5. The voltage across a device is v(t) = 10 cos(4лt) V and current through a device is 0.1 sin(4πt) mA. a. Determine the instantaneous power p(t). b. Plot the instantaneous

power over the interval t =(0, 0.5 s). On the graph, show where (if) the device is acting as a load. Also, show where (if) it is acting as a source. (You can use a graphing utility such as MATLAB, MATHCAD, Wolfram Alpha, etc.)