Helpppp

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can someone explain what happens in this question?
its from unit1!

june 2012 q7 & jan 2012 q4!
please someone??????.....
 
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can someone explain what happens in this question?
its from unit1!

june 2012 q7 & jan 2012 q4!
please someone??????.....

I'll make my angle to be "A"
__component of weight in the parallel direction
since the object is in Equilibrium overall force acting on that system is Zero (0)
__ WsinA = 0
__therefore component of weight in the parallel plane = Zero (0)


For R
since the object is in Equilibrium overall force acting on that system is Zero (0)
__component of R in the parallel direction
__R is at 90* to the incline plane
_ Rcos90 = 0
_Component of R in the parallel plane is Zero(0)
 
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