What is the buoyant force acting on the rock?

1. Jun 27, 2007

mike2007

A rock with a volume of 0.2m3 is fully sumberged in water with density of 1000kg/m3. What is the buoyant force acting on the rock?

Assume that gravity acts on the system
0.2m3*9.81m/s2 = 1.96
buoyant force = 1000kg/m3*1.96
= 1960N
????

2. Jun 27, 2007

G01

Check the units of your answer. You do not have the correct expression for buoyant force. The buoyant force on an object also depends upon the volume submerged:

$$F_b=\rho g V$$ where V is the volume submerged.

3. Jun 27, 2007

mike2007

Ok, i get it now. makes it a lot clearer.
thanks

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