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the lines to measure are not true length

how come 9 is d? copper has a higher reduction potential, and will act as an anode

2 is c because u use x=40/cos60/2 =80/2 =40 c?

i got 1 c 2 c 3 a 4 d 5 d 6 b 7 d 8 b 9 c 10 a

there was one question, involving stress that didnt give units for the area, i had to guess it was milimetres and the fact that the answer was in Kpa confirmed it, i tried meters first though and it failed