... At t= 1 the chair is closest to the wall and d(1) = 18cm . At t = 1.75s the chair is farthest from the wall and d (1.75) = 34cm. What is the period?

Is it 0.75s ? because the back of the book says 1.5s!

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- December 16th 2012, 02:58 PMsakonpure6Period of a Sinusoidal Function
... At t= 1 the chair is closest to the wall and d(1) = 18cm . At t = 1.75s the chair is farthest from the wall and d (1.75) = 34cm. What is the period?

Is it 0.75s ? because the back of the book says 1.5s! - December 16th 2012, 03:21 PMskeeterRe: Period of a Sinusoidal Function
I assume the chair moves from "close to the wall", then "far from the wall", then back "close to the wall" ... how much time to go from "close to the wall" back to "close to the wall" again?

that would be the period. - December 16th 2012, 03:43 PMsakonpure6Re: Period of a Sinusoidal Function
so o.75 seconds right?

- December 16th 2012, 03:58 PMskeeterRe: Period of a Sinusoidal Function
no ...

t(close to wall) = 1

t(far from wall) = 1.75

t(back to close to the wall) = ? - December 16th 2012, 04:07 PMsakonpure6Re: Period of a Sinusoidal Function
I don't get it... because let's assume that the at 0s it equals 18cm so it means that 0.75s it equals 34, which gives us a period of 0.75s ?!

- December 16th 2012, 04:09 PMskeeterRe: Period of a Sinusoidal Function
post the entire problem statement as it is presented to you, please.

- December 16th 2012, 04:21 PMsakonpure6Re: Period of a Sinusoidal Function
Megan is sitting in a rocking chair. The distance, d(t) between the wall and the rear of the chair varies sinusodally with time t. At t= 1s, the chair is closest to the wall and d(1)=18cm. At t=1.75s the chair is farthest from the wall and d(1.75)=34cm.

a) what is the period of the function? - December 16th 2012, 04:24 PMskeeterRe: Period of a Sinusoidal Function
period is the time it takes to go

**back and forth**one time ... that is called a complete cycle of motion.

.75 forth and .75 back = 1.5 seconds.