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A box with a volume V = 0.04 m3 lies at the bottom of a lake whose water has a density of 103 kg/m3.
(a) How much force is required to lift the box, if the mass of the box is 1050 kg?

(b) How much force is required to lift the box, if the mass of the box is 100 kg?

(c) How much force is required to lift the box, if the mass of the box is 70 kg?

figure it out

force=mg(mass*acceleration due to gravity

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