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bezimeni [28]
3 years ago
5

Find the intensity of a 55 dB sound given lo-10-12 wm2

Physics
1 answer:
Inessa05 [86]3 years ago
7 0

Answer:

Intensity=I=3.16\times 10^{-7}\ W\ m^{-2}

Explanation:

Given:

\beta=55\ dB\\I_o=10^{-12}\ W\ m^{-2}

The sound level \beta in dB with intensity I

and reference intensity I_0 is given by:

\beta(dB)=10 \log_{10}(\frac{I}{I_0})

Plugging in values.

55=10 \log_{10}(\frac{I}{10^{-12}})

Dividing both sides by 10.

\frac{55}{10}=\frac{10 \log_{10}(\frac{I}{10^{-12}})}{10}

5.5=\log_{10}\frac{I}{10^{-12}}

The above can be written as

10^{5.5}=\frac{I}{10^{-12}}

Multiplying both sides by 10^{-12}

10^{5.5}\times 10^{-12}=10^{-12}\times \frac{I}{10^{-12}}

10^{(5.5-12)}=I

10^{(-7.5)}=I

∴ I=3.16\times 10^{-7}\ W\ m^{-2}

Intensity =I=3.16\times 10^{-7}\ W\ m^{-2}

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Water being turned into ice cubes in a freezer is an example of _____.
Gekata [30.6K]

Answer:

a physical change

Explanation:

after the water turns to ice, it will melt and became water again making which means it's reversible this being. a physical change

7 0
2 years ago
Read 2 more answers
The volume flow rate of the water supplied by a well is 2.0×10−4m3/s.The well is 40.0 m deep. (a) What is the power output of th
MaRussiya [10]

Answer:

a). P=78.4W

b). P=392kPa

c.) It must be at the bottom

Explanation:

Given:

Volume flow V_f=2.0x10^{-4}m^3/s

Well depp h=40.m

a.

The power output of the pum

W=F*d

F=m*g

m=p*V=1000kg/m^3*2.0x10^{-4}m^3}=0.2Kg

W=m*g*d=0.2kg*9.8m/s^2*40.0m=78.4kg*m^2/s^2

W=78.4J

P=\frac{W}{t}=\frac{78.4J}{1s}=78.4W

b.

The pressure of difference the pum

ΔP=p*g*y'

ΔP=1000kg/m^3*9.8m/s^2*40.0m=392x10^3Pa

P=392kPa

c.

It must be at the bottom since the pressure difference is greater than atmospheric pressure, so it wouldn't be able to lift the water all the way  

4 0
4 years ago
URGENTE ¿Cuál de los siguientes términos corresponde al concepto presión? * A. Es la fuerza perpendicular que ejerce un cuerpo s
melomori [17]

Answer:

Respuesta correcta, opción D: Es la fuerza que un cuerpo ejerce perpendicularmente sobre el área en la que actúa.

Explanation:

La definición de presión es la fuerza que un cuerpo ejerce en dirección perpendicular sobre el área en la que actúa.

Cuando se aplica una fuerza sobre la superficie de un cuerpo, la presión es la siguiente:

P = \frac{F}{A}

En donde:

F es la fuerza aplicada.

A es el área del cuerpo.  

Por lo tanto la opción correcta es la D: es la fuerza que un cuerpo ejerce perpendicularmente sobre el área en la que actúa.

Espero que se sea de utilidad!      

6 0
3 years ago
What is the kinetic energy of an object that has a mass of 50.0 kg and a velocity of 18 m/s? A.450 J B.900 J C.8,100 J D.16,000
Svet_ta [14]
KE = (1/2)·(mass)·(speed)²

KE = (1/2)·(50 kg)·(18 m/s)²

KE = (25 kg)·(324 m²/s²)

KE = 8,100 kg-m²/s²

KE = 8,100 Joules
5 0
3 years ago
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What are 2 things that effect work on an object
uysha [10]
Force and Gravity, is what i think it is.
4 0
3 years ago
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