#Anyone help on this year 1 volumes of revolution question

51 messages · Page 1 of 1 (latest)

bitter cypress
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<@&791435371564892232> isn't this weird

Screenshot_2024-05-10_at_20.23.34.png
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@toxic lintel

grizzled relic
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the answer is wrong

bitter cypress
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did they use the wrong equation or something

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I KNEW IT

grizzled relic
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they changed the question but forgot to change the mark scheme

bitter cypress
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😭 absolute idiots

grizzled relic
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A should be 5

bitter cypress
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a should be 4

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cause youre rotating y axis

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you need x coordinates

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it intersects at (4,3)

grizzled relic
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you need y co-ordinates for rotating about the y axis

bitter cypress
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that will be 0

grizzled relic
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0 to 5

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which is why the lowerbound is 0

bitter cypress
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huh

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strange

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it should be 4

grizzled relic
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you're rotating about the y axis

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not the x axis

grim star
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But I don’t get the rest…

bitter cypress
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it says y axis

grizzled relic
bitter cypress
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not x axis

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(0,5) (4,3)

grizzled relic
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so you integrate from y=0 to y=5

grim star
grizzled relic
bitter cypress
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umm you confused me wrong

grim star
grizzled relic
grim star
grizzled relic
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they updated the q but just forgot to change a few things

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i imagine their intention was for B to be the volume of the cylinder /pi

grim star
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It looks nothing like the real as 2023 papers question either, it’s so strange

grizzled relic
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but since you're integrating from y=0 you can't do that

grim star
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Would you integrate from 3-5 then add the cylinder then?

grizzled relic
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yeh

grim star
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So the question is completely wrong lol

grizzled relic
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yeh

grim star
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Thanks for that, have a good night

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@bitter cypress is it ok if I close this?

bitter cypress
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ok

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oh yh

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💀

grim star
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Thanks for the help too @bitter cypress

bitter cypress
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you need y coordinates

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btw @grizzled relic it should be 5,3 the range

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oh ffs why do they make this mistake