No, only in the 1970s.
No. The only cents ever struck in aluminum were some test pieces made in 1974. None are know to have been put in circulation.
Only one penny is required, if it is moving fast enough to puncture the hull. If you are talking about the weight of the pennies, then aluminum boats come in various sizes, so they do not all have the same penny carrying capacity. A ten foot long aluminum rowboat can carry a million pennies without sinking. Try it.
Make a Submarine
An Australian 1953 Penny minted in Perth has a dot (.) after the (A) in AUSTRALIA (AUSTRALIA.). All other Pennies were minted in Melbourne and have no mintmark.
100 pennies make $1.00 200 pennies make $2.00 and so on.
100 pennies make a dollar so there are 50,000 pennies in 500 dollars
3 trillion pennies make 3 trillion pennies. 300 trillion pennies make 3 trillion dollars.
It takes a million pennies to make a million pennies. It takes one hundred million pennies to make a million dollars.
5 pennies make a nickel.
If you refer to the "diamonds" on the obverse side of Australian Pennies (and all other Australian coins from 1953 to 1964), they are merely a spacer. The function was previously performed by a semicolon and/or a full stop on pre-1953 coins.
a dollar is 100 pennies 5 dollars is 500 pennies
10,000 pennies make 1,000