Their atomic numbers are all the same, because they all have the same number of protons. But their atomic weights are different, because they have different numbers of neutrons.

6 0

4 years ago

Find the direction of this vector.

Lyrx [107]

The direction of this vector is 170° from the positive x-axis.

Vectors are physical quantities with both magnitude and direction
To identify the direction, we usually use angles and take a reference axis
The vector in the diagram is 80° to the left of the positive y-axis, so the direction of the vector is 80° + 90° = 170° anti-clockwise from the positive x-axis.
Scalars are physical quantities which have only magnitude
Examples of vector quantities are displacement, velocity, acceleration, force etc
Examples of scalar quantities are distance, speed, volume, density, mass, time etc
The direction of the given vector is 170° from the positive x-axis.