This is a place for students to communicate with Mr. Hayward, and other students, in an educational and creative manner. Enjoy!
Monday, February 7, 2011
Grade 8 Science February 8, 2011
Fantastic Fluids is our unit of study:
Here is the question; Water has a density of 1.0 g/mL... gold has a density of 19.32 g/cm^3. What volume would a 4.6g chunk of gold need to occupy to float?
Your idea was a good one, (I think you added an order of magnitude...one too many decimal moves) but you are making the assumption that the bar of Gold still has a density of 19.32... while this is true for most situations, you don't want it to be!
by my calculations....
ReplyDelete:)
V = M/D
4.6g / 19.32 g/cm^3
=0.02380952 cm^3
rounded 0.024 cm^3
The 4.6g chunk of gold would need a volume of 0.024 cm^3 to float.... I hope!
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ReplyDeleteYour idea was a good one, (I think you added an order of magnitude...one too many decimal moves) but you are making the assumption that the bar of Gold still has a density of 19.32... while this is true for most situations, you don't want it to be!
ReplyDeleteby my RE-calculations...(:
ReplyDeleteyou would need a volume of 1.1 to float the gold chunk but that still make no sense i am submitting it any ways! :)