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How much force (in Newtons) does it take to hold a 87 kg man completely under water in the ocean? His density?
How much force (in Newtons) does it take to hold a 87 kg man completely under water in the ocean? His density is 972 kg/m3, and the specific gravity of sea water is 1.07
this is for exam study review...plz help
The forces acting on the person are : His own weight and the buoyant force.
The weight force = 87*9.8 = 872.2 N
The buoyant force = (Density of sea water)*Volume of the man) * g= 1.07*10^3*(87/972)*9.8= 938.561
So, the net upward force = 938.561 - 872.2 = 66.361 N
So, we need to exert this much force downward to stopping him from rising in the water.
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