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[Music] hello everyone welcome back to zed physics what were going to be doing today is solving the 2019 unified physics paper from ocr just before we get started with the questions just a little disclaimer that this video is not affiliated with the exam board and this are these are not official solutions so if youre after the official paper with the official solutions and the examiners reports and uh some very very useful information please head to the ocr website and you can see the link in the description for that okay well lets have a look at question one which is all about a rocket really interesting okay so we have a toy rocket which is made from 1.5 liter from a 1.5 litre plastic bottle and we have some fins for stability really really cool now initially would contain it contains 0.3 liters of water and that leaves 1.2 liters of trapped air at a temperature of 70 degrees a pump is used to increase the pressure within the plastic bottle to 2.4 times central power 5 pascals at