Recent content by art.t

I wouldn't expect the CO2 temperature to have any useful effect on the heat of the beam unless you're expecting the increased density at cold temperatures will scatter the light more. The energy present in a beam of light radiation is the amount of photons times the energy per photon, which is...

Try lifting the center of mass of the hanging chain up on to the table and using the formula (work done against gravity = m*g*h). The center of mass is halfway down the part that's hanging off, which was L/3. So the center of mass is L/6 below the table top. The mass of the hanging part is...