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.

17. Based on the data in Table 3, which of the following bar graphs best represents the periods of the torsion pendulums having a rod mass of 30 g, a rod length of 10 cm, and a mass per disk of 1 g, 2 g, or 3 g?

Answer and Explanation

Your Answer is

Correct Answer is B

Explanation

Look at the values ​​corresponding to the group of 10 cm in the middle of Table 3. When the mass per disk is 1, 2, and 3, the Period corresponds to 6.3, 6.8, and 7.3 respectively. The period increases at a time, so option B is reasonable.