DP Physics (first assessment 2025)

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Question 20N.2.SL.TZ0.12b

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Date November 2020 Marks available [Maximum mark: 3] Reference code 20N.2.SL.TZ0.12b
Level SL Paper 2 Time zone TZ0
Command term Determine Question number b Adapted from N/A
b.
[Maximum mark: 3]
20N.2.SL.TZ0.12b
(b)

Determine the terminal velocity of the sphere.

[3]

Markscheme

radius of sphere=0.012«m» ✓

 

weight of sphere=6πηrv+ρVg

OR

v=1.26×10-2-915×7.24×10-6×9.816π×37.9×10-3×1.2×10-2 ✓

 

v=6.84«ms1»  ✓

 

Accept use of g=10 leading to v=7.0«ms1»

Allow implicit calculation of radius for MP1

Do not allow ECF for MP3 if buoyant force omitted.

Examiners report

Only those candidates who forgot to include the buoyant force missed marks here.