The instantaneous value of current, i amp, at t seconds is given by:

i = 15 sin(100pi t +0.6)

Find the value of

a) the amplitude

b) the period

c) the frequency

d) the initial phase angle (when t=0), expressed in both radians and degrees

e) the value of i when t =2.5s

f) the time (in milliseconds) when current first reaches its maximum value