- #1
chwala
Gold Member
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- Homework Statement
- See attached. This was straightforward. I am looking at an alternative approach hence sharing the post for insight.
- Relevant Equations
- Double integration .
Also,
$$V=\dfrac{1}{4} \int_4^0 \left[\int_{2-0.5y}^2 (4-2x-y) dx\right] dy$$
$$V=\dfrac{1}{4} \int_4^0\left [4x-x^2-xy]^2_{2-0.5y} \right] dy$$
$$V=\dfrac{1}{4} \int_4^0 \left [(4-2y)-(4(2-0.5y)-(2-0.5y)^2-(2-0.5y)y] \right] dy$$
$$V=\dfrac{1}{4} \int_4^0 \left [(4-2y)-(2-0.5y)^2 \right] dy$$
$$V=\dfrac{1}{4} \int_4^0 \left [\dfrac {-1}{4} y^2\right] dy =\left[\dfrac{-y^3}{48}\right]_4^0=0+\dfrac{64}{48}=\dfrac{4}{3}$$
Bingo!! cheers any insight welcome.
...below is my first attempt that is clearly wrong...i corrected it my final post above... i had used wrong limits on my working...
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