UPSEE Solved Model Paper 7

W eight o f the rod = w
Reaction of boy RB =

w

4

Reaction of man RM =

3w

4

As the rod is in rotational equilibrium
∴ Στ = 0
RB×

L

2

−RM×x = 0
⇒

w

4

×

L

4

−

3w

4

×x = 0
⇒ x =

L

6

∴ Distance from other end, y =

L

2

−x
⇒ y =

L

2

−

L

6

=

2L

6

=

L

3