How much Nitrogen (N) atoms are in this 3NH4Cl?
1 answer:
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<h2>The work done , when body moves along the plane </h2>
Explanation:
A body is projected from bottom of the inclined plane . When body is going up the plane .
The downward force = m g sinθ is developed due to its weight
As body is moving upwards , the force of friction will act downwards
The force of friction = μ R
here μ is the coefficient of friction ans R is the normal reaction
Thus force of friction f = μ mg cosθ
Let the acceleration upwards is a
The upward force required = m a
Thus m a = mg sinθ + μ mg cosθ
or acceleration a = g ( sinθ + μ cosθ )
The work done in moving upwards W = F S
Thus W = mg ( sinθ + μ cosθ ) S
here S is the displacement on the plane
When body moves down , the force of friction acts upwards
Thus m a = m g ( sinθ - μ cosθ )
The work done W = m g ( sinθ - μ cosθ ) S
As the body is projected with velocity u
which can be calculated by the relation v² - u² = - 2 a X
Here v = 0 at the highest point
Thus u =
here a = g ( sinθ + μ cosθ )
Similarly , when it moves down , the initial velocity u = 0
Thus v² - 0 = 2 a x
or v =
here a = g ( sinθ - μ cosθ )
Answer:
It would not be possible the cohesion among water molecules by the polar covalent bonding.
Well, to understand this in a better way, let's begin by explaining that water is special due to its properties, which makes this fluid useful for many purposes and for the existence of life.
In this sense, one of the main properties of water is cohesion (molecular cohesion), which is the attraction of molecules to others of the same type. So, water molecule () has 2 hydrogen atoms attached to 1 oxygen atom and can stick to itself through hydrogen bonds.
How is this possible?
By the polar covalent bonding, a process in which electrons are shared unequally between atoms, due to the unequal distribution of electrons between atoms of different elements. In other words: slightly positive and slightly negative charges appear in different parts of the molecule.
Now, it can be said that a water molecule has a negative side (oxygen) and a positive side (hydrogen). This is how the oxygen atom tends to monopolize more electrons and keeps them away from hydrogen. Thanks to this polarity, water molecules can stick together.