DP Physics (first assessment 2025)
Question EXE.2.HL.TZ0.d
Date | Example questions Example questions | Marks available | [Maximum mark: 3] | Reference code | EXE.2.HL.TZ0.d |
Level | HL | Paper | 2 | Time zone | TZ0 |
Command term | Show that | Question number | d | Adapted from | N/A |
d.
[Maximum mark: 3]
EXE.2.HL.TZ0.d
During a maintenance shutdown of the reactor, the gas supply to the turbine is cut off and the turbine gradually comes to rest. The diagram shows how the angular speed of the turbine varies with time t.
Show that the rotational kinetic energy of the turbine decreases at a constant rate.
[3]
Markscheme
Rotational KE is proportional to ✓
Calculation of for at least four points, e.g. {96.1, 76.7, 57.6, 38.4, 19.3}×103
Shows that the differences in equal time intervals are approximately the same, e.g. {19.4, 19.1, 19.2, 19.1, 19.3}×103 ✓
Allow a tolerance of ±1×103 s−2 from the values stated in MP2.
