/sci/ - Science & Math

I have 2 stupid, basic physics questions which are surprisingly hard to find an answer to.

1) I have a table on the ground, with a cup on top, and the gorund vibrates. The vibrations must travel up the table legs to shake the coffee cup on top of the table. What cartesian axis are the vibrations travelling in? Is it z (up the leg) only? Is it planar vibration in x and y? Is it the same as the gorund vibration? If I stomp on the ground, what direction are the vibrations travelling in?

2) If I have a coil of wires (solenoid) with an iron core, and I pass a current through, what is the time it takes to establish a magnetic field in my core (from 0 current)? Is it the same speed as the current travelling through my wires, i.e. close to light speed? Does reluctance not inhibit this speed in some way?