Question 19M.2.HL.TZ1.a.i
| Date | May 2019 | Marks available | [Maximum mark: 3] | Reference code | 19M.2.HL.TZ1.a.i |
| Level | HL | Paper | 2 | Time zone | TZ1 |
| Command term | Calculate | Question number | a.i | Adapted from | N/A |
A small metal pendulum bob is suspended at rest from a fixed point with a length of thread of negligible mass. Air resistance is negligible.
The pendulum begins to oscillate. Assume that the motion of the system is simple harmonic, and in one vertical plane.
The graph shows the variation of kinetic energy of the pendulum bob with time.
Calculate, in m, the length of the thread. State your answer to an appropriate number of significant figures.
[3]
identifies T as 2.25 s ✔
L = 1.26 m ✔
1.3 / 1.26 «m» ✔
Accept any number of s.f. for MP2.
Accept any answer with 2 or 3 s.f. for MP3.
This question was well approached by candidates. The noteworthy mistakes were not reading the correct period of the pendulum from the graph, and some simple calculation and mathematical errors. This question also had one mark for writing an answer with the correct number of significant digits. Candidates should be aware to look for significant digit question on the exam and can write any number with correct number of significant digits for the mark.
