Bulk modulus of copper = B = 1.4 x 1011 N/m2
Initial edge length of the copper cube = L1 = 85.5 cm = 0.855 m
Final edge length of the copper cube = L2 = 85 cm = 0.85 m
Initial volume of the cube = V1
V1 = L13
V1 = (0.855)3
V1 = 0.625 m3
New volume of the cube = V2
V2 = L23
V2 = (0.85)3
V2 = 0.6141 m3
Change in volume of the cube = V
V = V1 - V2
V = 0.625 - 0.6141
V = 0.0109 m3
Stress applied to the cube = P
P = 2.441 x 109 N/m2
Stress applied to the copper cube to reduce its edge length from 85.5 cm to 85 cm = 2.441 x 109 N/m2
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