A5.5-m-long simply supported timber beam carries two concentrated loads as shown. the cross-sectional dimensions of the beam are also shown. assume l1=1.1 m, l2=2.2m, p=10 kn, q=34 kn, a=135 mm, b=130 mm, c=90 mm, and d=475 mm. (a) at section a–a, determine the magnitude of the shear stress in the beam at point h. (b) at section a–a, determine the magnitude of the shear stress in the beam at point k. (c) determine the maximum horizontal shear stress that occurs in the beam at any location within the 5.5-m span length.(d) determine the maximum compression bending stress that occurs in the beam at any location within the 5.5-m span length.

Steel is coated with a thin layer of ceramic to protect against corrosion. what do you expect to happen to the coating when the temperature of the steel is increased significantly? explain.

Air is to be cooled in the evaporator section of a refrigerator by passing it over a bank of 0.8-cm-outer-diameter and 0.4-m-long tubes inside which the refrigerant is evaporating at -20°c. air approaches the tube bank in the normal direction at 0°c and 1 atm with a mean velocity of 4 m/s. the tubes are arranged in-line with longitudinal and transverse pitches of sl- st 1.5 cm. there are 30 rows in the flow direction with 15 tubes in each row. determine (a) the refrigeration capacity of this system and (b) pressure drop across the tube bank. evaluate the air properties at an assumed mean temperature of -5°c and 1 atm. is this a good assumption?

Aplate clutch has a single pair of mating friction surfaces 250-mm od by 175-mm id. the mean value of the coefficient of friction is 0.30, and the actuating force is 4 kn. a) find the maximum pressure and the torque capacity using the uniform-wear model. b) find the maximum pressure and the torque capacity using the uniform-pressure model.