airplane lands. As it stands on the runway, you hear the sound of the engines getting louder and softer, rhythmically once every 2.3 s. The average frequency you hear is 3650 Hz. What are the differences between the ...
Monday, December 6, 2010 at 5:55pm by CollegeKid

physical
You are traveling in a car toward a hill at a speed of 42.1 mph. The car's horn emits sound waves of frequency 251 Hz, which move with a speed of 343 m/s. a) Determine the frequency with which the waves strike the hill. b) What is the frequency of the reflected sound waves...
Monday, July 16, 2012 at 4:58pm by itufizik

Physics
beats occur in nonlinear mediums, you get the sum, and the difference frequency. Often, we just look at the difference frequency as the beat...here it is 351.8-342.6=9.2hz period then is 1/9.2 seconds
Sunday, June 5, 2011 at 6:20pm by bobpursley

physical
You are playing a note that has a fundamental frequency of 466.16 Hz on a guitar string of length 59.9 cm. At the same time, your friend plays a fundamental note on an open organ pipe, and 4.0 beats per seconds are heard. The mass per unit length of the string is 1.85 g/m. ...
Monday, July 16, 2012 at 4:57pm by itufizik

Physics
Two eagles fly directly toward one another, the first at 13 m/s and the second at 21 m/s. Both screech, the first emitting a frequency of 3200 Hz and the second, a frequency of 3800 Hz. What frequencies do they hear if the speed of sound is 345 m/s? (Tip: keep 4 significant ...
Monday, December 6, 2010 at 6:23pm by Cindy

tech III math ( ACT Prep)
You can look at common multiples. The closest one is 12. 0, 4 seconds, 8 seconds, 12 seconds 0, 6 seconds, 12 seconds If you want to make it more complicated (I'm not sure your skill level or the level of the material) you could find the frequency of each and then the beat...
Monday, June 3, 2013 at 12:46am by @allthehomework

physics
You are traveling in a car toward a hill at a speed of 40.8 mph. The car's horn emits sound waves of frequency 243 Hz, which move with a speed of 340 m/s.The frequency with which the waves strike the hill is 254.7Hz and the frequency of the reflected sound waves you hear ...
Saturday, March 31, 2012 at 9:14pm by sara

physics - doppler effect
Two identical tuning forks can oscillate at 329.6 Hz. A person is located somewhere on the line between them. The speed of sound in the air is 343 m/s. Calculate the beat frequency as measured by this individual under the following conditions. (a) the listener is standing ...
Saturday, April 21, 2007 at 11:33pm by COFFEE

music
Can a beat be shown and not heard? I need to be able to demonstrate.
Tuesday, August 28, 2012 at 4:42pm by Kam

physics
You better google "beat frequency" !
Saturday, April 21, 2012 at 6:07pm by Damon

physics--please help
how do you find beat frequency?
Friday, March 30, 2012 at 6:51pm by sara

Physics
A Doppler blood flow meter emits ultrasound at a frequency of 5.0 MHz. What is the beat frequency between the emitted waves and the waves reflected from blood cells moving away from the emitter at 0.15m/s? Assume that v_sound=1540m/s in blood.
Saturday, November 7, 2009 at 8:26pm by N.

physical
Two identical half-open pipes each have a fundamental frequency of 450 Hz. What percentage change in the length of one of the pipes will cause a beat frequency of 13.0 Hz when they are sounded simultaneously? Assume the speed of sound in air is 342 m/s.
Monday, July 16, 2012 at 4:58pm by itufizik

physics--please help
You are traveling in a car toward a hill at a speed of 40.8 mph. The car's horn emits sound waves of frequency 243 Hz, which move with a speed of 340 m/s.The frequency with which the waves strike the hill is 254.7Hz and the frequency of the reflected sound waves you hear ...
Sunday, April 1, 2012 at 5:28pm by sara

Physics
The beat frequency 8/2 = 4 Hz, equals the difference in frequencies.
Wednesday, May 5, 2010 at 9:00pm by drwls

