17. A 7.8-kg solid sphere, made of metal whose density is 2500 kg/ m3, is suspended by a cord. When the sphere is immersed in water (of density 1000 kg/m3), what is the tension in the cord?
(A) 16 N
(B) 30 N
(C) 46 N
(D) 61 N
(E) 72 N.
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