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Physics needs numbers, but until we connect our numbers with the physical world, they are just arithmetic. ‘Deduce’ tasks help us see this clearly. Calculations will be at the heart of the solution, but we must start with data and end by comparing our results with the real situation.
The question discussed in this ‘Exam talkback’ is about what happens when the air temperature inside a balloon increases. The task is simply: ‘Deduce whether the balloon can take off’.
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