a loudspeaker on a tall pole broadcasts sound waves equally in all directions. part a what is the speaker’s power output if the sound intensity level is 112 db at a distance of 20 m ?

Answers

Answer 1

The power output of the speaker is 15.8 watts (W).

We can use the relationship between sound intensity level and power to calculate the speaker's power output. The sound intensity level (SIL) in decibels (dB) is given by:

SIL = 10*log(I/I0),

where I is the sound intensity and I0 is the threshold of hearing (10⁻¹² W/m²).

At a distance of 20 m, the sound wave has spread out over an area of:

A = 4πr² = 4π*(20 m)² = 5026 m²

Since the speaker broadcasts sound waves equally in all directions, the sound intensity at a distance of 20 m is:

I = P/A,

where P is the power output of the speaker.

Substituting the given values, we have:

112 dB = 10*log(P/(10⁻¹² W/m²))    (using SIL = 112 dB)

11.2 = log(P/(10⁻¹² W/m²))

P/(10⁻¹² W/m²) = 10¹¹

P = (10⁻¹² W/m²)*10¹¹

P = 15.8 W

Therefore, the speaker's power output is 15.8 watts (W).

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Related Questions

Some one plz help me I am so confused

Answers

Answer:

1. the attractive force that holds atoms or ions together

2. the average distance between the nucleus of two bonded atoms

3. the angle formed by two bonds to the same atom

Mary takes a trip to California for her vacation. Her airplane leaves Boston and flies 3,000 miles west, arriving in San Francisco 6 hours later. What was the plane’s velocity? Calculate and include proper units!

Answers

Answer:

two hr lead =90 miles

90/15=6hrs

2+6=8pm

Explanation:

Each external force acts on the system for 10 seconds. Rank the change in momentum of each of the cart-cart systems from largest to smallest. (The label of “m” or “2 m” desginates the relative mass of each cart.)

It is possible to have some of the categories below BLANK since you may have items that are EQUAL to each other.
Put the largest as far up as you can, and the smallest as far down as you can

Answers

Answer:

thanks me later

PLEASS MARK ME AS BRAINLIEST ANSWER

What is the displacement of a car in 50 s if it is travelling with a velocity of 25 m/s?

Answers

Answer:

v =25 m/s

time= 50 s

Velocity =Displacement/Time

Displacement = Velocity × Time

S = 25×50

s=1250m

Explanation:

v =25 m/s

time= 50 s

Velocity =Displacement/Time

Displacement = Velocity × Time

Can somebody plz help me with this one the question is in the screen shot.

Answers

this is in order.

LANDFILL

GROUNDWATER

PESTICIDE

FERTILIZER

HAZARDOUS WASTE

SEPTIC SYSTEM

SEEPAGE

work out

A rectangular block of mass 20 kg lies with a side 0.2m by 500cm on a tab
What is the pressure exerted by its weight on the table?​

Answers

Explanation:

force/area=pressure

force=10*mass

area=0.2*500

pressure=200/100=2

Which angle allows the soil to receive the most direct light from the lamp?
0 degrees
20 degrees
45 degrees
90 degrees

Answers

D. 90 degrees

Hope this helped !

Answer:

D. 90 degrees

Explanation:

just finished lab

Alice pulls her wagon with a force of 75N. If the she pulls the wagon for 50 meters, how much work has she done?

Answers

Answer: W=75.50J

Explanation:

W=Fd

A block of mass 0.5kg is pulled to the right with an applied force 3N at an angle 30 degrees above horizontal as shown. Ignoring friction, the acceleration of the block is...
A. 1.8
B. 3
C. 5.2
D. 6​

Answers

The answer is C, 5.2

Mr. Rosa sees a random flying object headed towards his student’s face. He sprints at 13 m/s in 2 seconds. How fast did Mr. Rosa accelerate to save his student?
What is your known?
What is your unknown?
Plug it in.
What is your answer?

