A compound pulley system with seven supporting strands is used to lift heavy crates. The motor being used to wind the cable in the pulley system can provide 215 lb of force. What
is the ideal mechanical advantage of the system? (Write this as just a number, not a ratio)

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