[Dustin]

I'm having trouble setting up basic word problems when dealing with conversions of units or finding certain values. Two examples of the sort of problems that I'm dealing with are:

1. The Volume of a well is 40.00 ft^3. How many kg of cement will it take to fill the pipe if the density of cement is 2.95g/cm^3?



2. Newer copper pennies actually contain very little copper. A new penny is 97.3% Zinc and 2.7% copper by mass. What is the density of a new penny if the density of pure copper is 8.95g/cm^3 and pure zinc is 7.14 g/cm^3?




I already have the answers to these problems, but I can't figure out how to set them up to get to the right answers. We are supposed to be using Conversion factors and dimensional analysis.


All help is appreciated. Thanks.

[Dustin]

I understanding setting up basic problems where I use conversion factors and dimensional analysis, but my main problem is setting up these more difficult problems. Just setting them up for me is the issue.

[sjb]

I'm having trouble setting up basic word problems when dealing with conversions of units or finding certain values. Two examples of the sort of problems that I'm dealing with are:

1. The Volume of a well is 40.00 ft^3. How many kg of cement will it take to fill the pipe if the density of cement is 2.95g/cm^3?

For instance, how many cm³ are there in 1 ft³? How many g in 1 kg?