1. A signal given by x(t)=2cos(3pi t) is sampled at a frequency of 20 Hz, starting at time t=0. i. Is the signal sampled frequently enough? Why.
ii. Find the first six samples of the sequence.
111. Add delay to the sampled signal given in (b) by four samples. Draw the new one.

An electric motor is used to drive a power press which makes steel turning moment diagrams 323 pressings from a metal sheet. the motor runs at a mean speed of 50 rev/s. the torque required is 10.0nm for 0.2s, followed by 1.0nm for0.3 s with this sequence then being repeated. what is the minimum power required of the motor and the moment of incrtia required for the t1ywhcel if the speed fluctuations are to be restricted to 1.5%?