Machine-translated by Google. Questions are authored in English.
Top

Discussion

None of these four integrals gives an area except

  • A.\( \displaystyle\iint_{R} \left(x^{2}+y^{2}\right)dA \)
  • B.\( \displaystyle\iint_{R} dA \)
  • C.\( \displaystyle\iint_{R} x\,dA \)
  • D.\( \displaystyle\iiint dV \)

Answer: B

Only the unit integrand accumulates area itself. Weighting by \( x \) gives a first moment, whose dimensions are a length cubed; weighting by \( x^{2}+y^{2} \) gives a second moment; and the triple integral of unity gives a volume. Each of those three answers a different question about the same region

No comment is present. Be the first to comment.
Loading…

Post your comment

Please log in or register to post a comment.