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Physics paper 1 doubt

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Got Tech? GO TECH:
I'm doing summer 2000, and I came across question 13. Can you please explain the solution? Thanks!

holtadit:
Please take a screen shot of the question.

I dont have the paper :)

Got Tech? GO TECH:
Here's the link:
http://www.freeexampapers.us/IGCSE/Physics/CIE/2000%20Jun/0625_s00_qp_01.pdf

page 6, q13..Thx!

holtadit:
hang on

holtadit:
It would be D.

The dam wall needs to be thicker at the bottom. WHY U ask ?

Because pressure INCREASES with depth thus the pressure UNDERWATER is larger than at the surface.

So thicker wall at the bottom to resist the pressure.

GOT IT ?   ;)

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