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Old Dec 5th 2009, 03:40 PM   #1
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position of cart !

The position of a an air-track cart that is oscillating on a spring is given by (18.0cm)cos[(18.0s^-1)t].
At what value t after t=0 is the cart first located at x=14.6 cm?
Hint: Make sure your calculator is in radian mode.

i've tried

14.6 cm = (18.0cm)cos[(18.0s^-1)t
t= 14.6/[(18.0cm)cos[(18.0s^-1)]
= 0.54

but its wrong.
what did i do wrong?

Last edited by christina; Dec 5th 2009 at 03:55 PM.
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Old Dec 6th 2009, 10:50 AM   #2
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This is correct :

14.6 cm = (18.0cm)cos[(18.0s^-1)t

Find t ...

What's s^-1 ?
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Old Dec 6th 2009, 05:49 PM   #3
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thats how i got 0.54
but apparently its not correct answer...
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Old Dec 8th 2009, 07:25 AM   #4
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can someone point me out what i did wrong please? hmmmm
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Old Dec 8th 2009, 08:59 AM   #5
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everything is ok. but your calculator is not!!
1/18 cos inverse (14.6/18)=0.0347 seconds

Last edited by r.samanta; Dec 8th 2009 at 10:02 AM.
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