1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Taya2010 [7]
3 years ago
6

A vacuum cleaner produces sound with a measured sound level of 75.0 dB. (a) What is the intensity of this sound in W/m2? W/m2 (b

) What is the pressure amplitude of the sound?
Physics
1 answer:
jonny [76]3 years ago
5 0

Answer:

Part a)

I = 3.16 \times 10^{-5} W/m^2

Part b)

P_o = 0.162 Pa

Explanation:

Part a)

Level of sound = 75 dB

now we know that

L = 10 Log\frac{I}{I_0}

here we know that

I_0 = 10^{-12} W/m^2

now we have

75 = 10 Log(\frac{I}{10^{-12}})

I = 3.16 \times 10^{-5} W/m^2

Part b)

Intensity of sound wave is given as

I = \frac{1}{2}\rho A^2\omega^2 c

here we know that

A = \frac{P_o}{Bk}

so we have

I = \frac{1}{2}\rho(\frac{P_o}{Bk})^2\omega^2 c

I = \frac{1}{2}\rho P_o^2 \frac{c^3}{B^2}

now we know

\rho = 1.2 kg/m^3

c = 340 m/s

B = 1.4 \times 10^5 Pa

now we have

3.16 \times 10^{-5} = \frac{1}{2}(1.2)P_o^2\frac{340^3}{(1.4\times 10^5)^2}

P_o = 0.162 Pa

You might be interested in
The most common listening problem is
djverab [1.8K]
I think the correct answer is C
7 0
3 years ago
Bacteria which do not live in extreme conditions are found in this kingdom:
ruslelena [56]
The bacteria that doesn’t live in extreme conditions is Eubacteria
6 0
2 years ago
Read 2 more answers
An apple falls from an apple tree growing on a 20° slope. The apple hits the ground with an impact velocity of 16.2 m/s straight
EleoNora [17]

Apple hits the surface with speed 16.2 m/s

The angle made by the apple velocity with normal to the incline surface is given as 20 degree

now the component of velocity which is parallel to the surface and perpendicular to the surface is given as

v_{perpendicular} = v cos20

v_{parallel} = v sin20

so here we have

v_{parallel} = 16.2 sin20

v_{parallel} = 5.5 m/s

<em>so its velocity along the incline plane will be 5.5 m/s</em>

7 0
3 years ago
Q.Solve the following circuit find total resistance RT. Also find value of voltage across resister RC.
Drupady [299]

Answer:

14.57 ohms

Explanation:

Here in the figure ,Rb & R₄are in series  & also  Rc & R₅ are in series. As they are in series , ( Rb + R₄ ) & (Rc & R₅) are in parallel . So the equivalent resistance in that branch = ( 2 + 18 ) ║ ( 3 + 12 )

                                          = 20 ║ 15

                                          = (20×15) / (20 + 15)

                                          = 8.57 ohms

Also Ra ( 6 ohm ) is in series with that branch ,. So the equivalent resistance of the whole circuit = 8.57 + 6 = 14.57 ohms.

5 0
2 years ago
A dog of mass 18 kg runs at a speed of 4 m/s. What is the momentum of the
Andrej [43]

Answer:

A, 72 kg•m/s

Explanation:

p=mv

p=18x4

p=72

6 0
3 years ago
Other questions:
  • Tailor your business to aim your product or service at a certain group of customers, who are called the
    14·1 answer
  • What is the difference between the organic material from which coal forms and the organic material from which petroleum and natu
    15·1 answer
  • Kevin works for his own gutter and siding company and loves that he gets to climb around and work outside. marsha is an accounta
    9·1 answer
  • A wire 6.90 m long with diameter of 2.15 mm has a resistance of 0.0320 Ω. Find the resistivity of the material of the wire. rho
    7·1 answer
  • Assuming Luke has a mass of 90Kg how much potential energy does he have just as he leaves the plane 7620 meters up? Explain how
    10·1 answer
  • If a bicyclist is traveling at 40.0 km/hr for 2.5 hrs. How far does he travel?
    10·2 answers
  • Name two hormones produced by the endocrine system and how they work with other organs system to maintain homeostasis
    9·1 answer
  • An elephant pushes with 2000 N on a load of trees. It then pushes these trees for 150 m. How much work did the elephant d
    6·1 answer
  • Convert the following to gram. a,250 kg b373 mg c,10 quanital,15 ton​
    7·1 answer
  • A Carnot engine performs 2.5 * 104 J of work in each cycle and has an efficiency of 66%. (a) How much heat does the engine extra
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!