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2 years ago

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Physics

1 answer:

wolverine [178]2 years ago

8 0

The layers that make up the upper mantle are the following.

The lithosphere and the asthenosphere.
The lithosphere and the asthenosphere are the layers that make up the upper mantle.
The rocky outer part of the Earth is called the lithosphere.
It is very rigid, solid, and it is not as hot as the other parts.
According to scientists, its thickness is about 90 to 100 kilometers from the surface of the earth.
The layer of the Earth that moves the lithospheric plates is called the asthenosphere.
Lithospheric plates are 60 miles long on average and are composed of continental crust.

We conclude that the lithosphere and the asthenosphere are the layers that make up the upper mantle. The new lithosphere is being created at oceanic ridges due to plate tectonics. Yes, planet Earth is getting larger constantly.

Learn more about this topic here:

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If the net force on a block is zero

amm1812

If the net force on a block is zero, the block will move at constant velocity

Explanation:

We can answer this question by applying Newton's second law of motion, which states that the net force on an object is equal to the product between its mass and its acceleration:

$\sum F = ma$ (1)

where

$\sum F$ is the net force on the object

m is its mass

a is its acceleration

In this problem, we have a block, and the net force on it is zero:

$\sum F = 0$

According to eq.(1), this also implies that

$a=0$

So, the acceleration of the block is zero.

However, acceleration is the rate of change of velocity of a body:

$a=\frac{\Delta v}{\Delta t}$

where $\Delta v$ is the change in velocity in a time of $\Delta t$ . Since the acceleration is zero, this means that $\Delta v=0$ , and therefore the velocity of the object is constant.

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