Column I gives the angle at which a force F is applied on a block as shown in the figure.

Column II gives the resulting friction on block.

Now match the given columns and select the correct option from the codes given below.
Coads:
(a)p-a,b,q-a,c,r-a,c
(b)p-a,d,q-a,c,r-b,c
(c) p-a,b,q-b,c,r-b,c
(d)p-a,q-a,b,c,r-b,c

Answer

b

Explanation

[p-a,b] [q-a,c] [r-b,c]

(p) `theta=37^(@),Fsintheta=60 N`
`N=F cos theta=80 N`
`f_(r)=muN=0.1 xx 80=8 N`
force required `=75-60=15 N> f_(1)`
hance friction is kinetic in upward direction.
`(q)theta =45^(@) .N=root50(2)`
`f_(1)=muN=0.1 xx root50(2)=root5(2) N`
`Fsintheta=root50(2)N`
force required `=75-root50(2)=25(3-root2(2))`
`=4.29N so,f`=4.29uarr`(static)
`(r)theta=53^(@),Fsintheta=80N,N=Fcostheta=60 N`
`f_(1)=muN=0.1 xx 60 =6 N`
Force required `80-75=5 N `f=5darr`(static)