Social: Do you expect me to talk?

my mark scheme says 10kg, and I have no idea how either were worked out... I do have one idea, I'll give that a shot now 🤺

🙁 i've tried.

the elasticity force is equal ot the gravity force btw

erm..i forgot g so i got 15, not 1.5 bag which is still wrong

OK, it's at the point of tilting about C, meaning C has the upward force of (65+m)g

I'm gonna do moments about A, and see if I can get the mass from there...

💃 yay, I got it 😊

[edit]

TELL ME!!!!!

What, how I got it?

yes.
i want to know. coz in the meantime i got 500 😖

and it intriguing me

OK, back to the diagram:

Add a force of (65+m)g at the point C. Point C is 2.4m away from A, right? (because 4-1.6 = 2.4)

Do Moments About A:

2mg + 160g = 2.4 (65+m)g
Cancel out the g's
2m + 160 = 2.4 (65+m)
Mutliply the bracket
2m + 160 = 156 + 2.4m
160 - 156 = 2.4m - 2m
4 = 0.4m
m = 10kg

i don't understand first line of A's moments cry
where is it from? *feels so stupid* 🙁

Moments about A:

this means that all the forces from any point going clockwise are equal to the forces going anti-clockwise, and therefore keep it in equilibrium (not moving).

If a 5N force is 1 metre away, this is the same as a 1N force that is 5 metres away, which is the same as a 0.5N force 10 metres away

blah 😬

but where you got the 160 from?

Because there is a 40g force which is 4 metres away... 4*40 = 160

thank you.

got it completely? 😄

i know how you make it. i have no idea why is it that why, but nvm.
i'll keep on 'wallowing in self pity' bye 😬

and I'll start teaching myself unit vectors before tomorrow 😊

hug later clovs

teaching yourself? 🤨

schizophrenia !!! 😉

Helooloo Cinderella 😱

Hello Clovie! eyes