For each of the following, say whether you expect the line integral of the pictured vector field over the given curve to be positive, negative, zero, or that the value cannot be determined.

Graph 1Graph 2
Graph of a vector field with vectors that at all points above the x-axis point to the right, with magnitudes that are zero at the x-axis and increasing as y increases. The indicated curve is the top half of a circle centered on the origin, traversed from left to right (clockwise).Graph of a vector field with vectors that at all points above the x-axis point to the right, with magnitudes that are zero at the x-axis and increasing as y increases. The indicated curve is the top half of a circle centered on the origin, traversed from left to right (clockwise).

(Note: For each graph, vectors are shown with a dot at the tail of the vector.)

For Graph 1, the line integral of the vector field over the curve shown is
For Graph 2, the line integral of the vector field over the curve shown is

You can earn partial credit on this problem.