DP Physics (last assessment 2024)
Question 19M.3.HL.TZ2.14a
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.3.HL.TZ2.14a |
| Level | HL | Paper | 3 | Time zone | TZ2 |
| Command term | Show that | Question number | a | Adapted from | N/A |
a.
[Maximum mark: 1]
19M.3.HL.TZ2.14a
A railway track passes over a bridge that has a span of 20 m.
The bridge is subject to a periodic force as a train crosses, this is caused by the weight of the train acting through the wheels as they pass the centre of the bridge.
The wheels of the train are separated by 25 m.
(a)
Show that, when the speed of the train is 10 m s-1, the frequency of the periodic force is 0.4 Hz.
[1]
Markscheme
time period
T = «» = 2.5 s AND f =
OR
evidence of f = ✔
Answer 0.4 Hz is given, check correct working is shown.
Examiners report
The question was correctly answered by almost all candidates.