Physics
calculate the doppler frequency , then the difference in that and 75 is the beat.
Thursday, February 11, 2010 at 6:55pm by bobpursley

phy
At a factory, a noon whistle is sounding with a frequency of 484 Hz. As a car traveling at 77 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory, the driver hears frequency ff. What is the change in frequency ff &#8722...
Friday, April 12, 2013 at 9:59pm by kira

physics
Two pipes, equal in length, are each open at one end. Each has a fundamental frequency of 475 Hz at 297 K. In one pipe the air temperature is increased to 304 K. If the two pipes are sounded together, what beat frequency results?
Friday, December 7, 2012 at 11:50pm by Emily

Physics
A certain dog whistle operates at 23.5 kHz, while another (brand X) operates at an unknown frequency. If neither whistle can be heard by humans when played separately, but a shrill whine of frequency 9200 Hz occurs when they are played simultaneously, estimate the operating ...
Monday, April 23, 2012 at 1:14pm by Zach

physics
A certain dog whistle operates at 23.5 kHz, while another (brand X) operates at an unknown frequency. If neither whistle can be heard by humans when played separately, but a shrill whine of frequency 9200 Hz occurs when they are played simultaneously, estimate the operating ...
Monday, April 23, 2012 at 9:55am by Drew

Physics- PLEASE HELP
Two pipes of equal length are each open at one end. Each has a fundamental frequency of 715 Hz at 300 K. In one pipe the air temperature is increased to 313 K. If the two pipes are sounded together, what beat frequency results?
Wednesday, December 5, 2012 at 10:55am by Tia

physics
Number of beats heard per second = 15/5 = 3 beats/sec. We know number of beats heard per second = difference in frequency of the two sound waves. So 3 = 440 - fp, where fp is the frequency of the piano key which is slightly lower than 440 Hz. Solving for fp, we get fp = 337 Hz.
Saturday, July 9, 2011 at 1:29pm by Katie

Physics- Please Help, soooo lost!
Two pipes of equal length are each open at one end. Each has a fundamental frequency of 715 Hz at 300 K. In one pipe the air temperature is increased to 313 K. If the two pipes are sounded together, what beat frequency results?
Tuesday, December 4, 2012 at 8:29pm by Mary

physics
The beat frequency is 1/0.88 = 1.14 Hz. That equals the difference in frequencies
Thursday, March 3, 2011 at 10:57pm by drwls

Physics
In the absence of a nearby metal object, the two inductances (LA and LB) in a heterodyne metal detector are the same, and the resonant frequencies of the two oscillator circuits have the same value of 580.0 kHz. When the search coil (inductor B) is brought near a buried metal ...
Thursday, April 11, 2013 at 2:54pm by Anonymous

Physics
In the absence of a nearby metal object, the two inductances (LA and LB) in a heterodyne metal detector are the same, and the resonant frequencies of the two oscillator circuits have the same value of 510.0 kHz. When the search coil (inductor B) is brought near a buried metal ...
Thursday, March 21, 2013 at 3:09pm by Elizabeth

physics
Two trains are moving in opposite diections on parallel tracks and are appoaching a station. Horns on both trains are producing sound of frequency of 500Hz. One train is approaching at 32m/sec. What is the speed of the other train if an observer at the station hears a beat ...
Tuesday, May 7, 2013 at 5:28pm by reddy22

physical science
beat frequency = f2 - f1 = 226 - 20 = 206 Hz
Friday, April 27, 2012 at 7:56pm by Elena

physics
Calculate the Doppler-shifted frequency of the received echo, fr. Let V be the car speed and a the speed of sound. fr = fo*[(V+a)/(V-a)] = 1.153*fo = 246 Hz Subtract fo from that for the beat frequency, 33 Hz
Friday, April 1, 2011 at 9:10am by drwls

physics--please help
yes they hit it at 256.7..i typed it wrong...i am still not getting the correct beat frequency
Sunday, April 1, 2012 at 5:28pm by sara

