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Ill reply for each one seperately cause my laptop is being uber-slow right now.
For s03 --q2 a) when water is evaporating at a constant temperature, there is no change in k.e but the molecules must overcome the intermolecular forces.. they move away from each other and so their potential energy increases. Internal energy is p.e + k.e, so internal energy is increasing if p.e is increasing.
Stretching a wire is the same story. When you stretch the wire, you make the atoms and electrons rearrange and move away from each other so the p.e increases.
Thank you so much ... Can you please answer my final question?
http://www.xtremepapers.com/CIE/International A And AS Level/9702 - Physics/9702_s11_qp_41.pdf
- Number 6 (b)(ii)