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paglia

  • 4 years ago

Consider an object describing an elliptical path in the plane given by r (t) = (2 cos t, 6sin t), where t is in the interval [0, 2]. if the object is subjected to a field with a force given by the expression G (x, y) = (4xy, y^2), calculate the work done by G to move the object along the trajectory from (2, 0) to (0, 6), in direct order.

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  1. myko
    • 4 years ago
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    \[W = \int\limits Gdr\]

  2. myko
    • 4 years ago
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    just not sure which expression will make easyer to calculate the dot product, paramtric or cartesian.

  3. myko
    • 4 years ago
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    probably parametric

  4. paglia
    • 4 years ago
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    I tried parametric, though it would be easier.

  5. eliassaab
    • 4 years ago
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    Use Polar Coordinate x(t)= 2 cos(t) y(t)= 6 sin(t) P = 4 x y Q = y^2 Compute P(x(t),y(t)) x'(t) + Q(x(t),y(t))x'(t)=120 cos(t) sin^2(t) Integrate the last expression for t= to Pi/2 to obtain 40

  6. eliassaab
    • 4 years ago
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    This Q(x(t),y(t))x'(t) should be Q(x(t),y(t))y'(t)

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