During mr. nye's science class, students were expected to identify various substances using physical properties they could easily measure. mr. nye gave each of the five groups a green, metal cube and asked them to identify what the cube was made of. matt's cube, after 5 trials, had an average density of 7.40 g/cm3 . his group's cube was made of a) aluminum. b) gold. c) nickel. d) zinc.

The famous scientist galileo galilei did several experiments with sloping planes, which he rolled metal balls down so that he could study motion. by changing the slope, he could study how the speed at which the ball rolled was affected. what was the independent variable in galileo's experiment? a. the speed of the ball b. the slope of the plane c. whether the ball moved d. what the ball was made of