Acantilever of length 0.5 m and square cross-section of sides 50 mm is subjected to a downward-acting alternating end load. the static tensileield s for completely reversed stress of the material are(300 ? if the mean stress ? m-30 mpa, using the soderberg-equation. and f a. an determine the maximum and minimum values of the end load. also show stress-time variation curve (sinusoidal).

Apreheater involves the use of condensing steam at 100°c on the inside of a bank of tubes to heat air that enters at 1 atm and 25°c. the air moves at 5 m/s in cross flow over the tubes. each tube is 1 m long and has an outside diameter of 10 mm. what is the minimum value of nl needed to achieve an outlet temperature of t 75 c? what is the corresponding pressure drop across the tube bank?