Physics please help me
Two identical guitar strings are stretched with the same tension between supports that are not the same distance apart. The fundamental frequency of the higher-pitched string is 400Hz, and the speed of transverse waves in both wires is 200 m/s. How much longer is the lower-...
Wednesday, December 12, 2012 at 11:36pm by Anonymous

Physics HW ...HELP!!
Two identical guitar strings are stretched with the same tension between supports that are not the same distance apart. The fundamental frequency of the higher-pitched string is 400Hz, and the speed of transverse waves in both wires is 200 m/s. How much longer is the lower-...
Wednesday, December 12, 2012 at 7:59pm by Anonymous

physics
15 beats are heard in 5 seconds when a piano key and a tuning fork of slightly higher frequency (440 Hz) are struck at the same time. What is the frequency of the sound emitted by the piano key?
Saturday, July 9, 2011 at 1:29pm by alicia

Physics
15 beats are heard in 5 seconds when a piano key and a tuning fork of slightly higher frequency (440 Hz) are struck at the same time. What is the frequency of the sound emitted by the piano key?
Wednesday, March 30, 2011 at 1:02pm by Brent

English
1. He beat/won Don at the game. 2. He won/beat the game. 3. He beat/won the team yesterday. 4. He won/beat at the competition. (Which verb do we have to use?) 5. She won a bronze medal at the Olypic Games. 6. She got a bronze medal at the Olympic Games. (Which verb do we have ...
Sunday, March 14, 2010 at 10:40pm by rfvv

Physics 20
The frequency change is called the Doppler shift. Calculate maximum pendulum speed V, which occurs at the bottom of the swing's motion. Conservation of Energy tells you that (1/2)V^2 = g * 0.386 m Solve for V. Then use the Doppler formula for the higher-pitched frequency ...
Monday, July 13, 2009 at 3:44am by drwls

physics
Two cars, one in front of the other, are traveling down the highway at 25 m/s. The car behind sounds its horn, which has a frequency of 500 Hz. What is the frequency heard by the driver of the lead car? (vsound = 340 m/s). I have the answer but I just don't know how to get...
Monday, July 12, 2010 at 9:03pm by Katie

physics
A half-open pipe is constructed to produce a fundamental frequency of 224 Hz when the air temperature is 15 °C. It is used in an overheated building when the temperature is 38 °C. Neglecting thermal expansion in the pipe, what frequency will be heard?
Tuesday, March 27, 2012 at 8:52am by no idea

physics--please help
A half-open pipe is constructed to produce a fundamental frequency of 230 Hz when the air temperature is 17 °C. It is used in an overheated building when the temperature is 39 °C. Neglecting thermal expansion in the pipe, what frequency will be heard?
Monday, March 26, 2012 at 6:23pm by sara

physics..please help me due in a couple of mins.!!
Two identical guitar strings are stretched with the same tension between supports that are not the same distance apart. The fundamental frequency of the higher-pitched string is 400Hz, and the speed of transverse waves in both wires is 200 m/s. How much longer is the lower-...
Wednesday, December 12, 2012 at 9:50pm by Kathy

physics
Received frequency shift (df): df/f = 2*(v/a) = 2*10/340 = 0.059 df = 150*.059 = 8.8 Hz Received frequency = 150 + 8.8 = 158.8 Hz Beat frequency = 158.8 - 150 = 8.8 Hz
Wednesday, January 16, 2013 at 7:34am by drwls

Physics
A sound of constant frequency is produced by the si-ren on top of a firehouse. Compared to the frequen-cy produced by the siren, what is the frequency heard by a firefighter approaching the firehouse? What if the firefighter is driving away?
Monday, March 11, 2013 at 4:46pm by Iris

