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BITSAT EXPLORER

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when a block of mass 2 kg rests on a rough inclined plane making an angle of 30 degree with the horizontal.coeff. of static friction is 0.7 the frictional force on the block is.....

in the book the answer is given as 0.7 x 9.8. x ?3

but i think that since the static frictional force is variable and sice the block is at rest  it should balance the force mgsin?  therefore it should be equal to mgsin? = 2 x 9.8 x 1/2 = 9.8
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ya i also want to know the cut offs
i only managed  80
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i think physics was really very very tough, much tougher than aieee
half of my time was wasted in physics alone n i did nt  get the time to do maths  and  could only attempt  15  questions  of maths
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well done
thanks
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ya  b  is the correct option
but does anyone have an explanation
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If r>p>q,the number of different selections of p+q things taken r at a time, where p things are identical and q other things are identical, is
a.p+q-r        b.p+q-r+1
c.r-p-q+1     d.none of these

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