Question: State whether the divergence of the following vector fields is positive, negative, or zero: (a) the thermal energy flow in J/(m 2 s) at

State whether the divergence of the following vector fields is positive, negative, or zero:

(a) the thermal energy flow in J/(m2 − s) at any point in a freezing ice cube;

(b) the current density in A/m2 in a bus bar carrying direct current;

(c) the mass flow rate in kg/(m2 − s) below the surface of water in a basin, in which the water is circulating clockwise as viewed from above.

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