a group of students is investigating the relationship between the distance that mass is set from an axis and the rotational inertial that results. The students use the contraption shown, which consists of a solid cylinder of radius R and four connected arms. The arms have slots into which a mass can be connected. THe students choose to connect the four identical objects each a mass 1/4m each at a distance r from the center of the contraption. THen students then wrap several turns of string around the cylinder and connect the free end of the string to the ceiling. The students release the contraption so that it spins and unrolls, its center falling a distance D in time t. The students perform several experiments where the value of r varies but the value of m and D remain the same and measure the time