What is an example of a conceptual model in science?

A mental image of gas molecule as tiny balls

Explanation:

APEX

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.

see the picture for the vector

the magnitude of the vector by pythagorean theorem

r = √( (-10)^2 + (3)^2 ) = √109

magnitude = √109 units

the direction angle between vector and x-axis is

tan^(-1)(3/10) = 16.699

so the direction is approximately 16.7 degrees north of west