3. Student 3 and Student 4 measure the time it takes for two smooth aluminum spheres to roll down

a ramp, and they make a histogram analogous to that made by Student 1 and Student 2. The radii

of the two spheres are the same (at least, to the precision of their measurement device), but one

sphere is hollow while the other is solid.

a. Is this a reasonable test of the effect of mass on the acceleration of a sphere? If not, what would

be?

b. Is this a reasonable test of the effect of hollowness? If not, what would be?