Asharp through crack in a relatively large thick plate is 25 mm long. the plate is subjected to uniform uniaxial stress distributed along two opposite edges of the plate and acting perpendicular to the crack faces. the plate material’s mode i fracture toughness is reported to be 50 mpa-m1/2. at what stress value would you expect the crack to propagate rapidly, to complete fracture?

a. 78mpa
b. 6mpa
c.252 mpa

What precautions should you take to prevent injuries when dealing with heavy loads?

Derive the correction factor formula for conical nozzle i=-(1+ cosa) and calculate the nozzle angle correction factor for a nozzle whose divergence hal-fangle is 13 (hint: assume that all the mass flow originates at the apex of the cone.

Along 8-cm diameter steam pipe whose external surface temperature is 900c connects two buildings. the pipe is exposed to ambient air at 70c with a wind speed of 50 km/hr blowing across the pipe. determine the heat loss from the pipe per unit length. (b) air at 500c enters a section of a rectangular duct (15 cm x 20 cm) at an average velocity of 7 m/s. if the walls of the duct are maintained at 100c. a) the length of the tube for an exit temperature of the air to be 40 0c. b)the rate of heat transfer from the air. c) the fan power needed to overcome the pressure drop in this section of the duct.