حل واجبات فيز 102 ترم 113

Ch17_Lec2_Q1
(Points: 1)




You are listening to an “A" note played on a violin string. Let the subscript “s" refer to the violin string and “a" refer to the air. Then:



a. fs = fa and λs = λa

b. fs = fa and λs ≠ λa

c. λs = λa and fs ≠ fa

d. λs ≠ λa and fs ≠ fa

e. linear density of string = volume density of air







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2. Ch17_Lec2_Q2
(Points: 1)




In the figure below, sound with a 27.0 cm wavelength travels rightward from a source and through a tube that consists of a straight portion and a half-circle. Part of the sound wave travels through the half-circle and then rejoins the rest of the wave, which goes directly through the straight portion. This rejoining results in interference. What is the smallest radius r (in cm) that results in an intensity minimum at the detector? (Give your answer in three significant figures form)





Answer







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3. Ch17_Lec2_Q3
(Points: 1)




Two sounds differ in sound level by 5.78 dB. What is the ratio of the greater intensity to the smaller intensity? (Give your answer in three significant figures form)

Answer







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Question one is B

And the second queation. Use this equation
pi*r-2r=lambda /2
Where lambda is he wave length

You can take common factor but i couldnt wrote it properly because of the i pad

Im working on the last qeuation because it has logirthm and the keyboard ia really messed up

 

Q3. Simply use this relation:
B2 - B1 = given number x; where B is sound level
x = 10 log(I2/I1) then divide by 10
x/10 = log(i2/I1) then take 10 power the last equation for both sides to get rid of log
I2/I1 =
10^(x/10) (عشرة أس الرقم المعطى مقسوم على 10)
thats your final answer. for short substitute x for the given number and thats the desired answer

 

^^

i guess it should be10^(x\10) dont you think so ?

 

^
بالضبط. اقرأها من اليمين إلى اليسار.. ما رضت تطلع معي من اليسار إلى اليمين لهذا كتبتها بالعربي تفادياً لأي التباس ممكن. شكراً للتنبيه وبأحاول أعدلها حتى محد يختلط عليه الأمر.

تعديل: للأسف انتهت مدة تعديل الرد. : (

 

In the figure below, sound with a 49.3 cm wavelength travels rightward from a source and through a tube that consists of a straight portion and a half-circle. Part of the sound wave travels through the half-circle and then rejoins the rest of the wave, which goes directly through the straight portion. This rejoining results in interference. What is the smallest radius r (in cm) that results in an intensity minimum at the detector? (Give your answer in three significant figures form)

الجواب 216

صح ؟

 

Two sounds differ in sound level by 1.90 dB. What is the ratio of the greater intensity to the smaller intensity? (Give your answer in three significant figures form)

الجواب 1.55
صح ؟

 

^^^^^^
صح

 

شكرا عزيزي

 

make sure

i think you have a mistake in the second question

because we are not supposed to change the unit

 

Two pipes are each open at one end and closed at the other. Pipe A has length L and pipe B has length 2L. Which harmonic of pipe B matches in frequency the fundamental of pipe A?



a. The fundamental.

b. The second

c. The third

d. The fourth

e. None of the above


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2. Ch17_Lec3_Q2 (Points: 1)
An ambulance with a siren emitting a sound at An ambulance with a siren emitting a whine at 1,592 Hz passes by a cyclist pedaling a bike at 1.00 m/s. After being passed by the ambulance, the cyclist hears a frequency of 1,570 Hz. How fast is the ambulance moving in m/s? Take the speed of sound to be 343 m/s. (Give your answer in three significant figures form)

Answer


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3. Ch17_Lec3_Q3 (Points: 1)
A police car with failed brakes is moving towards a wall at a speed of 68.4 km/h while emitting a sound at frequency of 613 Hz. The sound is reflected from the wall back to policeman in the police car. What is the frequency (in Hz) of the sound heard by the policeman? Take the speed of sound to be 343 m/s. (Give your answer in three significant figures form)

