In the case of a ball in water, we don't treat water or whatever fluid around it as another object. Reaction force (normal force in the case of gravity) only works when two objects meet on a surface buoyant force is different from reaction force 2 0 kg ) g (Plug in numbers. Convert diameter to radius!) F, start subscript, T, end subscript, equals, left parenthesis, 1, point, 23, start fraction, start text, k, g, end text, divided by, start text, m, end text, cubed, end fraction, right parenthesis, open bracket, start fraction, 4, divided by, 3, end fraction, pi, left parenthesis, start fraction, 3, point, 50, start text, space, m, end text, divided by, 2, end fraction, right parenthesis, cubed, close bracket, g, minus, left parenthesis, 9, point, 20, start text, space, k, g, end text, right parenthesis, g, start text, left parenthesis, P, l, u, g, space, i, n, space, n, u, m, b, e, r, s, point, space, C, o, n, v, e, r, t, space, d, i, a, m, e, t, e, r, space, t, o, space, r, a, d, i, u, s, !, right parenthesis, end text
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