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sweet [91]
3 years ago
15

Explain why the sound produced by every vibrating body cannot be heard by us ?​

Physics
1 answer:
VMariaS [17]3 years ago
5 0

Answer:

The human ear is not sensitive to every frequency of sound, rather, our hearing range is from 20Hz to 20,000Hz. This means sound frequencies outside this range are not audible to the human ear, which is why not every sound produced is heard. This is quite a blessing because if we could hear every vibrating body, then our ears would never stop listening: we won't be able to distinguish 'important sounds' from unimportant ones, rendering our ears effectively useless. Perhaps this is why we have a hearing range in the first place: sounds of our friends and our foes lie in 20Hz-20kHz range.

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The first few steps in deriving the quadratic formula are shown. Which best explains why is not added to the left side of the eq
bija089 [108]
The term b^2 / 4a^2 is not added to the left side of the equation, because the term that was added to the right was not either b^2 / 4 a^2.

As you can see the ther b^2 / 4a^2 that appears in the last step of the table is inside a parenthesis, which is preceded by factor a.


Then, you need to apply the distributive property to know the term that you are really adding to the right side,  i.e. you need to mulitply b^2 / 4a^2 * a which is b^2 / 4a.


That means that you are really adding b^2 / 4a to the right, so that is the same that you have to add to the left, which is what the last step of the table shows.


That situation is reflected by the statement "<span>The distributive property needs to be applied to determine the value to add to the left side of the equation to balance the sides of the equation".</span>  That is the answer.
6 0
3 years ago
Read 2 more answers
A runner hopes to complete the 10,000-m run in less than 30.0 min. after running at constant speed for exactly 26.0 min , there
kykrilka [37]
Let v =  the running speed
After running at constant speed for 26 min, the distance traveled is
d = (v m/min)*(26 min) = 26v m
Because there are 1500 m to go, the distance traveled is
10000 - 1500 = 8500 m

The running speed is
v = (8500 m)/(26 min) = 326.9 m/min
In km/h, the speed is
v = (0.3269 km/min)*(60 min/h) = 19.6 km/h

Answer: The running speed is 19.6 km/h 
8 0
2 years ago
Which material reflects the most light transparent, translucent, or opaque?
Svetradugi [14.3K]
There's no rule like that.  A glass mirror is opaque but reflects
more light than a clean transparent glass window does. 

On the other hand, a material that's transparent but shiny may
reflect more light than an opaque material that's painted black. 

You can't give any general rule.
6 0
2 years ago
An object with acceleration of -10 m/s2 is ___.
aksik [14]

A. speeding up 10 m/s every second.


an acceleration with a negative number simply implies direction.

positive being north (for example) and negative being south

4 0
3 years ago
A +0.0129 C charge feels a 4110 N
Savatey [412]

Answer:

r = 14.13 m

Explanation:

Given that,

Charge 1, q₁ = +0.0129 C

Charge 2, q₂ = -0.00707 C

The force between charges, F = 4110 N

We need to find the distance between charges. The formula for the force between charges is given by :

F=k\dfrac{q_1q_2}{r^2}

Where

r is the distance between charges

So,

r=\sqrt{\dfrac{kq_1q_2}{F}} \\\\r=\sqrt{\dfrac{9\times 10^9\times 0.0129 \times 0.00707 }{4110 }} \\\\r=14.13\ m

So, the distance between charges is equal to 14.13 m.

4 0
2 years ago
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