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# A-level Physics exam question help (AQA) watch

1. If someone could make a mark scheme for this question that would be great as I want to mark my answers but I can't find the ms anywhere.

The diagram below shows a crane moving a heavy load of mass 1.5x10^3 kg.
The mass of the cable is negligible compared with the mass of the load.
When the jib moves round and then stops the load swings and behaves like a simple pendulum, undergoing free oscillations. The oscillation has an amplitude of 5.0m and a period of 8.0s.

a)i) Explain briefly the difference between a free and a forced vibration (2)
ii)Calculate the length of the cable (2)
iii) Determine the maximum acceleration of the load as it swings (2)
iv) Calculate the force on the load that produces this acceleration (2)
2. anyone? no?

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Updated: October 31, 2016
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