Converting Units: Solving a Simple Density Problem

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Homework Help Overview

The problem involves converting units to demonstrate that a cube of water with a side length of 10 cm has a mass of 1 kg, using the given density of water as 1000 kg/m³.

Discussion Character

  • Exploratory, Mathematical reasoning, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply the formula for mass using volume and density but encounters an issue with unit conversion, leading to a discrepancy in the expected result.

Discussion Status

Participants are engaging in clarifying the steps involved in the calculations. Some guidance has been offered regarding separating operations and focusing on powers of ten, while the original poster reflects on a mistake made during the calculation process.

Contextual Notes

The discussion highlights potential confusion with unit conversions and the importance of careful calculation, particularly with powers of ten. There is an acknowledgment of a specific error made by the original poster in their calculations.

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Homework Statement


The density of water is given to be 1000kg/m^3 use unit conversion to show a cube of water with a side length of 10cm has a mass of 1kg.

Homework Equations


mass=volume x density

The Attempt at a Solution


1000kg/m^3*1000cm^3*1m/100cm*1m/100cm*1m/100cm=.01kg all meters and centimeters should cancel only leaving kilograms and the 1000cm^3 is the volume of the cube if each side is 10cm. So if you use the formula and multiply the volume and density then cancel the length units I should get 1kg according to the book but I'm 10 times too small. What did I do wrong?
 
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Try separating the operations with parentheses. Might help to put away the calculator --- it's all powers of 10.
 
Thanks for the reply but I tried that and I still get the wrong answer
 
One step at a time, then; "100x100?"
 
Ah yes I see thanks for your help the actual problem was that when I did 10000/100 it gives 100 but I thought that I didn't hit the button because it looks like the 100 never changed so it was a weird mistake on my part.
 

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