State with reasons whether the following signals are periodic or aperiodic. For periodie Q3. signals, find the period and state which of the harmonics are present in the series. (a) 2 sin(3t) + 7cos(nt) (b) 7 cos(nt)+ 5sin(2nt) (c) 3 cos(vZt) +5 cos(2t) (d) Sin) + 3 cos () + 3sin; + 30°)

A. Simplify the Circuit 1. B. Implement the simplified circuit of number 1.

A. Find a11. Express your answer using three significant figures. B. Find a12 . Express your answer using three significant figures and include the appropriate units C. Find a21 . Express your answer using three significant figures and include the appropriate units D. Find a22 . Express your answer using three significant figures and include the appropriate units

A cube of ice is 2 ft by 2 ft by 2 ft. The ice melts until it becomes a cube which is % as heavy as the original. Find the dimensions of the new cube.