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) \(\frac { 1 } { 168 } \mathrm { sec }\)

---

Definitions:

Replications

Repeating experiments or studies to ensure the results are consistent and reliable.

Null Hypothesis

A hypothesis that there is no significant difference or effect.

Alternative Hypothesis

In hypothesis testing, the hypothesis that proposes a difference or effect, contrasting the null hypothesis.

Interaction

The effect of two or more variables combined that is different from the effect of the variables individually.