Statics: Lesson 10 - Directional Cosines for 3D Vectors and Components

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[ambrose_]

You are the funniest and best physics teacher ive ever had the chance to learn from. Thank you Jeff!

[cpt_schaner]

Thank you Jeff. Helping here in Michigan. You make content so easy and digestible compared to most. You're appreciated.

[kymxvri]

you are so good. Excellent sense of humor as well🤣🤣🤣

[JetteroHeller]

For anyone following along, theta z works out to be 120 deg. cos inv of 0.5 = 60 or pi/3. pi/3 + pi/3 = 2 pi/3 or 120 deg.

[di]

Wow, these lectures are a gift. Thank you so much!!!

[LourdIschan]

I am no longer Johnny weak sauce :D thank you Dr Hanson!

[mohammadrohankhan]

U make it look so easy.. best explanation

[georgesadler]

Professor Hanson, thank you for another great lecture on Directional Cosines for 3D Vectors and Components. Directional Cosines are also part of Calculus Three. I am very familiar with Directional Cosines from Calculus Three( Multivariable Calculus).

[aungyeoo]

Amazing Mr.Jeff, every single video....

[JordanTaylorVideos]

Why is the angle coming off of the y-axis to vector F1 not -60 degrees? It's going clockwise.

[MCGUIANG]

Thank you Dr. Jeff, you help me to underatend these lessons.

[supernova]

But at 8:30, and in general, don't we take the counter clockwise and clockwise directions into consideration?? The angle from positive Z to vector F1 is clockwise. Can these angles ever be negative? Its the same thing for thetta y..its clockwise, doesn't that mean it should be negative?

[prithvinayak]

At, 7:30 shouldn't Thita Y be negative 60?

[wahkilla]

Why do I keep getting 60 deg for theta z? Isn't it supposed to be larger than 90 deg coming from the pos z axis? help

[abdulmajeedhamid]

😂😂😂😂😂😂 oh my god when he Mentions Johnny week he kills my Laughing

[goldenspark]

Yeeehhah

We getting an A with This

[danmog]

Can somebody please name the associated textbook with this course? for solving problems.

[johncaligan]

Did you delete the other video of this lesson Dr?

[tutstorial]

sir, what if I got a negative summation of Fx

to find theta x, should i use arccos negative fx/f or the positive fx??

[nimcaandayib]

Dear teacher please where came from 100i, 200j and -30k????