IGCSE physics help please

[ImmyNelson]

i have been doing past paper 3's and im stuck with october/november 2010 question 2b. I don't understand the markscheme's answer. could someone please explain to me?

 

[salma_69]

i have been doing past paper 3's and im stuck with october/november 2010 question 2b. I don't understand the markscheme's answer. could someone please explain to me?

which varient??

 

[ImmyNelson]

ooops. 33

 

[salma_69]

ooops. 33

u will need to be knowing that the sum of clockwise moments is equal to the anticlockwise moments that is (f1 x d1=f2 x d2). F1=160 which is the weight of the board and d1 will be the distance from the centre of this board to the support P which will be 0.5+0.25+0.03 whish ishalf the thickness of P. F2 is what we are looking for and d2 will be 0.2 -0.03. F2 =(160*0.78)/0.17.
Hope you understood and didn't get confused...

 

[ImmyNelson]

but the board tipped doesn't that mean it wasnt equal?

 

[Asad.Babur]

I bought Physics O level Book with disc, somehow lost the disc. Anyone please send me the internal files, i need files of cd not book.
David Sang wali.

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