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Example 7 If the instantaneous voltage in an electric current is given by E = 102 sin
1840t, where E is expressed in volts and 't' is in seconds, find E if t = 0.10 seconds.
Solution
Example 8 The displacement (x) along the x-axis from the centre, at the end of a bob of a
pendulum is given by x = A sin 2pt. Find 'A' if d = 20 and t = 3.25.
Solution
x = A sin 2 p t = A sin (2 p . 3.25)
\ 20 = A sin (20.42) \ 20 = A. (1)
\ A = 20 (calculated in radian mode of calculator).
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