A double-pane insulated window unit consists of two 1-cm-thick pieces of glass separated by a 1.8-cm layer of air. The unit measures 4 m in width and is 3 m wide. Under conditions where the extreme outside temperature of the glass is at −10∘C and air, at 27∘ C, is adjacent to the inside glass surface, with hi=12W/m2⋅K, determinea. the inside glass surface temperatureb. the rate of heat transfer through the window unitThe air gap between glass panes may be treated as a purely conductive layer with k=0.0262W/m⋅K. Thermal radiation is to be neglected.

Astudent is performing an experiment comparing sound and light waves. the student gathers the following data. what conclusion does the student most likely make based on this data? light waves always travel the same speed; however, the speed of sound is determined by the medium that it travels through. all sound waves always have the same energy, so the temperature of the medium does not affect wave speed. light needs to vibrate particles, so it travels fastest in tightly packed solids, while sound does not need a medium, so it travels fastest in a gas. tightly packed particles in solids slow down the light waves; however, sound waves make particles bounce into each other, so they travel faster in solids.

Positrons are spontaneously emitted from the nuclei of

Which of the following are appropriate acceleration units?