aluminum boat 14,5g volume 450cm3, how many pennies at 2.5g until boat sinks

Answer 1

Wt. = V * Dw
Wt. = 450cm^3 * 1g/cm^3 = 450 g = Max.
wt. without sinking.

14.5 + X = 450 Grams.
X = 435.5 grams can be added.

435.5/2.5 = 174.2 or 174 Pennies.