Solve the Problem $\mathrm { I } = 40 \sin 28 \pi \mathrm { t }$

question 218

Multiple Choice

Solve the problem.
-A generator produces an alternating current according to the equation $\mathrm { I } = 40 \sin 28 \pi \mathrm { t }$ , where $\mathrm { t }$ is time in seconds and $\mathrm { I }$ is the current in amperes. What is the smallest time $t$ such that $\mathrm { I } = 20$ ?

• A) \(\frac { 1 } { 112 } \mathrm { sec }\)
• B) \(\frac { 1 } { 56 } \mathrm { sec }\)
• C) \(\frac { 1 } { 84 } \mathrm { sec }\)
• D) \(\frac { 1 } { 168 } \mathrm { sec }\)

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