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Find the norm of vector r prime of t when r(t) = t^2i + 2sintj + 2costk
 one year ago
 one year ago
Find the norm of vector r prime of t when r(t) = t^2i + 2sintj + 2costk
 one year ago
 one year ago

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modphysnoobBest ResponseYou've already chosen the best response.1
r'(t)=? r(t) is given
 one year ago

modphysnoobBest ResponseYou've already chosen the best response.1
so start with taking derivative
 one year ago

modphysnoobBest ResponseYou've already chosen the best response.1
then square each component , add them
 one year ago

causingaruckus,eh?Best ResponseYou've already chosen the best response.0
\[\sqrt(4t^2 + 4\cos^2t + 4\sin^2t)\]
 one year ago

causingaruckus,eh?Best ResponseYou've already chosen the best response.0
What's the trig identity for cos and sin?
 one year ago

modphysnoobBest ResponseYou've already chosen the best response.1
cos^2 t + sin^2 t =1
 one year ago

causingaruckus,eh?Best ResponseYou've already chosen the best response.0
so does the second half of that just become 8?
 one year ago

causingaruckus,eh?Best ResponseYou've already chosen the best response.0
Can you explain? I can never follow this one...
 one year ago

modphysnoobBest ResponseYou've already chosen the best response.1
cos(t)^2+sin(t)^2=1 4(cos(t)^2+sin(t)^2)=4
 one year ago

causingaruckus,eh?Best ResponseYou've already chosen the best response.0
Ohhhh.... Is that technically combining like terms?
 one year ago
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