Mass of Surface: Find Double Integral over S

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SUMMARY

The discussion focuses on calculating the mass of a surface defined by the double integral of the function ρ = x*y over the surface S, which is part of the cylinder defined by x² + z² = 9 in the first octant and contained within the cylinder x² + y² = 4. Participants emphasize the importance of visualizing the shape from a top-down perspective to accurately define the bounds of integration. The integration requires careful consideration of the geometric constraints imposed by the cylinders.

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  • Understanding of double integrals in multivariable calculus
  • Familiarity with cylindrical coordinates
  • Knowledge of surface area calculations
  • Ability to visualize geometric shapes in three dimensions
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Homework Statement


If the mass per unit area of a surface is given by rho = x*y, find the mass
double integral over S of x*y dS if S is the part of the cylinder x^2 + z^2 = 9 which is in the first octant and contained within the cylinder x^2 + y^2 = 4.

Homework Equations


Above.

The Attempt at a Solution


I can visualize what the shape looks like, but I'm not sure how to define the bounds of integration based on the shape described.
 
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does anyone have any ideas? help would be greatly appreciated.
 
Make sure you're visualizing the shape from a useful viewpoint. I suggest looking "from above." In other words, draw the xy-plane as usual on your paper, position your eye directly above the origin, and imagine the z-axis pointing straight out at your eye. Shade the region in the xy-plane that is covered by the surface.
 

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