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lol na na i knw that but i dnt know how to solve 1.they find the change in temp then multiply the original length*change in length for the decrease in temperaturehaha memorizing is my weak point ... and part 2 would be solved via Stress/Strain..
http://papers.xtremepapers.com/CIE/Cambridge International A and AS Level/Physics (9702)/9702_s05_qp_2.pdf
Q6 b) all parts.