Answers

Answer:

13m/s

Explanation:

actually the answer is already given the thing which is not given is the distance which is 26 m which Mr Rosa walked it in 2 secs

hope it helps you

please mark me as brainlist

Physics mcq please be sure​

Answers

Answer:

1. c 2.d

Explanation:

we did this in middle school

skills needed in agawang panyo

Answers

Answer:

they are;at first its teamwork,then agility and quick thinking

The biological levels of organization range from a single organelle all the way up to the biosphere in a highly structured hierarchy. Your lab partner is struggling to understand the interaction between the levels in the biological hierarchy. Using the model, what explanations can your offer to help your classmate? Choose ALL that apply.
A) R makes up Q which makes up P which makes up S.
B) Cells that work together make up tissues, which comprise organs.
C) Similar cells working together make up organs which make up organ systems.
D) In the model, the animal cells make up tissues such as muscle or connective tissue.
E) Organs, such as the stomach and intestines, make up organ systems which interact with one another to maintain homeostasis.

Answers

The model that depicts the concept of biological levels of an organization which is ranging from single organelle to biosphere is explained by all the options given except for options A and C.  

Biology is specifically the study that deals with various forms of life. Since life is considered a vast topic, scientists classified this broad system into different organizational levels for better understanding.

The Biological levels of the organization are described as follows:  

The biological level of organization of any living form is depicted and arranged from the simplest forms to the complex ones and thus, the order tends to start from organelles to the biosphere. The elaborated levels are in ascending order as organelles, cells, tissues, organs, organ systems, organisms, populations, communities, ecosystem, and biosphere respectively. Each level tends to combine with one another to give rise to the next level. One such example is that the cells that tend to work together make up the tissues, which further comprise the organs. Similarly, organ systems are formed by the interaction between certain organs in order to maintain homeostasis.

Considering all these facts, option C represents the statement that is incorrect as the cells cannot directly form organs without forming tissues and the letters in option A is not specific. And thus, we can conclude that except for options A and C, all the other options correctly depict the model of the Biological levels of the organization.

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Sound will travel slowest through which medium?

Answers

Ice at -25
Hope this helps
May God bless you and your family

what different forms of energy are demonstrated by tv remote, flashlight, string lol ights, clock, and Toys​

Answers

Answer:

I hope it helps you

Explanation:

please mark me as brainllest answer please

Solve this question I don't get it

Answers

Answer:

idek

Explanation:

What are the half lives for uranium-235 and uranium-238?
a.
The half-life of uranium-235 is 713 seconds, the half-life of uranium-238 is 4.5 minutes
c.
The half-life of uranium-235 is 713,000,000 years, the half-life of uranium-238 is 4,500,000,000 years
b.
The half-life of uranium-235 is 713 days, the half-life of uranium-238 is 450 days
d.
None of the above

Answers

Answer:

C. The half-life of uranium-235 is 713,000,000 years, the half-life of uranium-238 is 4,500,000,000 years

Which of the following is a variable property for a gas? Select all that apply.

shape
mass
volume
density

Answers

Answer:

volume

Explanation:

mass density and shape are not variable to my view.

pressure volume

number of moles and temperature are variable

5. Identify the reactants in this chemical equation:
2H3PO4 → HAP20, +H2O

Answers

Answer:

H=Hydrogen, PO4=Phosphate

Explanation:

Reactions are on the left side of arrow and products are on the right side of arrow.

What would the acceleration of a car be from a stoplight if it started at 0 m/s and reached a
speed of 100 m/s in 7.8 seconds?

Answers

Answer:

The acceleration of a car would be:  [tex]a=12.8[/tex] m/s²

Explanation:

Given

Initial velocity = [tex]v_1=0[/tex] m/s

Final velocity = [tex]v_f=100[/tex] m/s

Time elapsed = [tex]t = 7.8[/tex] s

To determine

We need to determine the acceleration of a car.

We know that acceleration is basically the rate of change in velocity over time.

Thus,

We can determine the acceleration using the formula

[tex]\:\:\:a=\:\frac{v_f-v_i}{t}[/tex]

where

[tex]a[/tex] is the acceleration[tex]v_1[/tex] is the initial velocity[tex]v_f[/tex] is the final velocity[tex]t[/tex] is time elapsed

now substituting the values [tex]v_1=0[/tex],  [tex]v_f=100[/tex], and [tex]t = 7.8[/tex] in the formula

[tex]\:\:\:a=\:\frac{v_f-v_i}{t}[/tex]

[tex]a=\:\frac{100-0}{7.8}[/tex]

[tex]a=\frac{100}{7.8}[/tex]

[tex]a=12.8[/tex] m/s²

Therefore, the acceleration of a car would be:  [tex]a=12.8[/tex] m/s²

An instant soup is very low in fat and calories but high in sodium. Can this food be labeled “ healthy”?

