Your boss asks you to design a room that can be as soundproof as possible and provides you with three samples of material. The only information on each sample's label is the material's coefficient of absorption. The coefficient of absorption listed on Sample A is 30%, on Sample B is 47%, and on Sample C is 62%. When your boss asks for your choice and the reasoning behind it, what would you tell him? A. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest.
B. Sample A would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the largest.
C. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest.
D. Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the largest.

Answers

Answer 1

Answer:

Answer: Option C: Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest.

Explanation:

The absorption coefficient of the samples is given. Sample A has 30%, Sample B has 47% and Sample C has 62%. This means that sample C absorbs the most percentage of energy incident on it. The energy in the reflected wave would be least. Hence, it would be best to use for a room to make it soundproof.

Answer 2

Answer:

The correct answer is Option C) Sample C would be best, because the percentage of the energy in an incident wave that remains in a reflected wave from this material is the smallest.

As the coefficient of absorption would define the energy present in the reflected wave, the material C has the highest percentage of absorption i.e. 62% and would be best suitable to make a sound proof room.

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When we first dig into soil, it's nice and soft.( Depending on what soil it is; usually topsoil)

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This is collection of quantitative data made by comparing a quantity with a standard unit. In science, the units are metric.

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Its called a measurement

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What is the force required to produce an acceleration of 46.4

Answers

That depends on the mass of the object, and the unit of the '46.4' .

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Which of the following factors caused the early atmosphere to become thicker

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Volcanic out-gassing, I had this question yesterday. :p

Which of the following factors caused the early atmosphere to become thicker? volcanic gassing

A spider is crawling on a wall. First it crawls 1 meter up, then 1 meter to the left, and then 1 meter down. what is its total displacement

Answers

1 meter up, 1 meter to the left and then 1 metter down.
It goes 1 meter up and 1 meter down, so its in the same place. The only displacement is 1 meter to the left.

Look at picture:

(hope this helps)

1 meter up and then 1 meter left, and then 1 meter down. The total displacement would be 1 meter. See Ayah's pic to help you understand more better:)

a gust of wind blows an apple from a tree. As the apple falls, the gravitational force on the apple is 2.25N downward and the force of the wind on the apple is 1.05N to the right. Find the magnitude and the direction of the net force on the apple.

Answers

Vertical component = 2.25 N downward

Horizontal component = 1.05 N to the right

Magnitude of the net force = √ (2.25² + 1.05²)
      = √6.165 = 2.483 N (rounded)

Direction of the net force = tan⁻¹ (1.05/2.25) to the right of downward

   = tan⁻¹ ( 7/15 ) to the right of downward

   = 25° to the right of downward (rounded)

The magnitude of the net force on the apple is $\boxed{2.48{\text{ N}}}$ .

The direction of the net force is with vertical $\boxed{25^\circ}$ .

Further explanation:

Here, we have to calculate the magnitude and the direction of the net force on the apple.

Given:

The gravitational force exerted on the apple is $2.25{\text{ N}}$ .

Force exerted by the wind on the apple is $1.05{\text{ N}}$ .

Formula and concept used:

The gravitational force is a universal force and it act in downward direction that is towards the center of the earth.

The direction of the force exerted by the wind on the apple is towards write side in the horizontal direction.

So, the angle between the gravitational force and force due to wind will be $90^\circ$ that is both the forces are perpendicular to each other.

Consider gravitational force is $W$ and force due to wind is $F$ .

So, the net force applied on the apple is,

$\boxed{R=\sqrt {\left( {{W^2} + {F^2} + 2WF\cos \theta } \right)} }$

Here, $\theta$ is the angle between both the forces which is equal to the $90^\circ$ .

So, the above equation can be written as,

$R=\sqrt {{W^2} + {F^2}}$ …… (1)

The direction of the net force can be written as,

$\boxed{\phi={{\tan }^( - 1)}\left( {(F)/(W)}\right)}$ ….. (2)

Calculation:

Substitute $2.25{\text{ N}}$ for $W$ and $1.05{\text{ N}}$ for $F$ in the equation (1).

$\begin{aligned}R&=\sqrt {{{2.25}^2}+{{1.05}^2}}\n&=\sqrt {6.165}\n&=2.48{\text{ N}}\n\end{gathered}$

For the direction,

Substitute $2.25{\text{ N}}$ for $W$ and $1.05{\text{ N}}$ for $F$ in the equation (2).

$\begin{aligned}\phi&={\tan ^( - 1)}\left( {\frac{{1.05}}{{2.25}}} \right)\n&=25^\circ\n\end{aligned}$

Thus, the net force on the apple is $\boxed{2.48{\text{ N}}}$ and direction of the net force is with vertical $\boxed{25^\circ}$ .

Learn more:

1. Water is a compound: brainly.com/question/1073452

2. Expansion of the gas with change in temperature: brainly.com/question/9979757

3. Two arrows are fired simultaneously with the speed of 30m/s brainly.com/question/2370982

Answer detail:

Grade: Senior School

Subject: Physics

Chapter: Force

Keywords:

Wind blow, apple falls, gravitational force, wind force, magnitude of force, direction of force, 2.25N downward, 1.05N, magnitude and direction, net force on apple.

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