7. A rectangular duct has an equivalent diameter of 280 mm. If the aspect ratio is  1.3, find the dimensions of rectangular duct. A. h = 322 mm x b = 247.69 mm C. h = 312 mm x b = 267.69 mm B. h = 342 mm x b = 277.69 mm D. h = 385 mm x b = 747.69 mm

An engineer used a 30 m tape in measuring an inclined ground 459.20 m long. The difference between the starting point and end point is 1.20 m. The tape is of standard length at a temperature of 100 C and a pull of 50 N. During measurement the temperature reading was 15 0 C and a pull of 75N applied at both ends. A= 6.5mm2 ; E = 200GPa; K = 0.0000116 m/C0 . The mass of the tape is 0.075kg/m. Determine the horizontal distance.