Answers

Answer:

no

Explanation:

it is not healthy because sodium is not good to our body

No it is not healthy.

The following information should be considered:

The instant soup is the processed food and it have the expire time of about 6 months.If we make the soup homemade than it will be okay for only 1 or 2 foods. Also it is high in sodium.

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Will mark as brainliest !! plz answer it

Plzzz answer with explnation!!!

the value of acceleration due to gravity (g) will be maximum at:
.
a) 1/2 of the radius of earth

b) 1/4 of the radius of earth

c) 1/8 of the radius of earth

Answers

I answered first on your other comment!

What characteristic is necessary for the uranium in a nuclear reactor?

Answers

Answer:

U-235

Explanation:

a rare needed compound

Which type of protist is animal AND plant like?

Answers

Answer:

Protists are called plant-like, fungus-like and animal-like because they share some of the characteristics of plants, fungi and animals, even though they belong in a different category: the kingdom Protista.

Explanation:

Assignments
1. A shopper pushes a grocery cart 20.0 m at constant speed on level ground, against a 35.0 N
frictional force. He pushes in a direction 25.0" below the horizontal. (a) What is the work done
on the cart by friction? (b) What is the work done on the cart by the gravitational force? (c)
What is the work done on the cart by the shopper? (d) Find the force the shopper exerts, using
energy considerations. (e) What is the total work done on the cart?​

Answers

Hello there!

I hope you and your family are staying safe and healthy during this unprecendented time.

A) What is the work done?

Answer: We need to use the formula

[tex]w=-F_f(d)[/tex]

[tex]w=-(35)(20)[/tex]

[tex]w=-700J[/tex]

B) What is the work done on the cart by the gravitational force?  

Alright, we know that the gravitional force is perpendicular to the diplacement. Therefore, we gonna use the following formula:

[tex]w=Fdcos90[/tex]

[tex]w=0[/tex]

C) What is the work done on the cart by the shopper?

This is the easier part, since we already know that the work done by the shopper is the same as the work done by the friction force

[tex]W shopper + W friction = 0\\W shopper = W-friction \\W shopper = 700J[/tex]

D) Find the force the shopper exerts, using energy considerations.

[tex]F_f+Fcos25=0\\-35+Fcos25=0\\F=38.6N[/tex]

E) What is the total work done?

You just need to add them:

[tex]w=wshopper+wfriction\\w=0[/tex]

A wave hits an object as shown. A vertical line with Medium 1 to the left and Medium 2 to the right. An arrow from the left reaches the line. An arrow starts from the same point on the line and goes right at a different angle. Which kind of wave interaction is shown?

Answers

Answer:

refraction

Explanation:

When the wave moves from medium 1 to medium 2, then the wave gets refracted. Then the correct option is C.

What is the wave?

A wave is an energetic disturbance in a medium that doesn't include any net particle motion. Elastic deformation, a change in pressure, an electric or magnetic intensity, an electric potential, or a change in temperature are a few examples.

A wave is a dynamic disturbance of one or more variables that propagates in physics, geometry, and related sciences. When waves oscillate frequently around an equilibrium value at a certain frequency, they are said to be periodic.

The bending of waves as they go from one substance to another is known as wave refraction. It bends when the wave enters a new material because the wave's speed changes. The optical density or index of refraction of the material affects how light waves bend.

Thus, the correct option is C.

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The missing options are given below.

absorption

diffraction

refraction

reflection

True or False:
Sensations of heaviness and lightness are always associated with changes in a person's weight. A person who feels light has lost weight and a person who feels heavy has gained weight.

If False, explain why the statement is false.

If True, explain why the statement is true.

Answers

False, you can feel heavy but not gain weight

It's not true, no. The weight can be used to calculate an object's product of mass, but not gravity. The object's mass is multiplied by gravity, as is evident. However, an object's mass will never be 0 and will always be constant, its weight would be zero if there is no gravity. Since mass and weight are not the same, the assertion is untrue.

What is Weight?

