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Sonja [21]
3 years ago
11

If a large housefly 2.4 m away from you makes a noise of 47.0 dB, what is the noise level (in dB) of 5400 flies at that distance

, assuming interference has a negligible effect?
Physics
1 answer:
dem82 [27]3 years ago
4 0

Answer:

the noise level of 5400 flies is equal to 84.32 dB

Explanation:

Noise made by house flies = 47 dB from the distance of 2.4 m

to calculate the noise of 5400 flies at a distance of 2.4 m.

the intensity of noise

  10 log_{10}(\dfrac{I}{I_0}) = 47 dB

now,  I' = 5400 I₀

=     10 log_{10}(\dfrac{5400 I}{I_0})

=    10 [log_{10}[5400] +log_{10}(\dfrac{I}{I_0}))      

= 10 ( 3.732 + 4.7 )                            

= 84.32 dB                                          

hence, the noise level of 5400 flies is equal to 84.32 dB

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lara31 [8.8K]

7.  First write down all the known variables while separating the values for each direction:

x-direction:

vix = 20m/s

vfx = 20m/s

x = 39.2m

y-direction:

viy = 0m/s

ay = -9.8m/s^2

y = ?

Based on the knowns, the first step is to calculate the time of flight from the x-direction as it will be the same as value for the y-direction.  Find the correct kinematic equation to do so:

x = (1/2)(vix+vfx)t

(39.2) = (1/2)(20+20)t

1.96s = t

Now that we have the time of flight, we can use the kinematic equation that will relate the known variables in the y-direction:

y = viy*t + (1/2)ay*t^2

y = (0)(1.96) + (1/2)(-9.8)(1.96)^2

y = -18.82m  (Value is negative because gravity constant was negative.  It is the height reference that from the top of the building down, which is why it is negative.  The sign can be ignored for this question.)


8.  First write down all the known variables while separating the values for each direction:

x-direction:

x = 12m

vfx = 0m/s

vix = ?

y-direction:

y1 = 1.2m

y2 = 0.6m

viy = 0m/s;

ay = -9.8m/s^2

First find time in the y-direction as it would be the same value for the x-direction.

(y2 - y1) = viy*t + (1/2)ay*t^2

(-0.6) = (0)t + (1/2)(-9.8)t^2

t = 0.35s

Now that we have the time of flight, we can use the kinematic equation that will relate the known variables in the x-direction:

x = (1/2)(vix+vfx)t

(12) = (1/2)(vix+(0))(0.35)

68.6m/s = vix

6 0
3 years ago
Based on the table, which isotope is best suited for use as a radioactive tracer for the body’s use of calcium? calcium-40 calci
Kaylis [27]

Answer:

calcium-47

Explanation:

Just did the test. Good Luck!

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3 years ago
A bowl of soup has_____? A:both PE and KE B:PE C:neither PE or KE D:KE
miskamm [114]

Answer:

A.

Explanation:

4 0
4 years ago
9. You drive a car from Milwaukee to Chicago, which is a distance of 150km and it takes you 95
Katena32 [7]

For this case we have to, by definition:

v = \frac {x} {t}

Where:

v: It's the velocity

x: It is the distance traveled

t: It is the time spent

1 hour equals 60 minutes and 1 minute equals 60 seconds.

On the other hand:

1 kilometer equals 1000 meters

So:\frac {150} {95} \frac{km} {min} * \frac {1} {60} \frac {min} {sec} * \frac {1000} {1} \frac {m} {km} = \frac {150 * 1000} {95 * 60} \frac {m} {sec} = \frac {15000} {5700} \frac {m} {sec} = 2.63 \frac {m} {sec}

On the other hand:\frac {150} {95} \frac{km} {min} * \frac {60} {1} \frac {min} {hr} = \frac {150 * 60} {95} \frac {km} {h} = 94.74 \frac {km} {h}

ANswer:

2.63 \frac {m} {sec}\\94.74 \frac {km} {h}

8 0
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What characteristic of an element determines how its atoms can bond with other<br>atoms?​
wlad13 [49]

Answer:

The number of electron in the outermost shell of a particular atom determine how the reactivity of  atoms to form chemical bonds with other atoms

Explanation:

This is because the number of atoms in the outer shell will determine if the atom has to gain or loose electrons for it to bond with other atoms

Hope this helps, and if it does mark as branliest answer thx

8 0
3 years ago
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