Q1) An oscillating signal voltage is given by E=125cos(wt-&)millivolts, where the angular frequency is w=123pi,phase angle is &=pi/2,and t= time in seconds. The triggering mechanism of an oscilloscope starts the sweep when E= 60mV. what is the smallest postive value of t for which the triggering occurs?

Q2)The displacement d of a piston is given by

d=sinwt+1/2sin2wt