First of all, not to get confused with terminology, unit vectors are called unit vectors because they have a unit length. This has absolutely nothing to do with physical units.
Now, if you are talking about physical units like m, m/s or N. Then it depends on what physical vector quantity you’re talking about. If it’s the displacement vector then the i,j,k will have units of length i.e. meters (m). If it’s the force vector then the i,j,k will have units of force i.e. newtons (N).
But if you are talking about vectors in math, then they are unitless. So, we just pretend the physical unit is 1.
Again stressing that this has nothing to do with their name “unit vectors”. They are called that because the unit, AKA the number “1”, is the value of their magnitude/length.
They have magnitude 1, bearing the unit of physical quantity they represent.
Answer:
Un automóvil deportivo de 921 kg se mueve hacia la derecha con una rapidez de 29.0 m / s.
Explanation:
The change in momentum is (magnitude) 2 kg m/s
Explanation:
The change in momentum of an object is given by
where
m is the mass of the object
v is the final velocity
u is the initial velocity
Since momentum is a vector, it is important to correctly take into account the sign (therefore, the direction) of the velocities.
For the ball in this problem, we have:
m = 0.2 kg is the mass
u = 6 m/s (taking east as positive direction)
v = -4 m/s (west is negative direction)
So the change in momentum is
And since we are only interested in the magnitude, the answer is
Learn more about change in momentum:
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Answer:
2.304 × 10^-28 N
Explanation:
Compute the force on each of two electrons when they are seperated in vaccum by a distance corresponding to the approximate size of an ato. (0.100nm)
Solution
The formula to use is
F = K Qq / r^2
Substitute all the parameters
F = 9 × 10^9 × (1.6 × 10^-19)^2 / (0.1 × 10^-9)^2
F = 2.304 × 10^-28 / 1 × 10^-10
F = 2.304 × 10^-18 N
Therefore, the force between each of the electron is 2.304 × 10^-18 N
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They help decrease pollution-related illnesses.
It does not need large amounts of water for its operation.