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Bouyancy Question

  • Thread starter robertsa
  • Start date
  • #1
10
0

Homework Statement



Fossilized ichthyosaurus remains enable us to estimate their volume. If we assume that a
3m^3 icthyosaurus was "wightless" when it swam under water. What was its weight in metric tonnes?





plugging this into the equation would give me B .. not weight??

Homework Equations



B=Wdisp. lqd ??

The Attempt at a Solution



B=V x density x g
g=9.81
density= 1000 kg/m^3 (assuming fresh water)
V=3m^3
 

Answers and Replies

  • #2
mgb_phys
Science Advisor
Homework Helper
7,774
12
A floating object displaces it's own weight in water - how much does 3m^3 of water weigh

ps. actually the question is asking for the mass of 3m^3 of water

pps. I would imagine they lived in the sea
 
  • #3
10
0
Soo. 1m^3=1025 kg
3m^3=1025 x 3=3075kg
1kg=0.001metric tonns
3075 x 0.001
=3.075 metric tonnes

its really that simple? haha
 
  • #4
mgb_phys
Science Advisor
Homework Helper
7,774
12
When a question asks for 'weight' in tons you can be sure that not a great deal of thought went into it

For bonus marks you could fin the density of seawater in the early Jurassic
 

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