anilorap
let r(t)=(sint, cost,t) find k(t)



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anilorap
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k(t)=r'(t)xr''(t) / r'(t)^3

anilorap
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r'(t)= (cost,sint,1)
r''(t)=(sint,cost,0)
r'(t)= square root of 2

ash2326
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r'(t)r''(t)=(sint cost, sint cost, 0)
r'(t)r''(t)=root(sin^2t cos^2t+sin^2t cos^2+0)
r'(t)r''(t)=root(2 sint^2t cos^2t)=sint.cost root(2)
r't^3=2root (2)
k(t)=(sint*cos t)/2

anilorap
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mm,,, in the cross product i got
(cost, sint,1)

him1618
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dT/dt x 1/v

him1618
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T = v(t)/v(t)

mathmate
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r(t)=(sint, cost,t) find k(t)
r'(t)=<cos(t),sin(t),1>
r"(t)=<sin(t),cos(t),0>
r'(t)xr"(t) = <cos(t),sin(t),1>
r'(t)xr"(t) = sqrt(2)
r'(t) = sqrt(2)
r'(t)xr"(t) / r'(t)^3 = sqrt(2)/sqrt(2)^3 = 1/2

anilorap
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yea thats what i have

mathmate
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Great!