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Thank you in advance!

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- Thread starter TorMcOst
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- #1

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Thank you in advance!

- #2

Born2bwire

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- #3

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This means that my calculation will become something like this:

Weight in Air: 13,000 kg

- Weight of fluid displaced (1650 cm3*1,025): 1,691 kg

= Weight in Sea Water: 11,309 kg

Correct?

- #4

Born2bwire

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Yeah, that's how I would work it. We'll see if anyone here ends up disagreeing.

- #5

Astronuc

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Does one mean 13 (13.000) kg, or perhaps 13,000 g? kg (g) is a unit of mass, N (Newton) or dyne (used in cgs system) is a measure of weight. Mass * acceleration of gravity would give weight (force) due to gravity.

This means that my calculation will become something like this:

Weight in Air: 13,000 kg

- Weight of fluid displaced (1650 cm3*1,025): 1,691 kg

= Weight in Sea Water: 11,309 kg

Correct?

The apparent mass in seawater would be 11.309 kg (11,309 g). The application of Archimedes principle (buoyancy) is correct.

In English units, one will find pounds mass (lbm) and pounds force (lbf), but strictly speaking they are not the same.

- #6

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However I got a little confused. By 13,000kg I meant 13 kg (in air). And my following answer was that this bolt would weight 11,3kg in water. Do you agree or disagree with this calculation?

- #7

Born2bwire

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However I got a little confused. By 13,000kg I meant 13 kg (in air). And my following answer was that this bolt would weight 11,3kg in water. Do you agree or disagree with this calculation?

He doesn't like your use of kilograms as a unit of weight. Technically, kilogram is a unit of mass, Newtons would be an appropriate unit of weight.

- #8

Astronuc

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As Born2bwire indicated, I was referring to the use of mass as weight. Being a physics forum, we wish to be accurate in such a matter.

However I got a little confused. By 13,000kg I meant 13 kg (in air). And my following answer was that this bolt would weight 11,3kg in water. Do you agree or disagree with this calculation?

I agree with the calculation that 13 kg of steel as described would have the weight equivalent of 11.3 kg (as measured in air), when the steel is immersed in seawater of density (1025 kg/m

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