Recent content by stellaman

You need the friction arrow. Imagine if there was no friction between the two blocks, B would slide out from A and A would stay in the exact same place. So friction must be keeping A on top of B.

You have 2 different parts. At rest and moving, aka before and after, aka primed and unprimed.

Homework Statement What is the relative speed if two observers record a time difference of 1% Homework Equations t=(gamma)t' The Attempt at a Solution I use the above equation and solved for v, and got v=sqrt(-c2((t'/t)2-1) however I am gettin 2.999x108m/s, and I am pretty...

Homework Statement A star surrounded by a sphere of dust with a radius R. The star emits a short bright flash of light, it is absorbed and re-emitted by the dust. Someone much further away than R sees the light, first at a point on the shell and then in an expanding ring. A)Show that the...