4. A hollow sphere of inner radius 8.0 cm and outer radius 9.0 cm floats half submerged in a liquid of specific gravity 0.80. Find the density of the material of which the sphere is made.
(A) 2.1×10³ kg/m³
(B) 1.3×10³ kg/m³
(C) 1.5×10³ kg/m³
(D) 1.7×10³ kg/m³
(E) 1.9×10³ kg/m³
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統計: A(0), B(2), C(0), D(0), E(0) #3384038
統計: A(0), B(2), C(0), D(0), E(0) #3384038