3 years ago

14.4% of what number is 10.4

1 answer:

8 0

First, convert "of" to x and put this info into an equation:

Let n represent the unknown number.

14.4 % x n= 10.4
n = 10.4 / 14.4%
n = 72.22222
n = ~72

Hope this helps!

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Plz answer the one in the left middle it goes along with the one right next to it.btw the top number in the pyramid says 72☺

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I hope this helps you

4 0

3 years ago

Help quick please!!!

jenyasd209 [6]

Answer:

168

Step-by-step explanation:

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2 years ago

What is the decibel level of the noise from a firecracker with intensity 10^-4 watts per square inch? Use a logarithmic model

vagabundo [1.1K]

Answer:

$\large \boxed{\text{110 db}}$

Step-by-step explanation:

The intensity β of a sound wave in decibels is given by the formula

$\beta = 10 \log \left (\dfrac{I}{I_{0}} \right)$

and I₀ = the reference intensity (10⁻¹² W/m²)

Data:

I = 10⁻⁴ W·in⁻²

Calculations:

1. Convert watts per square inch to watts per square metre

$\text{Sound level} = \dfrac{10^{-4}\text{ W}}{\text{1 in}^{2}} \times \left(\dfrac{\text{39.37 in}}{\text{1 m}}\right )^{2} = 1.5 \times 10^{-1} \text{ W$\cdot$m}^{-2}$

2. Convert the intensity to decibels.

$\beta = 10 \log \left (\dfrac{1.5 \times 10^{-1}}{1\times 10^{-12}} \right) = 10\log(1.5 \times 10^{11}) = 10 \times 11 = \textbf{110 db}\\\text{The sound intensity of the firecracker is $\large \boxed{\textbf{110 db}}$}$