Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Expressing answers answers for numbers and unites.

  1. Nov 1, 2011 #1
    1. The problem statement, all variables and given/known data

    a) The price of gold, according to << Link removed by Moderator >>is currently $27 per gram. It is
    estimated that over the course of history about 170,000 tonnes of gold has been mined,
    what would the current price of all this gold be?
    b) The density of gold is 19.3 g cm^-3. Express it in units of kgm^-3. """

    2. Relevant equations

    Not sure

    3. The attempt at a solution

    a) 4.59 x 10^12 (3 SF)
    Last edited by a moderator: Nov 1, 2011
  2. jcsd
  3. Nov 1, 2011 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    Use the factor label method.

    [tex]\frac{19.3 \ g}{cm^3} \cdot \frac{\text{ ??? } kg}{\text{ ??? } g} \cdot \frac{\text{ ??? }}{\text{ ??? }} = \text{The Answer}[/tex]

    You'll have to figure out what goes in place of all the "???". That is, how do you convert between g and kg? Also, how do you get the cm3 to become m3?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook