If your Lincoln Memorial penny has a date before 1982, it is made of 95% copper. If the date is 1983 or later, it is made of 97.5% zinc and plated with a thin copper coating. For pennies dated 1982, when both copper and zinc cents were made, the safest and best way to determine their composition is to weigh them. Solid copper pennies weigh 3.11 grams (+/- 0.130 g.), whereas the copper plated zinc pennies weigh only 2.5 grams (+/- 0.100 g.).
Report Abuse. 1  Vibrations In Abdomen. Source(s): https://shrinkurl.im/a8czv. 2  For the best answers, search on this site https://shorturl.im/awgvM. If by stomach, you mean your abdomen, that's your intestines, and it's probably gas. 3  Sounds like it could just be little bubbles of gas.
Abdominal sounds (bowel sounds) are made by the movement of the intestines as they push food through. The intestines are hollow, so bowel sounds echo through the abdomen much like the sounds heard from water pipes. Most bowel sounds are harmless. They simply mean that the gastrointestinal tract is working. A health care provider can check abdominal sounds by listening to the abdomen with a stethoscope (auscultation). Most bowel sounds are normal.