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Cost of painting a vessel

  • Thread starter Amith2006
  • Start date
  • #1
427
2

Homework Statement



The inner and outer radii of a hollow steel hemispherical vessel are 2 cm and 3 cm respectively.what is the total cost of painting the vessel all over at the rate of 70 cents per cm² ?



[ b]2. Homework Equations [/b]
Curved surface area of hemisphere=2[pi]*[radius]²

The Attempt at a Solution


total Surface area= 2[pi]*{[inner radius]² + [outer radius]²}
TOTAL cost = 0.7*total Surface area

is it right?
 

Answers and Replies

  • #2
287
0
Yes, but you can't forget about the rim, with area PI ( [outer radius]^2 - [inner radius]^2 )
 
  • #3
427
2
Yes, but you can't forget about the rim, with area PI ( [outer radius]^2 - [inner radius]^2 )
u got a point.i was just falling short of the answer by an iota. Thanks buddy.
 

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