A solid conical bar of circular cross-section is suspended vertically as shown in the figure. The diameter of the bar at the base, D, equals 100 mm and its length, L is 0.5 m. If E = 200 GN/m2 and its weight per unit volume is 80 kN/m3,the elongation of the bar under self-weight is

A solid conical bar of circular cross-section is suspended vertically

1.	A solid conical bar of circular cross-section is suspended vertically as shown in the figure. The diameter of the bar at the base, D, equals 100 mm and its length, L is 0.5 m. If E = 200 GN/m2 and its weight per unit volume is 80 kN/m3,the elongation of the bar under self-weight is
A.	1.50 × 10-6 mm
B.	1.67 × 10-5 mm
C.	1.71 × 10-6 mm
D.	1.87 × 10-5 mm
Answer» C. 1.71 × 10-6 mm