Awall in a house contains a single window. the window consists of a single pane of glass whose area is 0.17 m2 and whose thickness is 2.3 mm. treat the wall as a slab of the insulating material styrofoam whose area and thickness are 15.00 m2 and 0.080 m, respectively. heat is lost via conduction through the wall and the window. the temperature difference between the inside and outside is the same for the wall and the window. of the total heat lost by the wall and the window, what is the percentage lost by the window? (the thermal conductivity for glass window is kg = 0.80 j/(s·m·c°), and the thermal conductivity for styrofoam is ks = 0.010 j/(s·m·c°

96.93%

Explanation: The basic equation for the rate of steady conduction heat transfer is called Fourier's Law of Conduction.

Mathematically:

where:

In this question we have two materials through which heat transfer occurs through a wall, one is the Styrofoam of which the wall is made and the other is the glass pane of window.

According to the language of question we consider that we are given the area of Styrofoam after removing the area of glass window pane on it, otherwise we would subtract the area of glass pane from the area of wall.

Given data:

Heat transfer through the glass pane of window:

Putting the given values in Fourier's eqn.

Heat transfer through the Styrofoam wall:

Total heat transfer 'q':

q= 61.005(dT) W

Now,

% of Heat lost by window=

=96.93%

potential energy is directly proportional to height.

more height = more potential energy.

greatest increase in height = greatest increase in potential energy

where are the points with the greatest increase in height ?

has to be c-e or d-e .