2.74 The mast is subjected to the three forces shown. Determine the coordinate direction angles a, b,y A1, B1, Y1 of F1 so that the resultant force acting on the
mast is FR = 350 i N.

2.91 Determine the magnitude and coordinate direction angles of the resultant

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