Assuming the two lasers have identical characteristics and power output except their wavelength, which one would be more successful and easy in cutting clear glass?
In case there is doubt that you can even cut clear glass with a laser, see here these two video demonstrations:
Visible spectrum blu...
As shown in the diagram, a long rod has ends A and B, a spaceship is at A. A, B and the spaceship all have clocks attached to them. The clocks are then synchronized to time $t_0$, and immediately The spaceship flies with velocity $u$ relative to the rod from A to B.
Suppose relative to the rod, ...
Backup Room – The h Bar
The old Usenet Physics FAQ, is a page originally by Matt Austern, says that
all protons have identical rest masses, and so do all electrons, and so do all neutrons; these masses can be looked up in a table. As the particle is accelerated to ever higher speeds, its relativistic mass increases w...
From here I learn that, if Pauli vector is defined as $\boldsymbol\sigma=\sigma_\alpha\hat x_\alpha$, and $\boldsymbol a$ denotes a vector, whose components are all numbers, not matrices, then
$$\det(\boldsymbol{a}\cdot\boldsymbol{\sigma})=-\boldsymbol a\cdot\boldsymbol a$$
That website proves ...