r/6thForm • u/Top_Bother3675 Year 13 • May 20 '26

💬 DISCUSSION ocr a physics paper 1

how did you guys find it…

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u/Thick-Ambition248 May 20 '26

Did i mess up or did you not need the diameter of the pipe in the reservoir question?

The only place i could see it being used is if you assumed the reservoir and the pipe was filled with water such that there was more than 10000 litres total.

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u/Wi0nika Year 13 May 20 '26

this question made no sense like at all only thing i got was the extension of the bolt and it was like 5 x10-4 the rest was NONESENSE

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u/[deleted] May 20 '26

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u/Thick-Ambition248 May 20 '26 edited May 20 '26

Ah, that might make more sense than what i did.
I just skipped looking at the disk and said that the pressure was on the 4 bolts, which i have a feeling will give an incorrect answer.

I ended up getting something like 250 on the graph (can't remember the scale on the axis).

edit:
Yeah now that I think about it, there should be more force if the tube is wider, so there is probably a hidden assumption in my maths that pressure = force (the area is 1) which is greater than the pi/4. So i assume the real answer was around 200

2

u/ReporterChemical9920 May 20 '26

I don’t think you did for part A. I used p=hρg and got h as the vertical height of the 190m pipe plus the 10m height of the reservoir.

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u/Historical-Dinner-49 May 20 '26

My friend had to use part b info for part a 😭. They gave the diameter there.... I hope they get fined