# What is the buoyant force acting on the rock?

#### 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
????

Related Introductory Physics Homework Help News on Phys.org

#### G01

Homework Helper
Gold Member
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.

#### mike2007

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

### Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving