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3 years ago

6

Select all that apply.

2 answers:

storchak [24]3 years ago

7 0

Answer:

litmus paper and phenolphthalein

Gre4nikov [31]3 years ago

4 0

Tasting or touching solutions to identify whether it is an acid or a base is something that you should always avoid since it can be dangerous and, in some cases, deadly.

<span>Phenolphthalein is typically used to test the pH level of a solution. Since you can determine whether a solution is an acid or a base by identifying the pH level, this is one of the correct answers.

</span>However, the question says to "select all that apply," so let's also check the last option, litmus paper.

Litmus paper is commonly used to identify whether something is an acid or a base. When blue litmus paper is exposed to an acid, it turns red. When red litmus paper is exposed to bases, it turns blue.

This means that the answers you should select are both litmus paper and <span>phenolphthalein.

Hope this helps!</span>

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This question is asking: Why does gravity occur? why will your notebook get pulled towards you?

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3 years ago

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A football kick returner catches the ball just as a player from the opposing team dives to tackle him. At the time of impact, th

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The total momentum of the players after collision is 130 kgm/s.

The given parameters:

<em>Initial momentum of the returner, </em> $P_i_1$ <em> = 0 kgm/s</em>
<em>The initial momentum of the diving player, </em> $P_i_2$ <em> = 130 kgm/s</em>

The total momentum of the players after collision is determined by applying the principle of conservation of linear momentum as follows;

$P_f = P_i_1 + P_i_2\\\\P_f = 0 + 130\\\\P_f = 130 \ kgm/s$

Thus, the total momentum of the players after collision is 130 kgm/s.

Learn more about conservation of linear momentum here: brainly.com/question/7538238

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2 years ago

What is the action force of a flying bird?

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3 years ago

A dockworker applies a constant horizontal force of 90.0 N to a block of ice on a smooth horizontal floor. The frictional force

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Answer:

The mass of the ice block is equal to 70.15 kg

Explanation:

The data for this exercise are as follows:

F=90 N

insignificant friction force

x=13 m

t=4.5 s

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applying the equation of rectilinear motion we have:

x = xo + vot + at^2/2

where xo = initial distance =0

vo=initial velocity = 0

a is the acceleration

therefore the equation is:

x = at^2/2

Clearing a:

a=2x/t^2=(2x13)/(4.5^2)=1.283 m/s^2

we use Newton's second law to calculate the mass of the ice block:

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4 years ago

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The noise level coming from a pig pen with

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Answer:

The decibel of the remaining pigs is 51.5 dB.

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Decibel (dB) is a unit of measure of the intensity of a given sound.

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Given that the intensity (I) of the sound from the pen is proportional to the number of pigs (N), thus:

I $\alpha$ N

I = kN

where k is the constant of proportionality.

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3 years ago