The properties of a substance can be observed only when it undergoes a change to become an entirely different
kind of substance with different properties,

What are the factors that affect the resistance of a wire?

The frequencies refer to the sample data collected from a population of interest when performing a hypothesis test comparing two or more population proportions.

On mars a rock falls an unknown vertical distance from a resting position and lands in a crater. if it takes the rock 2.5 seconds to fall, how high is the cliff the rock fell from? mars' surface gravity is 3.8 m/s2.