Above water surface

If we remove the stone from the water, we apply a force of 120N. How much force will we have to exert if we move the stone above the water surface? The density of the stone is 5000 kg/m ^ 3.

Correct answer:

F2 =  150 N

Step-by-step explanation:

F1=120 N g=10 m/s2 ρ1=5000 kg/m3 ρ2=1000 kg/m3  m=ρ V F=m g  F1=ρ1 V gρ2 V g  V=F1g (ρ1ρ2)=12010 (50001000)=31000=0.003 m3  F2=ρ1 V g=5000 0.003 10=150 N

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