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Hey so if i'm using like a D size battery, how big is my coil suppose to be??? size of a glue stick lid??? tips anyone and also how many turns :)

and where would i get this, and if i had to buy it how much?

cough*

Instead of copper, what other material can i make into a coil, and are there any advantage and disadvantage for not using copper????

Hey i'm making a DC motor, and wonder how many turns should i make.... note that i did 10 and it didn't work, i don't no whether it was to many or less :S thx! :)

Hey i just wanted to know, people who built a motor or generator in the past year what trouble you seem or have to have face, and wanting to know like a better solution (what to avoid and such) to build a motor or generator :)

i think you got it right :), but you seem to skip some step, slow person, can you show the full working out

aswner for a is -cosx + 1/3cos^3 x

huh, its x^3, y no 1/3cos3^ x

my bad, its integrating it

anyone :S

a) sin^3 x b) sin^2 x^o (degree)

is it suppose to be 3/2(4/5cos4x/5-x)+c??? or like above, if so why do you flip the 4/5??? I understand now, got it :)p

Qb is easy :) Can someone show me the working out for a) thanks!

Primitive function of a) 3sin^2 2x/5 b) sin^3 xdx <---- use substitution right???

thanks you! poeople!!

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some friends said that the net speed is fine

been there, need more info :)