Recent content by delta_simon

What is the status of current quantum computers? I mean, are there any working examples? What can they calculate so far?

Why would the radius classically be zero? I mean it´s just matter squezed tight together? Would the gravity eliminate all neutrons into a single point?

Does a black hole have a radius or is it zero? I don't mean the event horizon, but the matter that have been squized down forming the black hole.

About what is the value of the acceleration of gravity in low Earth orbit? <9,8m/s² ?

Homework Statement mass=m length=l initialspeed=v0 magneticfield=B Resistor=R Homework Equations A metal rod of mass m and length l slides on two parallell frictionless rails. A uniform magnetic field is directed perpendicular to the plane of the rails. There is no external agent...

How do I calculate Earth's magnetic field at a distance x from Earth's surface? Do I have have to think about Earth as a dipole and use the rate at the dipole weakens?