Weight is the gravitational pull of a large second object, thus the Moon or the Earth, at the first object. Weight is a result of the universal law of gravity, according to which any two objects will gravitationally pull one another with a force exactly equal to the applied of their masses and divided by the square of a distance separating them.

Because of this, larger items naturally weigh more when placed in the same spot; yet, the farther any object seems to be from the Earth, the less weight it has.

Because of the tiny difference in size between the polar and equatorial radii of the Earth, an object's weight at the South Pole is somewhat higher than its value at the Equator.

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Blake strikes a punching bag with 80N of force for 0.05 seconds. John strikes a
punching bag with 60N of force for 0.1 second. Who delivers a greater amount of
impulse?

Answers

Answer:

So impulse= force × timeP1= 80N× 0.05 = 4 P2= 60N × 0.1= 6 Hence John delivers a greater impulse I do exams and quizzes if your interested



The seed planted at extreme cold or in the region of frozen ice do not germinate, why?​

Answers

Answer:

yes

The the seed planted at Extreme cold or in the region of frozen I did not germinate because the amount of moisture of the seed is too high which results in lack of air of the sea in the frozen ice

In fact, a soil temperature below 50°F might be problematic for many garden plants. Seeds will quickly absorb water at 40°C, but they won't begin to grow. This presents a risk for rot and disease, which may cause damping-off or subpar growth.

What is germination of seed?

The formation of the seedling is the consequence of germination, which is often the growth of a plant inside a seed. It is also the process of the seed's metabolic machinery being reactivated, which causes the radicle and plumule to emerge. A vascular plant's seed is a little bundle that develops in a fruit or cone as the result of the union of the male and female reproductive cells.

Given the need for particular internal or external stimuli to resume growth, dormant seeds are viable seeds that do not germinate. When the right circumstances are present, the seed starts to germinate and the embryo starts to grow again, eventually becoming a seedling.

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A person does 15 J of work moving a couch 1.3 m. How much force was used?​

Answers

Answer:

11.53 N.

Explanation:

Work = Force * Displacement

W= 15 J

D = 1.3

And now you solve for Force.

