AQA 7407-2 PHYSICS-AS
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AQA 7407-2 PHYSICS-AS 1
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0 1 . 2 A metal wire of diameter d box is held in the gap between the anvil and the spindle. 
Just before the reading of d is taken, the gap is closed using the ratchet and not the 
thimble. 
Explain why the gap is closed in this way. 
[1 mark] 
0 1 . 3 The mass per unit length μ of the metal wire is given by 
 
2 
4 μ = 
πρd 
where ρ is the density of the metal. 
Values of d and μ are used to calculate ρ. 
The percentage uncertainty in d is 1.2%. 
The percentage uncertainty in μ is...
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AQA 7407-2 PHYSICS-AS•AQA 7407-2 PHYSICS-AS
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AQA 7407[1 & 2] PHYSICS PAPER 1 & 2 MAY 2023.• By revisionmaster111