You would like to know whether silicon will float in mercury and you know that can determine this based on their densities. Unfo
rtunately, you have the density of mercury in units of kilogram-meter^3 and the density of silicon in other units: 2.33 gram-centimeter^3. You decide to convert the density of silicon into units of kilogram-meter^3 to perform the comparison. By which combination of conversion factors will you multiply 2.33 gram-centimeter^3 to perform the unit conversion?
As given, the student has three balloons and rubs two of them on a piece of wool. The rubbing of balloon on wool is the independent variable as it was done on two and not on the third as control.