DP Physics (first assessment 2025)

Question 20N.2.SL.TZ0.1a(iv)

Date	November 2020	Marks available	[Maximum mark: 2]	Reference code	20N.2.SL.TZ0.1a(iv)
Level	SL	Paper	2	Time zone	TZ0
Command term	Calculate	Question number	a(iv)	Adapted from	N/A

a(iv).

[Maximum mark: 2]

20N.2.SL.TZ0.1a(iv)

(a(iv))

Calculate the power transferred to the air by the aircraft.

[2]

Markscheme

ALTERNATIVE 1

power $« = rate of energy transfer to the air = \frac{1}{2} \frac{∆ m}{∆ t} v^{2} » = \frac{1}{2} \times 1.7 \times 8 . 1^{2}$ ✓

$= 56 « W »$ ✓

ALTERNATIVE 2

Power $« = Force \times v ave » = (0.95 + 0.45) \times 9.81 \times \frac{8.1}{2}$ ✓

$= 56 « W »$ ✓

Examiners report

HL only. It was common to see answers that neglected to average the velocity and consequently arrived at an answer twice the size of the correct one. This was awarded 1 of the 2 marks.

Syllabus sections

A. Space, time and motion » A.3 Work, energy and power

Question 20N.2.SL.TZ0.1a(iv)

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