Solve.
-The output voltage for an $\mathrm { AC }$ generator is approximated by $\mathrm { v } = 156 \cos \left( 120 \pi \mathrm { t } - \frac { \pi } { 3 } \right)$. Find the smallest positive value of $\mathrm { t }$ for which the output is 75 volts. Round values to 4 decimal places.
A) $0.0056$
B) $0.0046$
C) $0.0122$
D) $0.0112$

Question

Quizplus · Accepted Answer

The output voltage is 75 volts when $\cos \left( 120 \pi \mathrm { t } - \frac { \pi } { 3 } \right) = \frac { 75 } { 156 } \approx 0.4808$. Solving for $\mathrm { t }$ gives $\mathrm { t } \approx 0.0056$.

Solve -The Output Voltage for An \mathrm AC\mathrm { AC }AC

Solve
-The Output Voltage for An \mathrm $\mathrm { AC }$