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3 years ago

Question 4

Physics

1 answer:

zmey [24]3 years ago

8 0

I think the answer is B but not too sure.

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Which option correctly shows the concentration of H3O+ ions in pure water?

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Answer:the correct answer is 1.0* 10^-7 mol/L

Explanation:

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3 years ago

Compare and contrast the shape and volume of each state of matter

Komok [63]

Answer:

<em><u>Solid</u> is the state in which matter maintains a fixed volume and shape; liquid is the state in which matter adapts to the shape of its container but varies only slightly in volume; and gas is the state in which matter expands to occupy the volume and shape of its container.</em>

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2 years ago

Archimedes tells us the lifting power of a balloon (how much mass it can lift) is equal to the difference between the mass of th

strojnjashka [21]

Answer:

Check the explanation

Explanation:

Kindly check the attached image below to see the step by step explanation to the question above.

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3 years ago

Two vectors of magnitudes 30 units and 70 units are added to each other. What are possible results of this addition? (section 3.

Ad libitum [116K]

Answer:

50 units

Explanation:

Given,

magnitude of the first vector = a = 30 units

magnitude of the second vector = 70 units

As we know, From the law of vector addition,

Resultant of the addition of the two vectors is,

$\therefor R\ =\ \sqrt{a^2\ +\ b^2\ +\ 2abcos\theta}$

where $\theta$ is the angle between the two vectors

And the value of $cos\theat$ lies between -1 ≤ $cos\theta$ ≥ 1.

For the possible values of the addition of the vectors

Therefore maximum possible value for the addition of the vector gives at the value of $cos\theta\ =\ 1$

$\therefore R_{max}\ =\ \sqrt{30^2\ +\ 70^2\ + 2\times 30\times 70\times 1}\\\Rightarrow R_{max}\ =\ 100 units$

Minimum possible value for the addition of the vectors gives at the value of $cos\theta\ =\ -1$

$\therefore R_{min}\ =\ \sqrt{30^2\ +\ 70^2\ + 2\times 30\times 70\times (-1)}\\\Rightarrow R_{min}\ =\ 40 units$

Hence the possible results of the addition of these two vectors is only 50 units which lies between the 40 units and 100 units.

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4 years ago

An opaque box encloses a region of space. We can't tell what is inside the box but we can see that on all faces of the box there

Simora [160]

Answer:

The charge must be negative

Explanation:

Hi!

The direction of the electric field of a charge depends on the sign of the charge, when it is positive, the electric field points outwards the charge but when it is negative, it points towards the charge. (As you can seen on teh attached image)

So, if on the faces of the box, the non-zero elecric field points inwards, it must mean that the total charge inside the box must be negative

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3 years ago