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3 years ago

The diagram below shows a portion of the rock cycle.

Physics

1 answer:

SCORPION-xisa [38]3 years ago

8 0

Referring to the attached image below which represents the complete rock cycle, we will find that a marble can be formed when hot magma is cooled and crystallized.

Applying this to the given diagram, we will find that marble is most likely formed in position C

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Organ system that is responsible for breaking down food

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Answer:

A. Digestive

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A 5kg bag falls a verticle height of 10m before hitting the ground.

g100num [7]

Answer:

$u = 7m {s}^{ - 1}$

Explanation:

We know that when we don't have air friction on a free fall the mechanical energy (I will symbololize it with ME) is equal everywhere. So we have:

$me(1) = me(2)$

where me(1) is mechanical energy while on h=10m

and me(2) is mechanical energy while on the ground

Ek(1) + DynamicE(1) = Ek(2) + DynamicE(2)

Ek(1) is equal to zero since an object that has reached its max height has a speed equal to zero.

DynamicE(2) is equal to zero since it's touching the ground

Using that info we have

$m \times g \times h = \frac{1}{2} \times m \times u {}^{2} \\$

we divide both sides of the equation with mass to make the math easier.

$9.8 \times 10 = \frac{1}{2} \times u {}^{2} \\ \frac{98}{2} = u {}^{2} \\ u { }^{2} = 49 \\ u = 7$

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4 years ago

A student measures the pH of a solution to be 6.8. Which should the student add if she wants to decrease the pH of the solution?

zloy xaker [14]

The neutral pH is 7. Less than 7 indicates an acid and more than 7 indicates a base (up to 14).
 NaCl - it's a salt (we can't measure the pH)
H2O - it can be an acid but also a base (the pH it is almost neutral,meaning close to 7 )
HF - it is a strong acid
 KOH - it is a strong base (pH=14)

↓

He needs to use HF (Hydrogen fluoride) to decrease the pH.

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3 years ago

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if an object is moving at a constant speed, the forces acting on it must be ___. Another way to say this is that the net force =

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If the object is moving at constant speed, it is under "equilibrium". So, forces acting on object are equal and the net force is zero.

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Plants that died a thousands of years ago.

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