2023 HSC chat (8 Viewers)

[Average Boreduser]

After,
Water is flowing into a hemispherical container of radius 10cm at a constant rate of 6cm^3 per second. It is known that the formula for the volume of a solid segment cut off a sphere is V=pi/3 h^2 (3r-h), Where r is the radius of the sphere and h is the height of the segment.
a) Find the rate at which the height of the water is rising when the water height is 2cm.
b) Use Pythag to find the radius of the circular water surface when the height is h, and hence find the rate of increase of the surface area when the water height is 2cm.

 

[howcanibesmarter]

pls recommend some good pens i can buy to make my handwriting faster for trials

i currently use uniball jetstream 0.7mm for english, and for maths i use what scaryshark uses

 

[howcanibesmarter]

After,
Water is flowing into a hemispherical container of radius 10cm at a constant rate of 6cm^3 per second. It is known that the formula for the volume of a solid segment cut off a sphere is V=pi/3 h^2 (3r-h), Where r is the radius of the sphere and h is the height of the segment.
a) Find the rate at which the height of the water is rising when the water height is 2cm.
b) Use Pythag to find the radius of the circular water surface when the height is h, and hence find the rate of increase of the surface area when the water height is 2cm.

is the answer a) 0.053cm/sec b) 2.67sqcm/sec?

 

[nsw..wollongong]

pls recommend some good pens i can buy to make my handwriting faster for trials

pentel energel 0.7
my holy grail, doesn't smudge at all

 

[Average Boreduser]

is the answer a) 0.053cm/sec b) 2.67sqcm/sec?

yea

 

[synthesisFR]

pentel energel 0.7
my holy grail, doesn't smudge at all

nah cuz ive acually been using the trashiest pen in existence so far idek why
is this even true like if i can use a trash one i will be able to use a good pen much better or not true in this case? since u might need to adapt to a good pen lmfao

 

[Average Boreduser]

yea

 

[synthesisFR]

View attachment 38797

why r u quoting random questions

 

[Average Boreduser]

why r u quoting random questions

idk

 

[nsw..wollongong]

nah cuz ive acually been using the trashiest pen in existence so far idek why
is this even true like if i can use a trash one i will be able to use a good pen much better or not true in this case? since u might need to adapt to a good pen lmfao

bro i used a rlly bad pen on my prelims and literally all my feedback on my English paper was how i HAVE to change pens honestly it doesn't matter if u use a bad pen now and a good one later, it doesn't make u write better in the actual test (different pen grip, ink??). just pick one or two and stick with them

 

[synthesisFR]

bro i used a rlly bad pen on my prelims and literally all my feedback on my English paper was how i HAVE to change pens

casually flexes how good she is at english

 

[Average Boreduser]

casually flexes how good she is at english

subtle but very clear/transparent flex.

 

[nsw..wollongong]

casually flexes how good she is at english

or its just that my English teachers are shit at giving feedback so they focus on the most tedious details instead

 

[scaryshark09]

or its just that my English teachers are shit at giving feedback so they focus on the most tedious details instead

omg lol, most of my English feedback is literally copied and pasted from the marking criteria but they just change a few words here and there like "skillfully" to "effectively" to justify why i didnt get full

 

[howcanibesmarter]

idk

cus i will do them all is the answer = -x+3/sqrt2 tan^-1(sqrt2 tanx/2) + C ?

also is there a faster way? i feel like im missing something...

 

[Average Boreduser]

cus i will do them all is the answer = -x+3/sqrt2 tan^-1(sqrt2 tanx/2) + C ?

also is there a faster way? i feel like im missing something...
View attachment 38802

nah its a last qn I found from a past paper lol. idek how to integrate.... in fact, my school only just started diff

this is the answer

 

[Average Boreduser]

and yeah i think ur right given tan^-1(tanx)=x (unless theres smn im missing? idk)

 

[howcanibesmarter]

and yeah i think ur right given tan^-1(tanx)=x (unless theres smn im missing? idk)

ye it is tyty

 

[yolo tengo]

pls recommend some good pens i can buy to make my handwriting faster for trials

pls i need the recs roo the pen literally determines my handwriting no cap

 

[yolo tengo]

View attachment 38797

what the HECK is that i havent learnt that yet im scared now