Author Question: A double-paned window consists of two 60.0 cm 100 cm glass panes, 2.00 mm thick, separated by a ... (Read 43 times)

lb_gilbert · **on:** Jul 29, 2018

A double-paned window consists of two 60.0 cm 100 cm glass panes, 2.00 mm thick, separated by a 1.50 cm layer of still air. 25.0 W of heat flow through the window.

What is the temperature difference between the indoors and outdoors? The thermal conductivity of glass is 0.840 W/(mK), and that of air is 0.0234 W/(mK). A) 27.6 K
B) 27.3 K
C) 26.9 K
D) 26.7 K
E) 26.3 K

Question 2

A nearsighted person has a far point that is 4.2 m from his eyes. What focal length lenses in diopters he must use in his contacts to allow him to focus on distant objects?

A) 0.48 diopters
B) -0.48 diopters
C) -0.36 diopters
D) -0.24 diopters
E) 0.24 diopters