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Furkat [3]
3 years ago
5

What percent of air by volume is nitrogen​

Physics
1 answer:
nlexa [21]3 years ago
5 0

Answer:

78 percent

Explanation:

I guess that's the right answer

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A wooden block contains some nails so that its density is exactly equal to that of water. If it is placed in a tank of water and
belka [17]

Answer:

The correct answer is:

a) remain where it is released

Explanation:

The concept of density seeks to measure the weight of an object in relation to its size. It is the measure of how packed together the particles of that object are. An object placed in a liquid displaces a certain volume of the liquid, based on the relative density of the object and the liquid.

If an object is less dense than a liquid in which it is placed, it displaces a smaller volume of the liquid than its volume, hence only some part of the object will be seen to be under the liquid, the other part will float.

If an object is denser than the liquid in which it is placed, it displaces a larger volume of the liquid than its own volume, making the object to sink and is submerged, sometimes to the bottom of the liquid, but mostly below the point at which it was released.

Finally, if the density of an object and the liquid into which it is submerged is the same. the object's mass per unit volume is the same as the liquid's mass per unit volume, hence the weight and force created due to density will balance and cancel each other out hence making the object to remain where it was submerged.

8 0
3 years ago
Why are all galaxies moving away from us?
ipn [44]
Galaxy million of star and planet. gravitional wave field all the universe some planet explosive itself moving other places . Black holes Mass gravity field
7 0
3 years ago
An object begins with a speed of 20 meters per second and slows down to a speed of 10 meters per second over a time of 5 seconds
Andreyy89

Answer:

V = 6 m/s

Explanation:

Given that,

Initial speed of an object is 20 m/s

Final speed of an object is 10 m/s

Time, t = 5 s

We need to find the average speed of the object during these 5 seconds. Let it is equal to V. Here, time is same. The average speed is given by :

V=\dfrac{x+y}{2}\\\\\text{Putting values}\\\\V=\dfrac{20+10}{5}\\\\V=6\ m/s

So, the average speed of the object is 6 m/s.

3 0
3 years ago
How do you think overpumping groudwater is related to the formation of sinkholes?
vladimir2022 [97]
Ground water keept the ground at a stable level when it is gone the cavern it was in has no support and is at risk of callaps
3 0
3 years ago
How is energy transferred through a generator that produces electric current? A.from armature to commutator to brushes to turbin
vaieri [72.5K]
Armature to commutator to brushes to turbine
7 0
3 years ago
Read 2 more answers
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