Answer: object B is negatively charged, object C is positively charged and object D is also positively charged
Explanation: since unlike charges attract and like charges repel, for object A which is positively charged and B to attract B must be negatively charged and then for B which is negatively charged and C to attract C must be positively charged and for C and D to repel they have to be of thesame charge which means D is positive as well.
The electron relaxation time is
The mean free path is
<u>Explanation:</u>
Electron density,
Aluminium resistivity,
From the Drude's model we have:
Where:
τ= Electron relaxation time
m = mass of a charge
q = magnitude of a charge
We know, electron mass =
Charge of electron =
By substituting all given values for electron, we get
When multiply by 100 and divide by 100, we get
Mean free path is given as:
where:
l = Mean free path
= Average velocity of electrons
We know the general value for average velocity of electrons at room temperature:
Therefore,
The displacement is a vector that is calculated by subtracting the final and initial positions of an object that has made a movement.
We know that initially the object was at the origin and moved to the -8m position.
Suppose that the movement was made on the x-axis. So:
d = [-8 - (0)]x
d = -8x
Regarding the second question.
When the acceleration is constant then the speed changes at a constant rate. Therefore the graph of velocity vs. time will look like a line with a negative slope (if the acceleration is negative) or a line with a positive slope (if the acceleration is positive)
For example. Suppose that the acceleration of gravity is 10
Now suppose you drop an object from a building.
At the initial moment (second 0) the speed is 0 m/s.
After 1 second the speed of the object will be 10 m/s.
After 2 seconds the speed of the object will be 20 m/s.
After 4 seconds the speed will be 40 m/s.
The graph of this example is shown in the attached figure. Note that it is a straight line.
Answer:
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