DP Physics (last assessment 2024)

Question 19N.2.SL.TZ0.a

Date	November 2019	Marks available	[Maximum mark: 3]	Reference code	19N.2.SL.TZ0.a
Level	SL	Paper	2	Time zone	TZ0
Command term	Determine	Question number	a	Adapted from	N/A

[Maximum mark: 3]

19N.2.SL.TZ0.a

Wind is incident on the blades of a wind turbine. The radius of the blades is 12 m. The following data are available for the air immediately before and after impact with the blades.

Determine the maximum power that can be extracted from the wind by this turbine.

[3]

Markscheme

$P = \frac{1}{2} \times A \times 1.2 \times 8^{3}$ OR $P = \frac{1}{2} \times A \times 1.32 \times 4^{3}$ ✔

$P$ «in incoming beam» = 1.4×105 «W»
OR
$P$ «in outgoing beam» = 1.9×104 «W» ✔

subtracts both P to obtain 1.2×105 «W» ✔

NOTE: Condone use of a wrong area or use of circumference in MP1.
Allow ECF from MP2.
Award [1] max for any attempt to use the formula for wind power which cubes the difference of velocities
Award [3] for a bald correct answer

Syllabus sections

Core

Core » Topic 8: Energy production » 8.1 – Energy sources

Core » Topic 8: Energy production

Question 19N.2.SL.TZ0.a

Select a Test

Syllabus sections

Confirm action