The definition of the center of mass allows to find the result for the position of the mass center of more than the H₂O molecule is;
the concept of center of mass of a system is the point where external forces are applied, it is given by the expression
Where M is the total mass of the systemr_i and m_i sums the position and masses of the element i of the system
In the attachment we have a diagram of the system where the axis and coordinates of the molecules are shown, in this case it is indicated that the origin is in the oxygen atom, so its distance is zero.
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They indicate the mass of the hydrogen atom m = 1.008 amu, the bond length r = 0.103 nm and there is an angle 106º between the two hydrogens, therefore the angle from the vertical is:
θ = 106/2 = 53º
Let's find the position of the center of mass for each axis.
x-axis
y-axis
Let's use trigonometry to find the components of the bond length.
cos θ =
sin θ =
y = L cos θ
x = L sin θ
We substitute.
we use.
sin θ = - sin -θ
cos θ = cos -θ
Let's calculate.
We see that the center of mass is on the x axis and at a distance from the y-axis of 6.9 10-3 nm
In conclusion using the definition of the center of mass we can find the result for the position of the center of mass of the H₂O molecule is;
and cm = 6.9 10⁻³ nm
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The reason a car traveling in the opposite direction of the way you're traveling is simple. if you are going one way, and cars are passing you on the other, it appears that they are going much faster than they are. the combination of your relative speeds means that those cars might appear to be doing 60mph, rather than 30mph.
Answer:
Astronaut in spacecraft while orbiting earth experience weightlessness because there is no gravity of earth or moon is acting on the body of an astronaut.
while on earth, we experience weight because the gravity of earth is acting on our body which is pulling us downward.
Both spacecraft and the astronauts both are in a free-fall condition.
Answer:
Force of static friction between the two surfaces
Explanation:
When two surfaces come into contact, they exert a force that resist the sliding of the two surfaces. This force is called static friction.
This force is given by the relation
Where,
μ - coefficient of static friction
η - normal force acting on the body
When a force acts on a body placed on a rough surface, it doesn't do any work if the applied force was less than the force of static friction.
So, in order to move the body, the applied force should be greater than the force of static friction.