Passage IV
One type of torsion pendulum consists of a wire tied to a rod with a disk on each end. The pendulum is suspended from a support (see Figure 1).
The rod is turned, twisting the wire, and then released, causing the rod and disks to oscillate (twist back and forth) in a horizontal arc, as shown in the top views in Figure 2.
The period is the time required for the rod to complete 1 round trip. Tables 1-3 give the periods of torsion pendulums made with identical wires and various disk masses, rod masses, and rod lengths.
18. Based on the data in Table 2,if each end of the 10 cm rod had a 4 g disk attached, the period of the torsion pendulum would be:
Your Answer is
Correct Answer is J
Explanation
It can be seen from Table 2 that as the quality of the disk increases, the period will also increase. So when the rod length is 10 cm, the period should be greater than 6.5.