Question

A chain of mass 10 kg and length 10 metre is held vertical by fixing its upper end to a rigid
support. The tension in the chain at a distance 3 metre from the rigid support is
(A) 100 N
(B) 70 N
(C) 143 N
(D) 76 N
A force of 10 N acts on a block The acceleration of the
a = 7 m/s2​

Answer 1

The tension in the chain at a distance 3 metre from the rigid support is 70 N.

Explanation:

Total weight of the chain =10 Kg

Mass per unit length =10/10 Kg per meter

                                  = 1 Kg per meter

Now at a distance of 3 m from the support, the force experienced is due to the remaining chain hanging down i.e. 7 m.

Weight of the chain = 1 Kg/m x 7=7 KG

The force experienced = F =mg

                                      = 7 x 10 = 70 N

Thus the tension in the chain at a distance 3 metre from the rigid support is 70 N.

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