What is the density of the stone?

  • Thread starter Nguyenfa.t
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  • #1
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Homework Statement



When a 50 N stone is attached to a spring scale and is
submerged in water, the spring scale reads 35 N. What is the density
of the stone?

Homework Equations





The Attempt at a Solution


I found that the buoyant force is 15 N but i dont know what to do after. Can someone please help me step by step. I need to know this for my final tomm and im stressing out.
 

Answers and Replies

  • #2
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i know it becomes 1000(50)/ 15 but i dont know where the 1000 came from. can someone please help?
 
  • #3
Kurdt
Staff Emeritus
Science Advisor
Gold Member
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Now you know the buoyant force you also know the volume of the boulder is the same as the volume of displaced water. So you can work out its volume in terms of the density of the water. Next you just divide its mass by the volume to find its density.
 

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