- #1
getty102
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Homework Statement
Calculate the work against gravity required to build a structure out of brick. The structure has a square base with 10ft sides and is 20ft high. The density of brick is around 80lb/ft^3
Homework Equations
W=∫F*d
The Attempt at a Solution
First I found the volume where V=(102) Δy
Then I found the mass=(ρ)(V)=(80)(102) Δy
Then I found the force=(gravity)(m)=(32.2)(80)(102) Δy
Then I integrated between 0 and 20 with respect to y=∫(32.2)(80)(102)y dy
which gave me 128800y2 between 0 and 20= 51520000 ft*lb
my answer is not correct and I'm not sure if I'm computing properly.