Recent content by nnj

If our sun is the source of illumination, how can an object be observed from the Earth at full phase? Wouldn't the Earth eclipse the object? So then why can we see a full moon during full phase? Is it because the moon's orbit is inclined wrt to the Earth-Sun orbit? If so then wouldn't this by...

When looking for frequencies of normal modes in coupled oscillators, one can obtain a so-called secular equation given enough information. Why call this a secular equation? What is secular about it?

I don't understand why a change in current direction is necessary. If I run a current so that the effective N pole of the solenoid points in the +z direction and place a magnet above it with the N pole pointing in the -z direction, a switch in current direction would switch the direction of the...

Is it possible to use a solenoid as a shock absorber? i.e run current through the solenoid, producing a magnetic field opposing a separate magnet attached to whatever it is receiving the shock impulse, thus dampening the effect according to the amount of current input.