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Umnica [9.8K]
3 years ago
8

At 25 mph, it will take you about how many feet to stop your car?

Physics
1 answer:
sp2606 [1]3 years ago
7 0
It will take approximately 8 - 10 feet.
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Which of the following is an example of a renewable natural resource?
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Answer:

c. lumber      

Explanation:

Lumber is considered a renewable natural resource because it is gotten from trees and trees are grow-able. A renewable natural resource is a resource which can be used repeatedly and replaced naturally. Examples of renewable natural resources are solar energy from the sun, water, oxygen, biomass, trees etc. Trees can be harvested and processed into lumber. The harvested trees can be planted again by humans or they can naturally reproduce through seedlings or fruits that drop and germinate on their own. This renewable germinating process of trees makes lumber a renewable natural resource.

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In the qualifying round of the 50-yd freestyle in the sectional swimming championship, Dugan got an early lead by finishing the
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Answer:

v = 0

Explanation:

Given that,

Total distance is 50 yards

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How far must you be from a 110 W speaker to have an intensity of 0.0439 W/m^2? (Treat the speaker as a point source.)
Lina20 [59]

Answer:

d=14.12m

Explanation:

Assume a point sound source that emits a sound power<em> P </em>(in W) evenly in all directions of space. Let us also assume that the medium does not absorb this sound power when it passes through it. At a distance<em> d </em>from the source this power will have been evenly distributed over the surface of a sphere of radius <em>d</em>. Therefore, the acoustic intensity I at distance d will be worth:

I=\frac{P}{4\pi d^{2}}

This is the expression of the so-called<em> law of the square of distance: "the intensity is inversely proportional to the square of the distance to the source (considered punctual)".</em>

So

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P=110W

d=\sqrt { \frac{P}{4 \pi\\I}

d=\sqrt{ \frac{110}{ 4\pi (0,0439)} }

d=\sqrt{{199.39}

d=14.12m

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Both would go 15N. Hoped I helped!

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Bats use ultrasound in echolocation. This sound is characterized by _____.
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