 

^^^
السؤال الاول : E

السؤال الثاني: 5.82

السؤال الثالث: 647

___________________________________________
هذا اللي اقدر عليه وانشاء الله انها صح

 

An ambulance with a siren emitting a sound at An ambulance with a siren emitting a whine at 1,625 Hz passes by a cyclist pedaling a bike at 1.23 m/s. After being passed by the ambulance, the cyclist hears a frequency of 1,570 Hz. How fast is the ambulance moving in m/s? Take the speed of sound to be 343 m/s. (Give your answer in three significant figures form)

 

1. Ch18_Lec1_Q1
(Points: 1)
Objects A and B are made of different materials and are initially at different temperatures TA and TB, respectively. We place objects A and B inside an insulating container and make them in contact with each other. If we wait enough time until thermal equilibrium is reached. Then, according to the zeroth-law of thermodynamics objects A and B:



a. Will reach the same final temperature Tf which is lower than TA and lower than TB.

b. Will have a final temperature Tf which is equal to TA.

c. Will have a final temperature Tf which is equal to TB.

d. Will have the same final temperature even if they are made of different materials.

e. Will not be at the same temperature because they are made of different materials

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2. Ch18_Lec1_Q2
(Points: 1)
At what temperature (in Celsius) is the Fahrenheit scale reading equal to 0.557 times that of the Celsius scale? (Give your answer in three significant figures form)

Answer

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3. Ch18_Lec1_Q3
(Points: 1)
Find the change in volume (in cm3) of an aluminum sphere with an initial radius of 5.49 cm when the sphere is heated from 0.0°C to 88.9°C. Take the coefficient of volume expansion of the aluminum to be 23x10-6 /°C. (Give your answer in three significant figures form)

Answer

 

في السؤال الثالث نضرب معامل الألومنيوم بـ 3 أو لا؟

 

Ch18_Lec1_Q2 (Points: 1)
At what temperature (in Celsius) is the Fahrenheit scale reading equal to 1.796 times that of the Celsius scale? (Give your answer in three significant figures form)

حليت السؤال وطلع الاجابة 8000
حولت
8000c to 14432f
قسمت
14432/8000 طلع لي
1.804
المفروض يطلع لي نفس الرقم الي في السؤال
طريقة الحل
f=1.796c
ونعوض في المعادلة التالية
f=9/5c+32

 

Find the change in volume (in cm3) of an aluminum sphere with an initial radius of 7.83 cm when the sphere is heated from 0.0°C to 50.3°C. Take the coefficient of volume expansion of the aluminum to be 23x10-6 /°C. (Give your answer in three significant figures form)

2.33
صح؟

 

Ch18_Lec2_Q1 (Points: 1)
An object gained and lost energy in the form of heat. If the heat gained is 14.8 cal and the heat lost is 13.7 cal. What is the net heat gained by the object in joules? (Give your answer in three significant figures form)

Answer


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2. Ch18_Lec2_Q2 (Points: 1)
A 197 g of silver is initially at 16.9°C. Find the minimum amount of energy, in joules, required to completely the silver. Given that silver has a specific heat of 236 J/kg.K and melts at 1235 K. (Hint: use the heat of fusion Lf for silver in table 18-4, page 487 in the text book) (Give your answer in three significant figures form)

Answer


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3. Ch18_Lec2_Q3 (Points: 1)
What mass of steam at 100°C must be mixed with 150 g of ice at its melting point, in a thermally insulated container, to produce liquid water at 51.3°C? (Hint: use the specific heat of ice and water in table 18-3, page 485. And use the latent heat of fusion Lf for ice in table 18-4, page 487 in the text book) (Give your answer in three significant figures form)

 

تكفون الواجب بقفل الاجوبه للاسئله اللي فووووووووق ^^^^^^^

 

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