Math  /  Calculus

QuestionFind a function FF such that F=f\mathbf{F} = \nabla f, where F(x,y)=2x,4y\mathbf{F}(x, y) = \langle 2x, 4y \rangle, and CC is the arc of the parabola x=y2x = y^2 from (4,2)(4, -2) to (1,1)(1, 1).

Studdy Solution
Calcular el trabajo a lo largo de la curva CC usando la función potencial.
Dado que el campo es conservativo, el trabajo es la diferencia de potencial entre los puntos finales:
W=f(1,1)f(4,2) W = f(1, 1) - f(4, -2)
Calcular f(1,1)f(1, 1):
f(1,1)=12+2(1)2+C=1+2+C=3+C f(1, 1) = 1^2 + 2(1)^2 + C = 1 + 2 + C = 3 + C
Calcular f(4,2)f(4, -2):
f(4,2)=42+2(2)2+C=16+8+C=24+C f(4, -2) = 4^2 + 2(-2)^2 + C = 16 + 8 + C = 24 + C
Calcular el trabajo:
W=(3+C)(24+C)=3+C24C=21 W = (3 + C) - (24 + C) = 3 + C - 24 - C = -21
El trabajo realizado a lo largo de la curva CC es:
21 \boxed{-21}

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