# Search results

1. ### Proving the cartesian product.

@SteveL27 it's the equality that i'm trying to prove. that |A X B| = |A| * |B|. @vrmuth i also don't know much about the successor function. it's just one of the requirement of http://en.wikipedia.org/wiki/Peano_axioms" [Broken] i will look more into that function and retry the proof.
2. ### Proving the cartesian product.

hello all, i'm trying to prove the cartesian product cardinality property of the cartesian product. on a first attempt i used this: and on a second attempt this: this is the first of many small exercises i'm doing for building a strong theoretical computer science background. i...
3. ### Direction of a particle in a uniform magnetic field.

thanks a lot for the reply.
4. ### Direction of a particle in a uniform magnetic field.

Homework Statement a beam of particles with velocity v^vector enters a region that has a uniform magnetic field B^vector in the +x direction. show that when the x component of the displacement of one of the particles is 2 * Pi * (m / qB) * vcos(theta), where theta is the angle between...
5. ### Conservation of mechanical energy

Thanks a lot, I see it clearly now. I really appreciate you help.
6. ### Conservation of mechanical energy

Homework Statement I have two blocks attached by a string (massless) over a pulley (frictionless, massless). Block 2 (which weighs less than block one) is released and the two blocks meet momentarily at the same height. I have the find the speed at which the meet at that moment. The blocks...

College :)
8. ### Incline plane + friction

vishal_garg, thank you so much :D I spent the whole night banging my head again my desk trying to figure out what I was doing wrong... Thanks for all replies
9. ### Incline plane + friction

Homework Statement In the figure (sorry for that quick drawing with paint) m_1 (first block) = 4.0kg, m_2 = 5.0kg and the coefficient of kinetic friction between the incline plane and the first block is \mu_k = 0.24. Incline = 30 degree with horizontal Find the magnitude of the...