# Posts by Rick_the_chemist

Total # Posts: 3

**Science**

The density of water is 1 g/cm^3. Archimedes' principle says that the "buoyancy" (the upward force) is equal to the weight of water that is displaced. You're only given the density. Therefore, you can assume whatever mass of ice that you wish. If you pick 1 ...

*April 15, 2009*

**math**

X = the cost of MaineCellular's plan P = the cost of Portland Wireless' plan T = time in minutes. X = $12 + $0.10 T P = $20 + $0.05 T P = X at the number of minutes that the two costs cross. So, set X = P $12 + $0.10 T = $20 + $0.05 T Solve for T. Once you have T, ...

*April 15, 2009*

**Physics**

The angles are simple because you have an equilateral triangle. In any triangle, the sum of the internal angles must be 180 degrees. An equilateral triangle is also equiangular. Therefore, the angles are simply 60 degrees each (3 * 60 degrees/angle = 180 degrees) The two ...

*April 15, 2009*

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