The average stack of 5 pennies is 7 mm tall.
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It depends on what you mean by height - are the coins stacked or arranged side by side? If they're side by side, the dimension is 6*21.21 mm = 127.26 mm If they're stacked, the dimension is 6*1.95 mm = 11.70 mm
A standard penny is about 1.52 millimeters thick. To make a foot, which is 12 inches or 304.8 millimeters, you would need approximately 200 pennies stacked on top of each other (304.8 mm divided by 1.52 mm per penny). So, around 200 pennies will make a stack that reaches one foot high.
A penny has a thickness of 1.55 mm, so 5 cm = 50 mm. (50 mm)/(1.55 mm) = 32.26, so 32 pennies will be slightly less than 5 cm (4.96 cm)
One penny (U.S.) is 1.55 mm or .061 inches thick. One million pennies are 1,550,000 mm or 61,023.622 inches tall, stacked one atop another. 1,550,000 mm = 1,550 m = 1.5 km 61,023.622 inches = 5,085.302 feet = 0.96 miles Not quite as impressive as I had expected.
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