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2 years ago

What is sliding friction?

Physics

2 answers:

olga2289 [7]2 years ago

8 0

Answer:

I think the answer would be B

Explanation:

Hope this helps:)...if it's wrong I'm sorry for wasting your time and may God bless you:)

Oksi-84 [34.3K]2 years ago

7 0

Answer:

a wait yes a or no? I don't hehe

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The intensity at distance from a spherically symmetric sound source is 100 W/m2. What is the intensity at five times this distan

ss7ja [257]

To solve this problem it is necessary to apply the concepts related to intensity as a function of power and area.

Intensity is defined to be the power per unit area carried by a wave. Power is the rate at which energy is transferred by the wave. In equation form, intensity I is

$I = \frac{P}{A}$

The area of a sphere is given by

$A = 4\pi r^2$

So replacing we have to

$I = \frac{P}{4\pi r^2}$

Since the question tells us to find the proportion when

$r_1 = 5r_2 \rightarrow \frac{r_2}{r_1} = \frac{1}{5}$

So considering the two intensities we have to

$I_1 = \frac{P_1}{4\pi r_1^2}$

$I_2 = \frac{P_2}{4\pi r_2^2}$

The ratio between the two intensities would be

$\frac{I_1}{I_2} = \frac{ \frac{P_1}{4\pi r_1^2}}{\frac{P_2}{4\pi r_2^2}}$

The power does not change therefore it remains constant, which allows summarizing the expression to

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

Re-arrange to find $I_2$

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

$I_2 = 100*(\frac{1}{5})^2$

$I_2 = 4W/m^2$

Therefore the intensity at five times this distance from the source is $4W/m^2$

3 0

3 years ago

How long does it take (in minutes) for light to reach mercury from the sun, a distance of 6.02 × 107 km?

Ksju [112]

Light travels at a speed of:
$c=3 \cdot 10^8 m/s$
The distance between Mercury and Sun is $S=6.02 \cdot 10^7 km=6.02 \cdot 10^{10} m$ , so the time it takes is
$t= \frac{S}{c}= \frac{6.02 \cdot 10^{10} m}{3 \cdot 10^8 m/s} =200.7 s$
if we want to convert this into minutes, keeping in mind that 1 min = 60 seconds, we should divide this value by 60:
$t= \frac{200.7 s}{60 s/min}=3.34 min$

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4 years ago

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An opera singer breaks a crystal glass with her voice. Which best explains why this occurs? The pitch of her voice matches the p

aalyn [17]

The frequency at which the body vibrates breaks is natural frequency. The glass with her voice because the frequency of her voice matches the natural frequency of the glass.

<h3>What is the natural frequency?</h3>

When there is no external force acting on the body unless the body vibrates is known as the natural frequency of vibration.it is denoted by $\rm w_n$ .

when the frequency of a body matches the natural frequency a condition occurs known as resonance.

To learn more about the natural frequency refer to the link;

brainly.com/question/1123932

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2 years ago

Which is an example of a physical change?

Lilit [14]

Answer :
b - cake baking

explanation :
because the rest of the options are changing due to chemical reactions , when you bake a cake your developing it’s actions by touching it physically

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3 years ago

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Acid rain is an example of which type of chemical weathering?

tino4ka555 [31]

The answer is Carbonic acid

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3 years ago

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