Physics, still don't get it!
posted by Mary
The "karat" is a dimensionless unit that is used to indicate the proportion of gold in a goldcontaining alloy. An alloy that is one karat gold contains a weight of pure gold that is one part in twentyfour. What is the volume of gold in a 20.0 karat gold necklace whose weight is 1.09 N?
For Further Reading
Physics  DrRuss, Friday, April 6, 2007 at 1:24am
The sequence here is..
The implication in the question is to find out how much of the weight is gold, so do this using the fraction given.
Convert the weight to mass using F=ma and I would use a=9.8 m s^2 unless your question/text book has a different value.
Now convert the mass to volume using density=mass/volume. The density of gold you will need to get from a data book, wikipedia, or maybe it is in the question/text book.
Please clarify this explanation.
Could post what you have done so far?
F = ma
F/a = m
20.0/ 9.81 = 2.0387
density = mass/volume
volume = mass / 19300
volume = 0.0001056
This answer is incorrect. I am confused!
in your
mass=weight/g you put 20 for weight, That is not correct, it was given as about one newton.
Correct that, then 20/24 of that mass is gold.
Take the mass of gold, divide by the density of gold (look it up), and you have volume of gold.
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