30) The function for a current is I(t) = 9 cos(120t) where / is the current,...

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30) The function for a current is I(t) = 9 cos(120t) where / is the current, in amperes, and t is the time in seconds. a) Find the current when t = 6 s. b) The electromotive force, E(t), in a circuit, is given in volts by finding the first derivative of the current function /(t). Find the function for the electromotive force E(t). c) Determine the electromotive force when t = 3. d) Find the maximum and minimum electromotive forces and the times that they occur. 30) The function for a current is I(t) = 9 cos(120t) where / is the current, in amperes, and t is the time in seconds. a) Find the current when t = 6 s. b) The electromotive force, E(t), in a circuit, is given in volts by finding the first derivative of the current function /(t). Find the function for the electromotive force E(t). c) Determine the electromotive force when t = 3. d) Find the maximum and minimum electromotive forces and the times that they occur.

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a To find the current when t 6s we substitute t 6 into the current function It I6 9 cos120 6 I6 9 co... View the full answer