1. The problem statement, all variables and given/known data I have the last 3 parts of this question to answer and I'm struggling with it and would appreciate any advice please or if what i have done is correct thanks. 2. Relevant equations 3. The attempt at a solution Q1. The time to reach the greatest voltage rate of change A. dv/dt =(2 x 10^4pi) cos (200pi t + pi/4) maximum occurs when dv/dt = 0 and d^2v/dt^2 is negative d^2v/dt^2 = -(4 x 10^6 pi^2) sin (200pi t + pi/4) cos (200pi t + pi/4) = 0 when t = 0 and when t = 0 d^2v/dt^2 is negative When t = 0 v = 100 as sin(200pi t +pi/t = 1 Q2. The value of the greatest voltage rate of change dv/dt is maximum when cos (200pi t +pi/4) is either 1 or -1 which occurs when 200pi t + pi/4 = 0 or pi radians t is either = 1/800 or 1/800 seconds i.e. t = -0.00125 or 0.00125 seconds Q3. Using integral calculus, calculate the RMS value sketch a graph to visualise the process ?