Laser vision correction often uses an excimer laser that produces 193-nm electromagnetic radiation. This wavelength is extremely strongly absorbed by the cornea and ablates it in a manner that reshapes the cornea to correct vision defects. Explain how the strong absorption helps concentrate the energy in a thin layer and thus give greater accuracy in shaping the cornea. Also explain how this strong absorption limits damage to the lens and retina of the eye.
A glider slides down a frictionless air track. What is the direction of the net force on the glider A D B E. None of the above C Now you push the glider up the track, giving it an initial uphill velocity, then remove your hand. It then slides up a frictionless air track. What now is the direction of the net force on the glider A D E. None of the above B C Friction N Rolling fr=µrN v FG Static Kinetic N fs≤ µsN N a=0 FG fk= µkN T a FG F⃗push You can push horizontally with a force of magnitude at most 500N. Can you move a 100kg box across a surface that has µs=0.75 and µ =k.45 Y ou can approximate g=10m/s . 2 (a) Yes (b) No (c) Only if someone helps you get started (d) Does my force have to be horizontal (e) I don’t know A 100kg box sits on the back of a ﬂat bed truck. The truck accelerates to the right (at 2m/s ), and the box doesn’t slip. What frictional force, if an