DP Physics (last assessment 2024)

Question 20N.3.HL.TZ0.c(iii)

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

c(iii).

[Maximum mark: 2]

20N.3.HL.TZ0.c(iii)

A sphere is dropped into a container of oil.
The following data are available.

Density of oil $= 915 kg m^{- 3}$
Viscosity of oil $= 37.9 \times 10^{- 3} Pas$
Volume of sphere $= 7.24 \times 10^{- 6} m^{3}$
Mass of sphere $= 12.6 g$

The sphere is now suspended from a spring so that the sphere is below the surface of the oil.

Outline the effect on $Q$ of changing the oil to one with greater viscosity.

[2]

Markscheme

drag force increases OR damping increases OR more energy lost per cycle ✓

$Q$ will decrease ✓

Examiners report

Very well answered.

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Option B: Engineering physics

Option B: Engineering physics » Option B: Engineering physics (Additional higher level option topics) » B.3 – Fluids and fluid dynamics (HL only)

Option B: Engineering physics » Option B: Engineering physics (Additional higher level option topics)

Question 20N.3.HL.TZ0.c(iii)

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