Question

Masses 8, 2, 4, 2 kg are placed at the corners A, B, C, D respectively of a square ABCD of diagonal 80 cm. The distance of centre of mass from A will be (Approximately)

• A. 20 cm
• B. 30 cm
• C. 40 cm
• D. 60 cm

Answer 1

The correct option is B 30 cm

$b^{\prime }34c{m}^{\prime }$

Centre of mass is given by

$=\frac{(m1x1+m2x2+m3x3+m4x4)}{(m1+m2+m3+m4)}$

therefore centre of mass is

$=\frac{(8\ast 0+2\ast 0.56+4\ast 0.8+2\ast 0.56)}{(8+2+4+2)}=.34$ metres from A