Solve the Problem $$\mathrm { I } ( \mathrm { t } ) = 40 \sin \left( 60 \pi t - \frac { \pi } { 2 } \right)$$

question 67

Multiple Choice

Solve the problem.
-The function $$\mathrm { I } ( \mathrm { t } ) = 40 \sin \left( 60 \pi t - \frac { \pi } { 2 } \right)$$ represents the amperes of current produced by an electric generator as a function of time t, where t is measured in seconds. Find the smallest value of t for which the current is 20 amperes. Round your answer to three decimal
Places, if necessary.

• A) 0.008
• B) 0.011
• C) 0.017
• D) 0.033

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