Answer:
estimate the time since construction of the bridge is 6.66 year
Step-by-step explanation:
given data
area of the plate = 750 cm²
corroded away during use = 2.5 kg
corrosion penetration rate = 0.5 mm/year
density of the alloy = 10 g/cm³
solution
we know here area is express as
CPR =
................1
put here value ans we get t
t =
t = 58400 hour
time = 6.66 year