Calculate Tension in String Supporting Copper Block

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Homework Help Overview

The problem involves calculating the tension in a string that supports a solid copper block with a mass of 1 kg, which is fully immersed in water. The relevant densities are provided: the density of copper is 9,000 kg/m³ and the density of water is 1,000 kg/m³.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the components affecting tension, including the weight of the block and buoyant force (upthrust). There is uncertainty regarding the calculation of volume and the role of surface area, as well as how to derive the necessary quantities from the given data.

Discussion Status

The discussion is ongoing, with participants questioning the assumptions in the problem and exploring how to calculate the volume of the block using its mass and density. Some guidance has been offered regarding the relationship between mass, density, and volume, but no consensus has been reached on the approach to take.

Contextual Notes

There is a noted lack of information regarding the surface area and volume of water, which some participants express confusion about. Additionally, previous posts indicate a need for participants to show attempts at solving the problem to receive further assistance.

luckyme
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Homework Statement



a string supports a solid copper block off mass 1kg(density= 9*103 kgm3) which is completely immersed in water ( density= 1*103kgm3). calc the tension in the string.

Homework Equations



don`t know

The Attempt at a Solution



no clue.
 
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luckyme said:
no clue.

luckyme, we do not do your work for you here on the PF. We can offer tutorial assistance, but you *must* attempt to do the work first. Your other threads with no attempts at working the problems have been deleted. You may re-post them if you show some work.

Now, what are the two components that go into the tension on the string? The weight of the block (in air), and what?
 
the question doesn't say abt surface area. would you work out the upthrust first . don't know volume of water either, don't undstand the componetns.
 
luckyme said:
the question doesn't say abt surface area. would you work out the upthrust first . don't know volume of water either, don't undstand the componetns.

You are given the mass and density of the block. How would you use those to calculate the volume of the block? Use the units to keep your calculation straight.
 
maybe divide by a cubic meter.
 
luckyme said:
maybe divide by a cubic meter.

Don't guess. Use the quantities given, and look at their units. Carry the units along in your calculations along with the numbers, to be sure that you are doing the correct things to get the answer you want.

The units of mass are kg.

The units of density are kg/m^3.

The units of volume are m^3.

What equation could you write to get the volume from the density and mass?

V = ? / ?
 

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