Question

Three blocks, each of same mass m, are connected with wires W₁ and W₂ of same cross-sectional area a and Young’s modulus Y. Neglecting friction the strain developed in wire W₂ is

(a)   2mg/3ay

(b)  3mg/2ay

(c)  1mg/3ay

(d)  3mg/ay

Answer 1

Correct option  (a) 2mg/3ay

Explanation:

If the system moves with acceleration a and T is the tension in the string W₂ then by comparing this condition from standard case