Physics 11
A string that is 90cm long with a diameter of 0.75 mm and a tension of 60 N has a frequency of 100 Hz. What new frequency is heard when the length of the string is 100 cm long. Anyone help me please?
Wednesday, November 25, 2009 at 7:20pm by Andy

physical science
"Beats" require a mixing of two or more frequencies. You do not get beats "in" a single frequency. You get a regular back and forth oscillation of something. If 206 Hz is THE beat frequency of two added waves, then then the added intensity of the two waves ...
Friday, May 27, 2011 at 12:21pm by drwls

physics
a source of sound id traveling towards a stationary observer .The frequency of sound is heard by the observer is 25% more that the actual frequency.If the speed of sound is v,that of the source is options: 1.v/4 2.v/5
Sunday, June 17, 2012 at 5:22am by ashu

Physics
1. A train whistle has a frequency of 1000 Hz. If the train is speeding at a velocity of 60 km/h past a stationary railroad crossing attendant, what is the apparent frequency a) as the train approaches him, b) as it moves away from him? Assume speed of sound to be 350 m/s. 2. ...
Thursday, November 26, 2009 at 2:53pm by James

physics
A train at rest emits a sound at a frequency of 1089 Hz. An observer in a car travels away from the sound source at a speed of 30.7 m/s. What is the frequency heard by the observer? Assume the speed of sound in air to be 343 m/s.
Sunday, February 10, 2013 at 3:55pm by Anonymous

physics
a 333 hz and 337 hz tuning forks are struck simultaneously. whats will be the beat frequency?
Wednesday, May 30, 2012 at 12:00pm by Michael

Art History
Oh well I cannot provide you to a link but I can tell you that it is hymns. Considering that Gothic cathedrals were very ornate in nature they are I believe roman catholic or catholic at the very least. So start looking up some hymns, and these hymns were known to be spiritual...
Wednesday, October 3, 2007 at 9:44pm by Chii

phy
Doppler ultrasound is used to measure the speed of blood flow. If the speed of the red blood cells is v, the speed of sound in blood is u, the ultrasound source emits waves of frequency f, and we assume that the blood cells are moving directly toward the ultrasound source, ...
Friday, April 12, 2013 at 10:20pm by kira

physics
The "beat frequency" is 1/2.8 = 0.357 Hz. That is also how far the second string is off the desired 440 Hz.
Wednesday, February 10, 2010 at 5:42pm by drwls

physics
The speed of sound is higher by a factor sqrt(475/297) = 1.265 at the higher temperature. Frequency = (wave speed)/(wavelength) Fundamental wavelength will not change with T because it depends upon pipe length. If the cooler-air pipe has a fundamental frequency of 475 Hz, it ...
Friday, December 7, 2012 at 11:50pm by drwls

math
When at rest, two trains have sirens that emit a frequency of 300 Hz. The trains travel toward one another and toward an observer stationed between them. One of the trains moves at 30.0 m/s, and the observer hears a beat frequency of 3.6 beats per second. What is the speed of ...
Tuesday, April 2, 2013 at 10:25pm by lucy

physics
Two instruments are playing musical note "A" (440 Hz). A beatnote with a frequency of 2.5 Hz is heard. Assuming that one instrument is playing the correct pitch, what is the frequency of the pitch played by the second instrument?
Tuesday, February 1, 2011 at 12:17am by laila

Physics
At a factory, a noon whistle is sounding with a frequency of 480 Hz. As a car traveling at 85 km/h approaches the factory, the driver hears the whistle at frequency fi. After driving past the factory, the driver hears frequency ff. What is the change in frequency ff &#8722...
Tuesday, April 17, 2012 at 5:04pm by Armany

criminal justice
What is a beat? How does a beat compare to a post?
Friday, November 25, 2011 at 11:40am by kathy

english
How do I fix this sentence? As the beat of the song went up, we screamed loudly in order to match the beat.
Monday, October 25, 2010 at 10:03pm by Anonymous

Physics doppler effect
A radar device emits microwaves with a frequency of 4.73E+9 Hz. When the waves are reflected from a van moving directly away from the emitter, the beat frequency between the source wave and the reflected wave is 751 beats per second. What is the speed of the van? (Note: ...
Monday, May 16, 2011 at 7:39pm by Joan

English-Poetry
B is very correct. listen to the beat here: There go, my hearts content. Do you hear the beat, the cadence of the syllables?
Wednesday, September 14, 2011 at 8:15pm by bobpursley

