Joseph C.

asked • 09/11/20

Help with Physics Question on Density

I've been trying to figure out how to solve this question for some time now and I can't figure it out (picture below), please and thanks.


Brenda D.

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Since cm^3 is the same as ml, and you can look this up, your first density measurement is simply 7.8g/cm^3 since density is g/ml. At the same mass but a different shape you just need to divide by the new density correctly it should give you 0.78g/cm^3. A tenfold decrease in mass per volume. The lower mass/volume should be easier to float. It is so much lighter per cm^3 of water.
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09/11/20

1 Expert Answer

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Douglas B. answered • 09/11/20

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HS and College Math: Clear and to the Point

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1) density is (7.8 g) / (1 cm^3). Now, convert to units of kg/m^3. Note that there are 1000 g in one kilogram, and there are 1,000,000 cm^3 in 1 m^3.


2) same thing, but now volume is 10 times greater (divide the result of 1) by 10).


3) boats are mostly hollow, which greatly decreases their density allowing them to float.

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Joseph C.

Thank you Douglas, much thanks. I've been having problems with it.
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09/11/20

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