The top of a thick acrylic testing box is covered with an unknown 0.16 inch insulation material. The dimensions of box are 10 inch x 10 inch on each side. The sides and bottom and are wrapped with a control insulting material (assume no heat is lost from the bottom or sides of the box). Determine the thermal conductivity for the top material if a 37 W bulb is used to heat the box. You may assume the only heat loss from the box occurs through the 10 x 10 test area. The bulb maintains the inside temperature at 13 ºC higher than the outside temperature.
Final unit should be J/s m C
1 inch = 2.54cm