15= 1.3F

F= 11.53 N

Other Questions
What should be used to block attacks against websites? NAT gateways Machine learning technologies Index technologies Intrusion detection system Application firewall (Exercise 4.12) This exercise is intended to help you understand the cost/complexity/ performance trade-offs of forwarding in a pipelined processor.Problems in this exercise refer to pipelined datapaths from Figure 4.45. These problems assume that, of all the instructions executed in a processor, the following fraction of these instructions have a particular type of RAW data dependence. The type of RAW data dependence is identified by the stage that produces the result (EX or MEM) and the instruction that consumes the result (1st instruction that follows the one that produces the result, 2nd instruction that follows, or both).We assume that the register write is done in the first half of the clock cycle and that register reads are done in the second half of the cycle, so "EX to 3rd" and "MEM to 3rd" dependences are not counted because they cannot result in data hazards. Also, assume that the CPI of the processor is 1 if there are no data hazards. Assume the following latencies for individual pipeline stages. For the EX stage, latencies are given separately for a processor without forwarding and for a processor with different kinds of forwarding.4.1 [5] If we use no forwarding, what fraction of cycles are we stalling due to data hazards?4.2 [5] If we use full forwarding (forward all results that can be forwarded), what fraction of cycles are we staling due to data hazards? unstructured observation is much more likely to be used in which kind of research? given the following equation, h2o(g) co(g) h2(g) co2(g) grxn = -28.6 kj calculate grxn for the following reaction. 4 h2o(g) 4 co(g) 4 h2(g) 4 co2(g) consider the balanced chemical equation: 3 h(g) n(g) 2 nh(g) if 46.8 g h and 179.4 g n are mixed to form nh, which of the following substances is the limiting reactant? prison discipline was used to control inmates and sometimes lead to mental/emotional/physical illness, and in some cases death.T/F Write an integral that quantifies the change in the area of the surface of a cube when its side length triples from s unit to 3s units. for her personal training business shapeup!, veronica jackson has decided to work on developing and maintaining positive relationships with the media and community groups. veronica is focusing on a(n) [-----] strategy. you borrow $830 from your brother and agree to pay back $880 in 5 months. what simple interest rate will you pay We have good reason to the _____________ truth of particular claims when the experts disagree about whether or not they are true.a. deny b. query laypersons about c. stay undecided about d. belie e. endorse relaxin is a hormone produced by the placenta and ovaries. the function of this hormone is to ________. 2. Which of the following types of analysis would a Fundamental Analyst use?A. Historical trading volumesB. Historical stock price movementsC. Trends in trading patternsD. The crowds psychology and emotions in a small organization (cafe, service station, or real estate office), supervision of employees and management control are most commonly done through if you crinkle your nose in response to a bad smell, what cranial nerve(s) is(are) you using TRUE / FALSE. in a high consensus culture, employees disagree about the way things are supposed to happen. Report the individual concentration in [M] of Tartrazine and Sunset Yellow in the sample.Certificate of Analysis Purities:Tartrazine (M.W. 534.36): 89.0% (Calculated from Carbon, Nitrogen Analysis)Sunset Yellow (M.W. 452.37): 96.2% (By HPLC)Weight of Standards:Tartrazine: 0.1006 GmSunset Yellow: 0.1000 GmAbsorbances: 427 nm 4 81 nmTartrazine: 0.936 0.274Sunset Yellow: 0.414 0.956Sample: 0.539 0.409Data AnalysisDetermine the weight of Tartrazine or Sunset Yellow in the standards by multiplying the weight of standard recorded by the fraction of compound indicated from the Certificate of Analysis (the percent divided by 100).Determine the moles of Tartrazine or Sunset Yellow in the standards by dividing the weights determined in step (1) by the molecular weights of the compounds (Tartrazine has a molecular weight of 534.36 g/mol, Sunset yellow has a molecular weight of 452.37 g/mol)Determine the molarity of the compounds by dividing the moles of compound weighed by the volume in liters the compounds were diluted to (0.100 L in this case).Multiply the molarity above by any dilutions that were applied, which this case is 2/100.These are the concentration of the standard solutions in M (mol/L).Calibration: Calculate the molar absorptivity at each wavelength for each analyte by dividing the absorbance value at each wavelength for a given analyte by the concentration of that analyte. This will result in four molar absorptivity coefficients.1(427)=(427)/1 stand2(427)=(427)/2 stand1(481)=(481)/1 stand2(481)=(481)/2 standReference Solution Evaluation: Using the calibrated values from above, and using the reference solution absorbance values at the two max wavelengths, solve the two equations for the molar concentrations of the Tartrazine (C1) and Sunset Yellow (C2) below.(1) Total(ref) (427)= 1(427)1 ref + 2(427)2 ref(2) Total(ref) (481)= 1(481)1 ref + 2(481)2 refIf the reference concentrations are within 5% of their actual values then the linearity of the calibration and the non-interference and independence of the spectra has been sufficiently verified.Unknown Solution Determination: As described in the Introduction section, solve the following simultaneous equations for the concentrations of FD&C 5 and FD&C 6 in your unknown sample:Total(sample)(427)= 1(427)1 sample + 2(427)2 sampleTotal(sample)(481)= 1(481)1 sample+ 2(481)2 sampleSubstitution of the absorbances for the samples mixture (Total (427) and Total (481)) into the above equations along with the four values from the calibration step, provided two simultaneous equations with two unknowns, 1 sample and 2 sample for FD&C 5 and FD&C 6. Apply simple algebra to determine the mathematically resolved values of 1 sample and 2 sample for the compounds FD&C 5 and FD&C 6. Darwing and before him not know about genetics. The theory of how traits showed up in offspring of the 1700s ans 1800s was one of?Blended inheritancePrimary inheritanceMale only inheritanceNo inheritance A certain population follows a normal distribution with mean and standard deviation =1.2. You construct a 95% confidence interval for and find it to be 1.10.8. Which of the following is true?A. We would reject H0: =1.1 against Ha: 1.1 at =0.05.B. We would reject H0: =2.4 against Ha: 1.4 at =0.01.C.We would reject H0: =2.4 against Ha: 2.4 at =0.05.D.We would reject H0: =1.2 against Ha: 1.2 at =0.05. To which family does the function y=(x 2)1/2 3 belong? a: quadratic b: square root c: exponential d :reciprocal a nurse is providing care for a child with disseminated intravascular coagulation (dic). what would alert the nurse to possible neurologic compromise?