Question

A sphere of solid material of relative density 9 has a concentric spherical cavity and sinks in water. If the radius of the sphere be R, then the radius of the cavity (r) will be rriated to R as

• A. $r^3=\frac{8}{9}R^3$
• B. $r^3=\frac{2}{3}R^3$
• C. $r^3=\frac{\sqrt8}{3}R^3$
• D. $r^3=\sqrt{\frac{8}{3}}R^3$

Answer 1

Answer: (A)

$r^3=\frac{8}{9}R^3$

Answer 2

$F_h = V_{imm} \times \rho_L \times g$