Atimber beam consists of three 50 x 200 mm planks fastenedtogether
to form an i-beam 200 mm wide x 300 mm deep. if theflexural stress
of point a of the cross section is 7.5 mpa (intension),
determine:
a) the flexural stress at point b of the cross section.
b) the flexural stress at point c of the cross section.
c) the flexural stress at point d of the cross section.

The higher the astm grain size number, the finer the gran is. a)-true b)-false

Apure substance is a)-mixture of various chemical elements or compounds b)-substance that has a fixed chemical composition throughout c)-mixture that is homogeneous (such as air) d)-all the answers

Consider a 1.2 meter high and 2 meter wide glass window whose thickness is 6 mm and thermal conductivity is 0.78 w/m °c. the room temperature is maintained at 24 °c, while the outdoor temperature is -5 °c. the convective heat transfer coefficients on the inner and outer surfaces of the window are 10 w/m2 °c and 25 w/m2 °c respectively. (a) draw the thermal resistance network, etermine the steady rate of heat transfer t e glass window (c) determine the temperature of the inner surface of the window