A corroded metal gusset plate was found on a bridge. It was estimated that the original area of the plate was 750 cm2 and that approximately 2.5 kg had corroded away during use. Assuming a corrosion penetration rate of 0.5 mm/year for this metal, estimate the time since construction of the bridge. The density of the alloy is 10 g/cm3 .

estimate the time since construction of the bridge is 6.66 year

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

the equation above shows how temperature f, measured in degrees fahrenheit, relates to a temperature c, measured in degrees celsius. based on the equation, which of the following must be true?

a temperature increase of 1 degree fahrenheit is equivalent to a temperature increase of

5

9

degree celsius.

a temperature increase of 1 degree celsius is equivalent to a temperature increase of 1.8 degrees fahrenheit.

a temperature increase of

5

9

degree fahrenheit is equivalent to a temperature increase of 1 degree celsius.

a) i only

b) ii only

c) iii only

d) i and ii only