Question 2: The rotational speed of the smaller wheel is two times greater than that of the larger wheel because it is revolving around its axis more than the larger wheel is. The tangential speed of the larger wheel is twice as large as that of the smaller because, in this example, tangential speed is measured by the length from the axis to the rim.
Question 4: Sue’s bike wheels have a greater rotational speed than Dan’s because her wheels are smaller, even though they are traveling at the same speed. Because her wheels are smaller, they will make a rotation more often than Dan’s wheels will. Therefore, her rotational speed is greater.