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Mathematics
Mathematics
Problem
Let
r
(
t
)
\mathbf r(t)
r
(
t
)
denote the position of a moving particle. What geometric quantity is represented by
∣
r
′
(
t
)
∣
|\mathbf r'(t)|
∣
r
′
(
t
)
∣
at a given value of
t
t
t
?
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