Converting Units: Solving a Simple Density Problem

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SUMMARY

The discussion centers on solving a density problem involving the conversion of units for a cube of water with a side length of 10 cm. The density of water is established as 1000 kg/m³, and the formula mass = volume x density is applied. The user initially miscalculates the mass as 0.01 kg due to errors in unit conversion and arithmetic operations. After clarification, the correct mass of the cube is confirmed to be 1 kg, demonstrating the importance of careful unit handling and arithmetic accuracy in physics problems.

PREREQUISITES
  • Understanding of density and its formula (mass = volume x density)
  • Familiarity with unit conversions between metric units (cm to m)
  • Basic arithmetic operations, including multiplication and division
  • Knowledge of volume calculation for geometric shapes (volume of a cube)
NEXT STEPS
  • Review unit conversion techniques in physics, focusing on metric units
  • Practice calculating mass using density with different shapes and dimensions
  • Explore common pitfalls in arithmetic operations in physics problems
  • Learn about dimensional analysis to verify calculations in physics
USEFUL FOR

Students studying physics, particularly those tackling problems involving density and unit conversions, as well as educators looking for examples of common calculation errors in physics homework.

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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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