小弟工數神爛 所以請想問板上的神人大大們...怎麼計算這幾題
Suppose
r(t) is a differentiable vector function for which
r(t) = c
for all t. Show that
r'(t) is perpendicular to r(t) for all t.
還有這題..
r(t) = (3cos t)i + (3sin t)j + (t/4)k ,
t ≧0 , is the position vector of a moving particle. Find the
velocity, speed, acceleration, unit tangent vector, unit normal vector and
curvature.
非常謝謝大大們
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