A double-paned window consists of two 60.0 cm 100 cm glass ...

[lb_gilbert]

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

[cuttiesgirl16]

Answer to Question 1

C

Answer to Question 2

D

[lb_gilbert]

Excellent

[31809pancho]

TYSM