What happens when a substance undergoes a physical change?

A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

When a substance undergoes a physical change, there is a change of state coupled with the release or absorbtion of energy.

Explanation:

A physical change is a reversible transformation of an object from one form to another that can be observed. In this case, it occurs majorly when an object releases or absorbs a definite amount of energy (e.g heat). It does not affect the chemical composition of the object.

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

it would be c. predictability