Nathan J.

asked • 06/24/22

Find Unit Tangent and Normal Vectors

Find →T→ and →N→ for the curve r(t)=⟨3cos(3t), 3sin(3t), 5t⟩ at the point t=0


Give your answers to two decimal places

1 Expert Answer

By:

Johnny M. answered • 06/24/22

Tutor
5 (10)

Calculus Teacher

Nathan J.

Thank you for the video, it was super helpful. Although, the answer for the tangent vector doesn't seem to be right. I have reworked it a few times and have gotten the same results. For my homework software, it wants me to give my answer to 2 decimal places. I have distributed the 1/rad 34 and inputted the following. [0, 3/rad34, 5/rad34] and this was wrong. Any thoughts?
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06/26/22

Johnny M.

tutor
Hi Nathan, the answer would be right, but we just need to enter it in the format your software is requesting. If they want decimals rounded to two decimal places, then this would be: T = < 0, 0.51, 0.86 > N = < -1, 0, 0 > Give that a try and let me know if that works for you!
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06/26/22

Nathan J.

I also tried that and it's still coming up as incorrect. I do not understand where I might be going wrong.
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06/26/22

Johnny M.

tutor
Could you try T = < 0, 0.87, 0.49 > and leave N = < -1, 0, 0 >. Let me know if this still doesn't work for you.
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06/26/22

Nathan J.

That did the trick. Thank you for the help. Seems like the computer software was being extra picky.
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06/27/22

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