In fact, I don't understand although I can deduce it.
The volume of sphere is (4/3)πR3, (πR2 x dz) = base area x height = volume of cylinder
Whether I got wrong about the picture is talking about the cylinder not sphere?
Thanks.
Thanks.
Yes, but why not |axb|, is |axb|(unit vector n) in third step?
absinΘ and |axbl are also magnitudes, but |axb|(unit vector n) is a vector. absinΘ = |axb| ≠ |axb|(unit vector n) = vector a x vector b.
However, here absinΘ = |axb|(unit vector n). I don't understand this.
On the other...