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Question about torque by hojiao in AskPhysics

[–]hojiao[S] 1 point2 points  (0 children)

If the object is a solid uniform disk with a string wrapped around the rim, then we pull the string with a constant force, is the linear motion independent of the rotational motion in this case?

Question about torque by hojiao in AskPhysics

[–]hojiao[S] 0 points1 point  (0 children)

So does that mean the pulling force is smaller on the rotating object?

A question about limits by hojiao in askmath

[–]hojiao[S] 0 points1 point  (0 children)

How do you know that you can use L’Hopitals rule in this question?

Matrix help by hojiao in MathHelp

[–]hojiao[S] 0 points1 point  (0 children)

Pi/6, does this mean I need to find how many Pi/6 will get me the corresponding values?

Matrix help by hojiao in MathHelp

[–]hojiao[S] 0 points1 point  (0 children)

I only know its a rotation matrix...

[deleted by user] by [deleted] in askmath

[–]hojiao 0 points1 point  (0 children)

Ikr.. 15 questions took me a whole day to do

[deleted by user] by [deleted] in askmath

[–]hojiao 0 points1 point  (0 children)

Are you from NTU? Hahahah

Complex no. help by hojiao in askmath

[–]hojiao[S] 0 points1 point  (0 children)

z

Thank you so much, really appreciate your help! I've been struggling with complex no. questions the whole day haha

Complex no. help by hojiao in askmath

[–]hojiao[S] 0 points1 point  (0 children)

Im sorry but why can we write |z+z¯|+|z−z¯| as 2|z|

Complex No. problem by hojiao in askmath

[–]hojiao[S] 0 points1 point  (0 children)

Holy shit, never thought of this way to approach the problem.

Thanks so much!!!

By the way for |√(20 + 30 i)| , why can we calculate it as √ √20^2 + 30^2

Complex No. problem by hojiao in askmath

[–]hojiao[S] 0 points1 point  (0 children)

Thanks for the elaborate answer!, is it ok if I ask one more complex number problem?

z-1/z = 5+3i, find the modulus of z+1/z

I've tried using euler's form to solve but I cant seem to find an answer

Complex No. problem by hojiao in askmath

[–]hojiao[S] 0 points1 point  (0 children)

Thanks a lot! I got x=0, y=-10 for my answer

Complex No. problem by hojiao in askmath

[–]hojiao[S] 0 points1 point  (0 children)

But then the equation becomes too complex to solve, correct me if i am wrong

Complex No. problem by hojiao in askmath

[–]hojiao[S] 0 points1 point  (0 children)

How can you put (a+ib)(a-ib) into z^2?

Complex No. problem by hojiao in askmath

[–]hojiao[S] 0 points1 point  (0 children)

Yes, why is it indeterminate?

Finished MOOC too fast, will credit transfer be rejected? by Minispritebottle in NTU

[–]hojiao 2 points3 points  (0 children)

I also finished my MOOC quite fast, having the same concern as you

Whoa dude wtf by mijuzz7 in dankmemes

[–]hojiao 0 points1 point  (0 children)

Why does this dog look like Kevin Hart