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Mathematics
Mathematics
Problem
The helix
r
(
t
)
=
⟨
5
cos
t
,
5
sin
t
,
c
t
⟩
\mathbf r(t)=\langle 5\cos t,\,5\sin t,\,ct\rangle
r
(
t
)
=
⟨
5
cos
t
,
5
sin
t
,
c
t
⟩
is traced for
0
≤
t
≤
2
π
0\le t\le 2\pi
0
≤
t
≤
2
π
, where
c
c
c
is a positive constant. Determine the value of
c
c
c
such that the length of the helix over this interval is
40
π
40\pi
40
π
.
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