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Radial fields and spheres Consider the radial field
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- Mass-Spring System The mass in a mass-spring system see figure is pulled downward and then released, causing the system to oscillate according to x(t)=a1sint+a2cost where x is the displacement at time t,a1 and a2 are arbitrary constant, and is a fixed constant. Show that the set of all functions x(t) is a vector space.arrow_forwardFlux across curves in a vector field Consider the vector fieldF = ⟨y, x⟩ shown in the figure.a. Compute the outward flux across the quarter-circleC: r(t) = ⟨2 cos t, 2 sin t⟩ , for 0 ≤ t ≤ π/2.b. Compute the outward flux across the quarter-circleC: r(t) = ⟨2 cos t, 2 sin t⟩ , for π/2 ≤ t ≤ π.c. Explain why the flux across the quarter-circle in the third quadrant equals the flux computed in part (a). d. Explain why the flux across the quarter-circle in the fourth quadrant equals the flux computed in part (b).e. What is the outward flux across the full circle?arrow_forwardFlux across the boundary of an annulus Find the outward flux of the vector field F = ⟨xy2, x2y⟩ across the boundary of the annulusR = {(x, y): 1 ≤ x2 + y2 ≤ 4}, which, when expressed in polar coordinates, is the set {(r, θ): 1 ≤ r ≤ 2, 0 ≤ θ ≤ 2π}arrow_forward
- Line integrals of vector fields in the plane Given the followingvector fields and oriented curves C, evaluate ∫C F ⋅ T ds. F = ⟨-y, x⟩ on the parabola y = x2 from (0, 0) to (1, 1)arrow_forwardLine integrals of vector fields on closed curves Evaluate ∮C F ⋅ dr for the following vector fields and closed oriented curves C by parameterizing C. If the integral is not zero, give an explanation. F = ⟨x, y⟩; C is the circle of radius 4 centered at the origin orientedcounterclockwise.arrow_forwardLine integrals of vector fields in the plane Given the followingvector fields and oriented curves C, evaluate ∫C F ⋅ T ds. F = ⟨-y, x⟩ on the semicircle r(t) = ⟨4 cos t, 4 sin t⟩ , for 0 ≤ t ≤ πarrow_forward
- Flux of the radial field Consider the radial vector field F = ⟨ƒ, g, h⟩ = ⟨x, y, z⟩. Is the upward flux of the field greater across the hemisphere x2 + y2 + z2 = 1, for z ≥ 0, or across the paraboloid z = 1 - x2 - y2, for z ≥ 0?Note that the two surfaces have the same base in the xy-plane and the same high point (0, 0, 1). Use the explicit description for the hemisphere and a parametric description for the paraboloid.arrow_forwardLine integrals of vector fields on closed curves Evaluate ∮C F ⋅ dr for the following vector fields and closed oriented curves C by parameterizing C. If the integral is not zero, give an explanation. F = ⟨x, y, z⟩; C: r(t) = ⟨cos t, sin t, 2⟩ , for 0 ≤ t ≤ 2πarrow_forwardTilted disks Let S be the disk enclosed by the curveC: r(t) = ⟨cos φ cos t, sin t, sin φ cos t⟩ , for 0 ≤ t ≤ 2π, where 0 ≤ φ ≤ π/2 is a fixed angle. Consider the vector field F = a x r, where a = ⟨a1, a2, a3⟩ is aconstant nonzero vector and r = ⟨x, y, z⟩. Show that the circulationis a maximum when a points in the direction of the normal to S.arrow_forward
- Tilted disks Let S be the disk enclosed by the curveC: r(t) = ⟨cos φ cos t, sin t, sin φ cos t⟩ , for 0 ≤ t ≤ 2π, where 0 ≤ φ ≤ π/2 is a fixed angle. What is the circulation on C of the vector field F = ⟨ -y, -z, x⟩ as a function of φ? For what value of φ is the circulation a maximum?arrow_forwardRadial fields and zero circulation Consider the radial vectorfields F = r/ | r | p, where p is a real number and r = ⟨x, y, z⟩ .Let C be any circle in the xy-plane centered at the origin.a. Evaluate a line integral to show that the field has zero circulation on C.b. For what values of p does Stokes’ Theorem apply? For those values of p, use the surface integral in Stokes’ Theorem to show that the field has zero circulation on C.arrow_forward
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