Solve the Problem $s ( t ) = - 3 \cos 7 t$

question 25

Multiple Choice

Solve the problem.
-The position of a weight attached to a spring is $s ( t ) = - 3 \cos 7 t$ inches after $t$ seconds. What are the frequency and period of the system?

• A) Frequency \(= 7\) cycles per sec, period \(= \frac { 1 } { 7 } \mathrm { sec }\)
• B) Frequency \(= \frac { 7 } { \pi }\) cycles per sec, period \(= \frac { \pi } { 7 } \mathrm { sec }\)
• C) Frequency \(= \frac { 7 } { 2 \pi }\) cycles per sec, period \(= \frac { 2 \pi } { 7 } \mathrm { sec }\)
• D) Frequency \(= \frac { \pi } { 7 }\) cycles per sec, period \(= \frac { 7 } { \pi } \mathrm { sec }\)

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