, 12.11.2019 04:31, alexisdiaz365

# An object is dropped at a height of 12 m from the ground. how fast is it moving just before it hits the ground?

### Other questions on the subject: Physics

Physics, 21.06.2019 22:30, ari10184
Laser ablation is the process of removing material from a solid surface using laser radiation. one way of laser ablation is by heating up a thin surface layer of material over its melting point. assume the absorption of the incident laser power by a material creates a steadystate volumetric heat generation profile ďż˝789(ďż˝) = ďż˝=ďż˝? @â„a , where ďż˝ is the distance from the surface of the material, ďż˝= is a constant determined by the input laser power, and ďż˝ is another constant that characterizes the penetration depth of the laser power into the material. further assume the material thickness is ďż˝, and the temperature at the back surface of the material (ďż˝ = ďż˝) is maintained at ďż˝e, the environment temperature. the front surface of the material (ďż˝ = 0) is insulated to maximize the ablation efficiency. the thermal conductivity of the material is ďż˝. (a) obtain an expression of the steady-state temperature profile ďż˝(ďż˝) inside the material as a result of laser heating