1) By measuring the diameter with a ruler and approximating
the thickness of a penny, you can calculate its **volume **using geometry.**V= pr**^{2}t = (3.1416)r^{2}t
2) By measuring the volume of water displaced by a number
of coins. You can do this by adding a given volume of water to a graduated cylinder,
adding the pennies and remeasuring the new volume. Since pennies are not soluble in water,
they displace their own volume.
Metals can be differentiated by their Density. After you
and your fellow students finish your measurements, you should be able to determine the
composition of a new U.S. penny. You should also learn something about the change in
composition of a penny over the last three decades.
**Aluminum** |
**2.70 g/cc** |
**Copper** |
**8.92 g/cc** |
**Iron** |
**7.86 g/cc** |
**Lead** |
**11.34
g/cc** |
**Zinc ** |
**7.13 g/cc** |
For typical student weight vs date
measurements, see the.......**PENNY-DATE
GRAPH**
© R.W. Kluiber 1/14/2000 |