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4 years ago

Which pair of sentences is describing the same velocity?

2 answers:

7 0

Answer: D) Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.

Explanation:

Since velocity is a vector quantity so it will have magnitude as well as direction . Two objects are said to have same velocity if both are travelling with same speed in same direction.C

Consider case (A) - in this case speed of cars are different because one car is at rest while other is moving with certain speed. Thus velocity is different .

Consider case (B) - Bus and truck are travelling with different speed so velocity of truck is different from velocity of bus .

Consider case (C)- In this case both boy and girl are travelling with same speed but in different direction thus velocity of boy is different from the velocity of girl .

Consider case (D)- In this case Valerie and Owen are travelling in same direction (towards south) with same speed of 8 kilometers per hour. Therefore they are travelling with same velocity .

Thus the pair of sentences describing the same velocity is

D) Valerie rides her bike south at 8 kilometers per hour. Owen jogs south at 8 kilometers per hour.

Monica [59]4 years ago

6 0

The answer would be B because velocity is the speed of something in a given direction.

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A ray of light crosses a boundary between two transparent materials. The medium the ray enters has a larger optical density. Whi

Tpy6a [65]

Answer:

The wavelength of the light decreases as it enters into the medium with the greater optical density.

The frequency of the light remains constant as it transitions between materials.

Explanation:

- When a ray of light crosses a boundary between two different materials, it undergoes refraction: the ray changes direction, and it also changes speed, according to the relationship:

$v=\frac{c}{n}$

where v is the speed of the ray of light in the material, c is the speed of light in a vacuum, n is the index of refraction of the material, which is larger for a medium with larger optical density. So, from the equation, we see that the larger the optical density, the smaller the speed of the wave.

- The frequency of the light does not depend on the properties of the medium, so it remains unchanged: therefore the statement

The frequency of the light remains constant as it transitions between materials.

is correct.

- Moreover, the wavelength of the ray of light is related to the speed and the frequency by the equation

$\lambda=\frac{v}{f}$

where v is the speed and f the frequency. Since we have seen that v decreases and f remains constant, this means that the wavelength decreases as well, so the statement

The wavelength of the light decreases as it enters into the medium with the greater optical density.

is also correct.

5 0

3 years ago

Uma chapa metálica, com um furo central de diâmetro "d", é aquecida dentro de um forno. Com o aumento da temperatura, podemos af

Tatiana [17]

Answer: O furo diminui enquanto a chapa aumenta a sua dimensão.

(The diameter decreases and the dimensions of the metal increases)

Explanation:

I will answer in English:

Here we have a piece of metal with a small hole on it, that is heated in a hoven.

We know that when a piece of metal is heated, it will expand (the density decreases, so the dimensions of the piece of metal increase).

Now, particularly, the hole will also expand but inwards, as each "extreme" of the piece of metal, will expand into where it has less resistance, so it will expand in the region where there is no material. This "inwards" expansion is why the diameter of the hole will decrease.

4 0

3 years ago

Tech A says a camshaft position sensor must be positioned correctly to accurately signal the position of the camshaft to the pow

qaws [65]

Answer:

Both Tech A and Tech B

Explanation:

It's important to position sensor accurately to the position of camshaft to the powertrain control in the ignition module as said by Tech A. Equally, to achieve what Tech A says, a special tool can be used for comparing the position of camshaft sensor to crankshaft sensor. Therefore, both technicians are correct.

6 0

3 years ago

How can Punnett square predict results of crossbreedind in peas

nika2105 [10]

Hey there,

Question: How can Punnett square predict results of crossbreedind in peas?

Answer : Because it shows all alleles and possible phenotypes.

Hope this helps :D

~Top♥

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3 years ago

A 1.0 kg cart moving right at 5.0 m/s on a frictionless track collides with a second cart moving at 2.0m/s. The 1.0 kg cart has

____ [38]

Answer:

m₂ = 3kg

Explanation:

The question wasn't clear about what direction the initial velocity of the second cart was, so I'll assume it was going left at 2.0m/s.

Anyway, this is a conservation of momentum problem. The equation you need to use is the one written in blue. They want you to solve for the mass of the second cart, so do some algebra and rearrange that blue equation in term of m₂.

Now that you have the equation for m₂, plug in all the values given from the question and you'll get 3kg.

3 0

4 years ago