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3 years ago

13

A state highway was constructed over wetlands. The state obtained a permit to fill the existing wetlands in accordance with the

provisions of the Clean Water Act in 1972, and agreed to create another wetland. This trade-off approach to addressing an environmental issue is known as__________.

1 answer:

bixtya [17]3 years ago

8 0

Answer:

Environmental mitigation

Explanation:

Environmental migitation is related environmental industry to describe impacts to the wetland, endangered species, archeological site, paleontological site or historic structure.

This Act mainly focus on action of reducing the severity, seriousness, or painfulness to the environment.

According Clean Water Act in 1972, they agreed to create a another wetland for state highway which was constructed over wetlands.

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For an object to appear red, what must happen?

Lapatulllka [165]

Answer:

<h2><em><u>C. It must reflect red light wavel</u></em></h2>

Explanation:

<em>The color of the object is reflected by the object other colors are absorbed by the object.</em>

Here <em>object appears in red color so red color is reflected by the object and other colors are absorbed.</em>

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3 years ago

A light-rail commuter train blows its 200 Hz horn as it approaches a crossing. The speed of sound is 339 m/s. (a) An observer wa

ddd [48]

Answer:

a) 30.82 m/s

b) 183.33 Hz

Explanation:

a)

V = speed of the sound = 339 m/s

v = speed of the train = ?

f' = observed frequency by the observer = 220 Hz

f = actual frequency of the observer = 200 Hz

using the equation

$f' = \frac{fV}{V - v}$

$220 = \frac{(200)(339)}{339 - v}$

v = 30.82 m/s

b)

V = speed of the sound = 339 m/s

v = speed of the train = 30.82 m/s

f'' = observed frequency by the observer as train moves away = ?

f = actual frequency of the observer = 200 Hz

using the equation

$f'' = \frac{fV}{V + v}$

$f'' = \frac{(200)(339)}{339 + 30.82}$

f'' = 183.33 Hz

3 0

3 years ago

If the maximum acceleration that is tolerable for passengers in a subway train is 1.21 m/s2 and subway stations are located 810

Rasek [7]

Answer:

v = 44.27 m / s

Explanation:

This is an exercise in kinematics since they ask the maximum speed of the train

v² = v₀² + 2 a x

a train departs with zero initial velocity

v² = 2 a x

v = √ 2ax

calculate

v = √ (2 1.21 810)

v = 44.27 m / s

in this solution we have assumed that the train uses the entire distance with acceleration

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4 years ago

A pencil rolls horizontally of a 1 meter high desk and lands .25 meters from the base of the desk. How fast was the pencil rolli

vovikov84 [41]

Answer: 0.55 m/s

Explanation:

This situation is related to projectile motion (also called parabolic motion), where the main equations are as follows:

$x=V_{o} cos\theta t$ (1)

$y=y_{o}+Vo sin \theta t + \frac{g}{2}t^{2}$ (2)

Where:

$x=0.25 m$ is the horizontal displacement of the pencil

$V_{o}$ is the pencil's initial velocity

$\theta=0\°$ since we are told the pencil rolls <u>horizontally</u> before falling

$t$ is the time since the pencil falls until it hits the ground

$y_{o}=1 m$ is the initial height of the pencil

$y=0$ is the final height of the pencil (when it finally hits the ground)

$g=-9.8m/s^{2}$ is the acceleration due gravity, always acting vertically downwards

Begining with (1):

$x=V_{o} cos(0\°) t$ (3)

$x=V_{o}t$ (4)

Finding $t$ from (2):

$0=1 m+ \frac{-9.8m/s^{2}}{2}t^{2}$ (5)

$t=\sqrt{\frac{-2y_{o}}{g}}$ (6)

Substituting (6) in (4):

$x=V_{o}\sqrt{\frac{-2y_{o}}{g}}$ (7)

Isolating $V_{o}$ :

$V_{o}=\frac{x}{\sqrt{\frac{-2y_{o}}{g}}}$ (8)

$V_{o}=\frac{0.25 m}{\sqrt{\frac{-2(1 m)}{-9.8m/s^{2}}}}$ (9)

Finally:

$V_{o}=0.55 m/s$

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nignag [31]

The position of the particle is given by:

x(t) = t³ - 12t² + 21t - 9

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x''(t) = 6t - 24

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3 years ago