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Question 19M.2.SL.TZ1.1a.ii

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Date May 2019 Marks available [Maximum mark: 2] Reference code 19M.2.SL.TZ1.1a.ii
Level SL Paper 2 Time zone TZ1
Command term Deduce Question number a.ii Adapted from N/A
a.ii.
[Maximum mark: 2]
19M.2.SL.TZ1.1a.ii

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.

(a.ii)

Deduce that the average power output of the battery is about 240 W.

[2]

Markscheme

use of E = qV OR energy = 4.3 × 103 × 16 «= 6.88 × 105 J» ✔

power = 241 «W» ✔

Accept 229 W − 241 W depending on the exact value of t used from ai.

Must see at least three s.f.

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