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3 years ago

Scientific knowledge

Physics

2 answers:

Dennis_Churaev [7]3 years ago

7 0

Answer:

The answer is D. i got this off of study island

Explanation:

Hope this helps!

emmasim [6.3K]3 years ago

6 0

Answer:

Explanation:

As we progress and learn more, scientists make new discoveries that can contradict earlier discoveries, and since are technology is better today we are able to discover a lot more to add to or change our previous theories.

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A substance has density ρ, mass m, and volume V. If the volume is tripled, what is the new mass?

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Since the density of the substance is ρ (rho),

==> every cm³ of this substance has ρ grams of mass.

Then

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and

==> 3V cm³ of it has 3ρV grams of mass. That's ' 3m '.

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dezoksy [38]

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Help with 5 and the question below. BRAINLIEST FOR THE CORRECT ANSWER! Urgent Physics help!

krok68 [10]

Sound level at distance of 15 m is given as 20 dB

so intensity at this distance is given as

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

$20 = 10 Log{I}{10^{-12}}$

$I_1 = 10^{-10}W/m^2$

now if we move closer to some some distance the sound level is now 50 dB

now the intensity is given as

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

$50 = 10Log\frac{I}{10^{-12}}$

$I_2 = 10^{-7}W/m^2$

now we know that

$\frac{I_1}{I_2} = \frac{r_2^2}{r_1^2}$

$\frac{10^{-10}}{10^{-7}} = \frac{r_2^2}{15^2}$

$r_2 = 47 cm$

so now the distance from friend must be 47 cm

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2 years ago

I forgot to write also put drawings on my theory questions

11Alexandr11 [23.1K]

Hi love hope you had an amazing day! you’re beautiful!!

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