4 years ago

2. A construction consultant may be responsible for

Physics

1 answer:

Brrunno [24]4 years ago

3 0

This is a tricky one but on my part I'd have to say depending on the contract A,B,C.

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1. What is the intensity of a sound when an observer is 10.0 m from the speaker

Nana76 [90]

Answer:

About 133 db.

Explanation:

Sound Intensity Level in db (SIL db) is equal to 10log (base 10) times the ratio of the sound intensity at 200 watts (I) relative to the sound intensity of the reference sound intensity (I sub 0), which by default is equal to 10⁻¹² W/m² or 0 dB.

I = 200 w / 10 m^2 = 20 w per square meter

I sub 0 = 10^-12 w per square meter

SIL = 10log ( I / I sub o) = 20 / 10^-12 = 10log ( 20^12) = 10 ( 13.3 ) = 133 db

Hope I typed this part correctly. Hard to get it in without being able to do exponents, etc. :D

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tatyana61 [14]

6.25 - 8 = -1.75

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What beat frequencies result if a piano hammer hits three strings that emit frequencies of 392.0, 587.3, and 146.8 hz? (enter yo

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128.1-127.8= 0.3Hz
129.1-128.1= 1.0Hz 
129.1-127.8= 1.3Hz

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You turn on your car's headlights while driving at night. What transformation is taking place?

Galina-37 [17]

Answer: C.

Explanation:

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3 years ago

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A stationary boat in the ocean is experiencing waves from a storm. the waves move at 56 km/h and have a wavelength of 160 m, bot

Lera25 [3.4K]

The wavelength $\lambda$ of the wave is 160 m, and this is the distance between two consecutive crests. The boat is located at a crest of the wave, this means that the first trough is located 80 meters from the boat (because the distance between a crest and a trough is half the wavelength).

The speed of the wave is
$v=56 km/h = 15.6 m/s$
so the time the boat takes to reach the first trough is
$t= \frac{S}{v} = \frac{80 m}{15.6 m/s}=5.1 s$

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4 years ago