DP Physics (last assessment 2024)

Question 19N.3.HL.TZ0.c

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

[Maximum mark: 2]

19N.3.HL.TZ0.c

A pendulum bob is displaced until its centre is 30 mm above its rest position and then released. The motion of the pendulum is lightly damped.

The point of suspension now vibrates horizontally with small amplitude and frequency 0.80 Hz, which is the natural frequency of the pendulum. The amount of damping is unchanged.

When the pendulum oscillates with a constant amplitude the energy stored in the system is 20 mJ. Calculate the average power, in W, delivered to the pendulum by the driving force.

[2]

Markscheme

$94 = 2 π \times 0.80 \times \frac{0.020}{power loss}$ ✔

power added = $1.1 \times 10^{- 3}$ «W» ✔

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Option B: Engineering physics

Option B: Engineering physics » Option B: Engineering physics (Additional higher level option topics) » B.4 – Forced vibrations and resonance (HL only)

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

Question 19N.3.HL.TZ0.c

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