The wall has dimensions of 100 ft x 10 ft including window and door areas. The wall has a total window area of 80 ft2 and a door (8 ft x 2.5ft). The heat-transfer coefficients are 0.2 Btu/hr-ft2 –F for wall, 0.1 Btu/hr-ft2 –F for window, and 0.1 Btu/hr-ft2 –F for door. Determine the effective overall heat-transfer coefficient for the combination, U

Aflywheel accelerates for 5 seconds at 2 rad/s2 from a speed of 20 rpm. determine the total number of revolutions of the flywheel during the period of its acceleration. a.5.65 b.8.43 c. 723 d.6.86

Adouble-strand no. 60 roller chain is used to transmit power between a 13-tooth driving sprocket rotating at 300 rev/min and a 52-tooth driven sprocket. a) what is the allowable horsepower of this drive? b) estimate the center-to-center distance if the chain length is 82 pitches. c) estimate the torque and bending force on the driving shaft by the chain if the actual horsepower transmitted is 30 percent less than the corrected (allowable) power.

Thermal stresses are developed in a metal when its a) initial temperature is changed b) final temperature is changed c) density is changed d) thermal deformation is prevented e) expansion is prevented f) contraction is prevented