Physics
Resonance in a system, such as a string fixed at both ends, occurs when a) it is oscillating in simpler harmonic motion b) its frequency is the same as the frequency of an external source c) its frequency is greater than the frequency of an external source d) its frequency is ...
Sunday, December 6, 2009 at 6:14pm by Satej

Physics
Light is an electromagnetic wave and travels at a speed of 3.00 108 m/s. The human eye is most sensitive to yellow-green light, which has a wavelength of 5.58 10-7 m. What is the frequency of this light? Ever heard of the equation (wavelength) x (frequency) = wave speed? Use ...
Thursday, April 26, 2007 at 11:09am by Mary

physics
F = Frequency as heard by receiver(man). V = Velocity of sound in air. Vr = Velocity of the receiver(man). Vs = Velocity of source(car). Fs = Frequency of source.
Sunday, December 2, 2012 at 1:51pm by Henry

Physics - Please Help
A 60 year old person has a threshold of hearing of 81.0 dB for a sound with frequency f=10,000 Hz. By what factor must the intensity of a sound wave of that frequency, audible to a typical young adult, (sound level=43.0 dB) be increased so that it is heard by the older person...
Monday, April 25, 2011 at 3:44pm by Emily

trig
At rest, the human heart beats once every second. At the strongest part of the beat, a person's blood pressure peaks at 120mmHg. At the most relaxed part of the beat, a person's blood pressure drops to 80mmHg. Supposing that t = 0 corresponds to the peak of the beat, ...
Monday, April 30, 2012 at 4:05am by Dave

physics help pleased
Two trains on separate tracks move toward one another. Train 1 has a speed of 125 km/h and train 2 a speed of 100.0 km/h. Train 2 blows its horn, emitting a frequency of 500 Hz. What is the frequency heard by the engineer on train 1? (Assume the speed of sound is 345 m/s.)
Friday, January 28, 2011 at 1:43pm by julie

Physics - Waves
My thinking is: f2=f1(V/V+Vs) f2=Heard frequency=394.3 Hz f1=Source frequency=400Hz V=velocity of sound in medium=332+0.6(23)=345.8 m/s Vs=velocity of source=5 m/s I'm not sure about the second question, though.
Sunday, February 1, 2009 at 7:03pm by Patrick

english editing (the rest))
"Yes I did" the turtle said. They went on arguing, and arguing the rabbit lost his mind; He got a stick, and start beating the turtles back shell. Break the shell all up. That is why the turtle has spots all over him. The Turtle was all beat up, broken back, and ...
Wednesday, November 30, 2011 at 1:29pm by Anonymous

Physics
You hear a beat produced by 2 sources: 342.6 and 351.8 Hz. What is the period of the resulting beat tone? -- is there a formula for this? If so what is it and how do you solve the question?
Sunday, June 5, 2011 at 6:20pm by Justin turner

Physics
The Doppler shift, delta f, of the blood cells moving away is 2 V/v_sound * 5.0 *10^6 Hz. V = 0.15 m/s = the blood cell speed and v_sound = 1540 m/s. The factor of 2 is there because the frequency is shifted twice (when received and when sent back). delta f = 2*5*10^6*0.15/...
Saturday, November 7, 2009 at 8:26pm by drwls

Physics
Standing waves are set up on two strings fixed at each end, as shown in the drawing. The two strings have the same tension and mass per unit length, but they differ in length by 0.55 cm. The waves on the shorter string propagate with a speed of 41.8 m/s, and the fundamental ...
Monday, November 30, 2009 at 3:32pm by Daniel

typos
sin p + sin q = 2 sin 197* 2 pit cos 3* 2 pi t so the beat signal is cos 3 * 2 pi t 6 The envelope frequency is therefore 3 Hz but we will hear a maximum of the 197 HZ signal twice per period of the envelope, thus we will hear the original difference frequency of 6 Hz
Wednesday, January 25, 2012 at 9:29pm by Damon

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