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 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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Volume of a cylinder = pi*radius2*height