Question 19M.2.SL.TZ1.a.i
| Date | May 2019 | Marks available | [Maximum mark: 1] | Reference code | 19M.2.SL.TZ1.a.i |
| Level | SL | Paper | 2 | Time zone | TZ1 |
| Command term | Show | Question number | a.i | Adapted from | N/A |
A girl rides a bicycle that is powered by an electric motor. A battery transfers energy to the electric motor. The emf of the battery is 16 V and it can deliver a charge of 43 kC when discharging completely from a full charge.
The maximum speed of the girl on a horizontal road is 7.0 m s–1 with energy from the battery alone. The maximum distance that the girl can travel under these conditions is 20 km.
Show that the time taken for the battery to discharge is about 3 × 103 s.
[1]
time taken «= 2860 s» = 2900«s» ✔
Must see at least two s.f.
This question was generally well answered. Candidates should be reminded on questions where a given value is being calculated that they should include an unrounded answer. This whole question set was a blend of electricity and mechanics concepts, and it was clear that some candidates struggled with applying the correct concepts in the various sub-questions.
